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Showing papers on "Laves phase published in 1988"


Journal ArticleDOI
Motoki Shiga1
TL;DR: In this paper, the conditions for the onset of Mn moments and the type of spin fluctuations of the Mn sublattice are discussed, and it is shown that the Mn moments, if they exist, are unstable and easily collapse on raising the temperature or on substituting R or Mn by a third element with a smaller atomic volume.
Abstract: The magnetism of Laves phase compounds RMn2 is reviewed. The conditions for the onset of Mn moments and the type of spin fluctuations of the Mn sublattice are discussed. It is shown that the Mn moments, if they exist, are unstable and easily collapse on raising the temperature or on substituting R or Mn by a third element with a smaller atomic volume. By analyzing the thermal expansion curves, the amplitudes of spin fluctuations in YMn2 and related compounds are estimated.

126 citations


Journal ArticleDOI
H. Yamada1
TL;DR: In this article, the magnetic properties of the transition metal compounds with the cubic MgCu2-type Laves phase structure are reviewed from the theoretical point of view, and the calculated results for the electronic structure of d-electrons in AB2 (A � Sc, Ti, Y, Zr, Nb, Lu and Hf and B  Mn, Fe, Co and Ni), which are carried out in the tight-binding approximation, are summarized.
Abstract: From the theoretical point of view, magnetic properties of the transition metal compounds with the cubic MgCu2-type Laves phase structure are reviewed. The calculated results for the electronic structure of d-electrons in transition metal compounds AB2 (A  Sc, Ti, Y, Zr, Nb, Lu and Hf and B  Mn, Fe, Co and Ni) with the cubic Laves phase structure, which are carried out in the tight-binding approximation, are summarised. Many interesting magnetic properties observed in these compounds are shown to be understood by the shape of the density of states curve around the Fermi level. It is explicitly shown that the hybridisation between the d-states of the A and B atoms in AB2 compounds is playing an important role in their magnetic properties.

94 citations


Journal ArticleDOI
TL;DR: In this paper, a reduced activation ferritic steel, 8Cr-2W-0.04Ta-Fe, was aged at 673-923 K. for up to 36 Ms, and Charpy impact tests and metallurgical investigation were conducted on the aged specimens.

87 citations


Journal ArticleDOI
TL;DR: In this paper, the magnetism and the stability of the crystal structure of the Laves phase compounds AB2 were investigated using the LMTO method within the framework of the LDS approximation, and the theoretical predictions about the stability and magnetism were in good agreement with the experimental results.
Abstract: To investigate the magnetism and the stability of the crystal structure of the Laves phase compounds AB2, the total energy was systematically calculated by the LMTO method within the framework of the LDS approximation. For the non-magnetic compounds the crystal structure is determined by the B atom: the stable structure is the C15 structure when the B atom is Cr, Co or Ni(Mo, Rh or Pd) and the C14 structure when the B atom is Mn or Fe (Tc or Ru). In the Fe Laves phase compounds AFe2 the electronic structures change slightly with a change in the lattice spacing, thus inducing a varied magnetic behaviour. The theoretical predictions about the stability of the crystal structure and the magnetism are in good agreement with the experimental results.

64 citations


Journal ArticleDOI
TL;DR: Magnetic susceptibility, thermal expansion and NMR have been measured for the pseudobinary Laves phase intermetallic compounds Y 1-xScxMn2 with x
Abstract: Magnetic susceptibility, thermal expansion and NMR have been measured for the pseudobinary Laves phase intermetallic compounds Y1-xScxMn2 with x

58 citations


Journal ArticleDOI
TL;DR: By hydrogenation of Laves phase RFe 2 compounds (where R is yttrium, samarium, gadolinium, terbium, dysprosium, holmium or erbium) between 450 and 550 K, it is possible to produce the amorphous alloys containing hydrogen as discussed by the authors.

57 citations


Journal ArticleDOI
TL;DR: In both the crystalline and the amorphous alloys the authors find an essentially free-electron-like density of states (DOS), but close to the Fermi level the DOS is enhanced due to the onset of Ca 3d states and there is no evidence for the existence of a structure-induced minimum in the DOS near ${E}_{F}$.
Abstract: Calculations of the atomic and electronic structure of Ca-Mg glasses and of the crystalline intermetallic compound ${\mathrm{CaMg}}_{2}$ are presented. For the glasses, the calculations are based on realistic models of the atomic structure constructed by a molecular-dynamics computer simulation linked to a steepest-descent potential-energy mapping. Interatomic forces are described in terms of pseudopotential-derived effective pair potentials. Our results for the atomic structure are in very good agreement with x-ray-diffraction data. They show that the topological short-range order in the glass is similar to the atomic arrangement in the crystalline Laves phase and best described as a highly defective tetrahedral close packing. The analogy between the glassy and the crystalline phases extends to the electronic structure. In both the crystalline and the amorphous alloys we find an essentially free-electron-like density of states (DOS), but close to the Fermi level the DOS is enhanced due to the onset of Ca 3d states. We find no evidence for the existence of a structure-induced minimum in the DOS near ${E}_{F}$. Our results are in good agreement with photoemission measurements and electronic specific-heat data.

50 citations


Patent
16 May 1988
TL;DR: A hydrogen storage electrode comprising a body of an alloy of the general formula, AB a, or a hydride thereof, in which A represents at least one element selected from the group consisting of Zr, Ti, Hf, Ta, Y, Ca, Mg, La, Ce, Pr, Mm, Nb, Nd, Mo, Al and Si as discussed by the authors, B represents a mixture of rare earth elements, and a is a value of from 1.0 to 2.5.
Abstract: A hydrogen storage electrode comprising a body of an alloy of the general formula, AB a , or a hydride thereof, in which A represents at least one element selected from the group consisting of Zr, Ti, Hf, Ta, Y, Ca, Mg, La, Ce, Pr, Mm, Nb, Nd, Mo, Al and Si, B represents at least one element selected from Ni, V, Cr, Mn, Fe, Co, Cu, Zn, Al, Si, Nb, Mo, W, Mg, Ca, Y, Ta, Pd, Ag, Au, Cd, In, Sn, Bi, La, Ce, Mm where Mm is a mixture of rare earth elements, Pr, Nd, Th and Sm provided that A and B are different from each other, and a is a value of from 1.0 to 2.5. The alloy has an alloy phase which is substantially a Laves phase of an intermetallic compound of A and B, and has a crystal structure of a hexegonally symmetric C14 type having crystal lattice constants, a and c, of from 4.8 to 5.2 angstroms and from 7.9 to 8.3 angstroms, respectively, and/or a cubically symmetric C15 type having a crystal lattice constant of from 6.92 to 7.70 angstroms. A method for making the electrode is also described using a sintering or non-sintering process.

48 citations


Journal ArticleDOI
TL;DR: In this paper, the structural transformation of RNi2 Laves phases (≡ La, Ce) on absorption of hydrogen and deuterium was studied using X-ray powder diffraction at room temperature, 90 and 120 °C and using time-resolved neutron powder diffusion at room-temperature.
Abstract: The structural transformation of RNi2 Laves phases (≡ La, Ce) on absorption of hydrogen and deuterium was studied using X-ray powder diffraction at room temperature, 90 and 120 °C and using time-resolved neutron powder diffraction at room temperature. For the intermetallic compounds, superlattice lines indexed in a double cubic cell are observed in addition to the diffraction peaks of the cubic C-15-type structure. In the case of in situ absorption measurements, small increases in the lattice parameters of the crystalline phases LaNi2.18 and CeNi2.16 are observed and the formation of an amorphous phase is detected from the first stage of the absorption. Under equilibrium conditions at room temperature, the lattice parameter of the crystalline phase LaNi2.18 increases as previously, whereas that of CeNi2.16 is found to decrease with increasing deuterium content. A mechanism for the segregation of the cerium atoms from CeNi2.16 leading to a compound rich in cerium vacancies and cerium hydride is proposed on the basis of the results of the high temperature (90 and 120 °C) hydrogen absorption experiments. The thermal desorption of the amorphous hydride CeNi2.16H3.65 (studied by neutron diffraction) leads to a recrystallization of the intermetallic compound CeNi2 + y after the formation of intermediate CeNix phases.

45 citations


Journal ArticleDOI
TL;DR: In this paper, it was shown that the true composition of this tetragonal phase (a = 7.355 A and c = 14.51 A ) is LaNi2.
Abstract: Seven alloys near the LaNi2 composition were studied by metallographie and X-ray techniques. Alloys that were cooled slowly were found to consist of two phases: from x = 1.75 to 2.25 and from x = 2.40 to 2.50, where x is the Ni:La ratio. A single-phase alloy was found near x = 2.30. A complete single-crystal structure analysis showed that the true composition of this tetragonal phase ( a = 7.355 A and c = 14.51 A ) is LaNi2.286. The space group is I42m and the unit cell contains 32 nickel atoms and 14 lanthanum atoms. This tetragonal structure is related to the cubic C15 Laves phase such that at ≈ ac and ct ≈ 2ac and two lanthanum atoms are removed from the tetragonal structure. The formation of this phase is thought to result from the large disparity between the lanthanum and nickel radii ( r La r Ni = 1.506 ) relative to that expected for the ideal constituent atoms of the AB2 cubic Laves phase ( r A r B = 1.225 ), which prevents the formation of the ideal C15 Laves phase.

43 citations


Journal ArticleDOI
TL;DR: In this article, very unusual magnetic structures are stabilized with large crystallographic distortion, due to the tetrahedral arrangement of the Mn atoms in the Laves phases, the magnetic structures of the RMn2 are frustrated.
Abstract: Because of the tetrahedral arrangement of the Mn atoms in the Laves phases, the magnetic structures of the RMn2 are frustrated. To reduce this frustration, very unusual magnetic structures are stabilized with large crystallographic distortion.

Journal ArticleDOI
TL;DR: It is suggested that hybridization effects, presumably in the main part between the 3d iron and 5f plutonium electrons, play a significant role in modifying the spin and orbital contributions that give rise to the unusual Pu form factor.
Abstract: Neutron diffraction experiments using both polarized and unpolarized beams have been performed on a small (40 mg) single crystal of /sup 239/PuFe/sub 2/ This material has the cubic Laves phase structure and is ferromagnetic at approx560 K The polarized-neutron experiments have shown that (a) the easy direction for both the Pu and Fe moments is , (b) the moments are (039 +- 002)mu/sub B/ and (173 +- 001)mu/sub B/ for the Pu and Fe atoms, respectively, (c) the Fe form factor is the same as in iron metal, and (d) the form factor of Pu is very unusual The Pu form factor is very different from that found recently in PuSb and cannot be analyzed with a straightforward crystal-field ground state We suggest that hybridization effects, presumably in the main part between the 3d iron and 5f plutonium electrons, play a significant role in modifying the spin and orbital contributions that give rise to the unusual Pu form factor

Journal ArticleDOI
TL;DR: In this article, the susceptibility to embrittlement during thermal ageing of the three classes of steel discussed is determined by the concentration of impurities, notably phosphorus, which is due to microstructural changes during heat treatment or ageing.

Proceedings ArticleDOI
TL;DR: In this article, the interrelationship between the physical metallurgy and properties of the alloy are explored in a two level factorial study of processing (two levels of Laves precipitation) and age hardening heat treatments (the alloy's standard heat treat cycle and a short time cycle).
Abstract: INCOLOY* alloy 909 is an iron-nickel-cobalt-niobium-titanium controlled low thermal expansion superalloy with an intentional silicon addition. Recommended for use at temperatures to 650°C, the alloy is now specified for major new gas turbine engines. The pseudo-equilibrium time temperature transformation behavior of alloy 909 is presented as well as a brief description of the major phases: Y’ 7 E” , E, and Laves. Gamma prime (r’), the major strengthening phase in the alloy, is shown to precipitate in the 538OC to 760°C rangy. The a” and E phases, which are similar to y” and 6 phase found in INCONEL alloy 718, precipitate at intermediate temperatures (about 700°C to 95OOC). Laves phase, which is used to control grain size, precipitates at the higher temperatures (800°C-1040°C) used during hot working and annealing. The alloy’s Si addition significantly affects the formation of these phases during processing, thereby affecting mechanical properties. The interrelationship between the physical metallurgy and properties of the alloy are explored in a two level factorial study of processing (two levels of Laves precipitation) and age hardening heat treatments (the alloy’s standard heat treat cycle and a short time cycle). Notched bar rupture tests and creep crack growth tests at 538OC demonstrate that resistance to stress accelerated grain boundary oxygen embrittlement (SAGBO) improves with precipitation of intergranular E phase. Excess Laves precipitation lowers residual Nb content, consequently reducing E abundance and reducing crack growth resistance. Combined with proper thermomechanical processing, the short aging cycle precipitates an E grain boundary structure which significantly improves SAGBO resistance.

Journal ArticleDOI
TL;DR: In this article, the results of a neutron powder diffraction study on a compound with x = 0.20 using HRPD at the Rutherford Appleton Laboratories were reported and the structure refinements showed that the ferromagnetic phase is the cubic Laves phase ( alpha =90 degrees ), but the low-temperature antiferromagnetic compound below TN approximately=85 K is distorted to rhombohedral symmetry with alpha = 90.01 degrees at 18 K.
Abstract: Following the recent discovery of a new magnetic phase transition in the Ce(Fe1-xCox)2 compounds for which x<0.3, the authors report the results of a neutron powder diffraction study on a compound with x=0.20 using HRPD at the Rutherford Appleton Laboratories. Rietveld structure refinements show that the ferromagnetic phase is the cubic Laves phase ( alpha =90 degrees ), but the low-temperature antiferromagnetic phase below TN approximately=85 K is distorted to rhombohedral symmetry with alpha =90.20+or-0.01 degrees at 18 K. This distortion coincides with a discontinuity in cell volume at TN.

Journal ArticleDOI
TL;DR: In this article, the authors tried antidiffusive layers of tantalum and niobium to prevent the diffusion of hafnium into the stabilizing copper sheath, and the result showed that the Niobium barriers have a better mechanical matching with the composite; furthermore the tantalum barrier caused the formation of a detrimental V2Ta layer at the interface with vanadium.
Abstract: V2(Hf,Zr) Laves phase superconducting wires are one of the most attractive materials for high field superconducting magnets. The properties of these compounds are high critical field, fairly high critical temperatures, good mechanical behaviour and strong resistance to radiation damage. In the development of V2(Hf,Zr) multifilamentary wires at our Institute we introduced niobium to solve problems related to both the practical manufacturing and the SC behaviour of the compound. We tried antidiffusive layers of tantalum and niobium to prevent the diffusion of hafnium into the stabilizing copper sheath. The result showed that the niobium barriers have a better mechanical matching with the composite; furthermore the tantalum barrier caused the formation of a detrimental V2Ta layer at the interface with vanadium. The addition of niobium in the starting alloys is useful for the mechanical deformation of the wire before reaction but, since niobium enters as substitutional element in the Laves phase, large additions of niobium show a negative effect on the superconducting properties. Small additions of niobium affect the mechanical behaviour positively and have a very small negative effect on the superconducting properties.

Journal ArticleDOI
TL;DR: The magnetic cooling curves and the temperature dependence curves of ac susceptibility reveal that the FeCe amorphous alloy system shows a spin glass behavior in a wide concentration range as discussed by the authors.
Abstract: Several kinds of FeCe amorphous alloys were prepared by high-rate dc sputtering in order to investigate their magnetic properties. The coercive force at 4.2 K is very small as that of FeZr amorphous alloys, suggesting that Ce atoms do not have large magnetic moment due to the valence fluctuation, that is, a tetravelent character. The magnetic cooling curves and the temperature dependence curves of ac susceptibility reveal that the FeCe amorphous alloy system shows a spin glass behavior in a wide concentration range in a similar manner as the FeLu amorphous alloy systems. The Curie temperature is much lower than that of FeLa and FeZr amorphous alloy systems. The room temperature densities in the crystalline and amorphous phases at the Laves phase composition are much larger than the value expected from Vegard's law due to the valence fluctuation of Ce.

Journal ArticleDOI
TL;DR: In this paper, the hydrogen-induced transformation from the crystalline to the amorphous state in GdFe2 has been studied by means of differential thermal analysis, and the driving force for the hydrogeninduced transformation is suggested to be the difference in the enthalpy resulting from the different hydrogen occupation sites in both states of alloy.
Abstract: The hydrogen‐induced transformation from the crystalline to the amorphous state in GdFe2 has been studied by means of differential thermal analysis. GdFe2 absorbs hydrogen in the crystalline state above 420 K by an exothermic reaction. The resultant crystalline c‐GdFe2H3.8 alloy transforms to the amorphous a‐GdFe2H2.8 alloy above 470 K exothermally, which crystallizes to the stable phases α‐Fe and GdH2 above about 700 K. The driving force for the hydrogen‐induced transformation is suggested to be the difference in the enthalpy resulting from the different hydrogen occupation sites in both states of alloy.

Patent
16 May 1988
TL;DR: A hydrogen storage electrode comprising a body of an alloy of the general formula, AB a, or a hydride thereof in which A represents at least one element selected from the group consisting of Zr, Ti, Hf, Ta, Y, Ca, Mg, La, Ce, Pr, Mm, Nb, Nd, Mo, Al and Si, B represents a mixture of rare earth elements, and a is a value of from 1.0 to 2.5 as discussed by the authors.
Abstract: A hydrogen storage electrode comprising a body of an alloy of the general formula, AB a , or a hydride thereof in which A represents at least one element selected from the group consisting of Zr, Ti, Hf, Ta, Y, Ca, Mg, La, Ce, Pr, Mm, Nb, Nd, Mo, Al and Si, B represents at least one element selected from Ni, V, Cr, Mn, Fe, Co, Cu, Zn, Al, Si, Nb, Mo, W, Mg, Ca, Y, Ta, Pd, Ag, Au, Cd, In, Sn, Bi, La, Ce, Mm where Mm is a mixture of rare earth elements, Pr, Nd, Th and Sm provided that A and B are different from each other, and a is a value of from 1.0 to 2.5. The alloy has an alloy phase which is substantially a Laves phase of an intermetallic compound of A and B, and has a crystal structure of a hexagonally symmetric C14 type having crystal lattice constants, a and c, of from 4.8 to 5.2 angstroms and from 7.9 to 8.3 angstroms, respectively, and/or a cubically symmetric C15 type having a crystal lattice constant of from 6.92 to 7.70 angstroms. A method for making the electrode is also described using a sintering or non-sintering process.

Journal ArticleDOI
TL;DR: In this article, the microstructures of ternary alloy compositions based on the highly magnetostrictive (Tb,Dy)Fe/sub 2/ compounds have been investigated by SEM (scanning electron microscope) metallography.
Abstract: The microstructures of ternary alloy compositions based on the highly magnetostrictive (Tb,Dy)Fe/sub 2/ compounds have been investigated by SEM (scanning electron microscope) metallography. The influence of preparation route and heat treatment on the prevailing microstructure has been examined. As-cast and annealed induction melted material have both been examined as a function of iron composition. Lattice parameter variations with composition and heat treatment have been observed. The detailed microstructures have been characterized by BSE imaging, X-ray microanalysis, and electron microprobe analysis. Interpretation of the results has led to the suggestion of a modified phase diagram in the region of the Laves phase compound. >

Journal ArticleDOI
TL;DR: In this paper, the spin-lattice relaxation times T 1 and T 1ρ of protons have been measured in a hexagonal C14 type Laves phase metal hydride ZrCr 2 H 4.
Abstract: The spin-lattice relaxation times T 1 and T 1ρ of protons have been measured in a hexagonal C14 type Laves phase metal hydride ZrCr 2 H 4.2 between 4.2 and 333 K. A Korringa type of relaxation due to conduction electrons is obtained as T 1e T =5.01 sec·K, which is about one order of magnitude smaller than 55.6 sec·K in the C15 type Laves phase ZrV 2 H 4 . T 1 exhibits a minimum owing to the diffusion of hydrogen and an asymmetric variation against 1 / T about this minimum. The results of T 1ρ measurements show that the asyrnmetric variation of T 1 is due to a distribution in the activation energy E for the diffusion of hydrogen. The central value and the width of the distribution of E are determined to be 0.29 eV arnd 0.05 eV, respectively.

Journal ArticleDOI
TL;DR: In this article, a series of ternary compounds R MnGa (R : rare earth metals) was discovered, which have a crystal structure with a high symmetry; a cubic Laves phase, C15.

Journal ArticleDOI
TL;DR: In this article, the Laves phase compounds Ce (Fe1−xRux)2 with x=0.02, 0.04, and 0.06 were measured and the results showed that the ferromagnetic alignment of Fe moments seems to be very easily disrupted by substitution of Ru on the Fe sites.
Abstract: We report ac‐susceptibility measurements on the Laves phase compounds Ce (Fe1−xRux)2 with x=0.02, 0.04, and 0.06. The results show that the ferromagnetic alignment of Fe moments seems to be very easily disrupted by substitution of Ru on the Fe sites. All the three compounds, as well as showing the para‐ to ferromagnetic transition, indicate another transition at lower temperature. In the case of the x=0.02 compound, the character of the susceptibility at the lower transition is similar to that seen in reentrant spin glasses, while in the compounds richer in Ru the suppression of the low‐field response is much more drastic.


Patent
17 Nov 1988
TL;DR: In this paper, the authors proposed to lower hydrogen balance pressure in a high temperature condition (for example, approximately 80°C) and improve discharge characteristics without any loss of high capacity at that process by reducing a nickel amount in a Zr-Mn-V-Mo-Cr-Ni hydrogen storage alloy composition.
Abstract: PURPOSE: To lower hydrogen balance pressure in a high temperature condition (for example, approximately 80°C) and improve discharge characteristics without any loss of high capacity at that process by reducing a nickel amount in a Zr-Mn-V-Mo-Cr-Ni hydrogen storage alloy composition. CONSTITUTION: This electrode is composed of a hydrogen storage alloy or the hydrogen compound thereof expressed by a general formula of ZrMn w Mo x Cr y Ni z , where 0.5

Journal ArticleDOI
A.F. Deutz1, H. B. Brom1, W.J. Huiskamp1, L.J. de Jongh1, K.H.J. Buschow2 
TL;DR: In this paper, the specific heat between 75 mK and 30 K and the a.c. susceptibility, both in zero and non-zero magnetic field, from 1.1 K to 149 K for the intermetallic cubic Laves phase compound TmAl 2.

Journal ArticleDOI
TL;DR: In this article, a clear metamagnetic transition in C15-type Laves phase compounds Lu(Co1-xAlx)2 has been observed by magnetisation measurements in pulsed high fields up to 400 kOe at 4.2 K.
Abstract: A clear metamagnetic transition in C15-type Laves phase compounds Lu(Co1-xAlx)2 has been observed by magnetisation measurements in pulsed high fields up to 400 kOe at 4.2 K. The magnetic moment power Co atom after the transition and the critical field for x=0.06 are 0.74 mu B and 220 kOe, respectively. Analysing the concentration dependence of this metamagnetism, the authors have first estimated the moment and the critical field for LuCo2(x=0), both of which are larger than the recent theoretical values.

Journal ArticleDOI
TL;DR: In this paper, the electronic structure of itinerant d electrons in the intermetallic compound NbFe2 with the C14 Laves phase structure is calculated in the tight-binding approximation.
Abstract: The electronic structure of itinerant d electrons in the intermetallic compound NbFe2 with the C14 Laves phase structure is calculated in the tight-binding approximation By using the calculated density of states curve and taking into account the effect of spin fluctuations, the temperature dependence of the paramagnetic susceptibility is calculated A fair agreement between the calculated and observed results is obtained

Patent
07 Oct 1988
TL;DR: In this paper, the composition of ZrMn2-type Laves phase structure with its Mn partially substituted by Co and Zr partially substituted Zr1-wTiw(Mn1-xCox)y Alz.
Abstract: Hydrogen absorbing ZrMn2 alloys having MgZn2-type Laves phase structure with its Mn partially substituted by Co and containing Al as an additive and having the composition Zr(Mn1-=xCox)y Alz; Hydrogen absorbing ZrMn2 alloys having MgZn2-type Laves-phase structure with its Mn partially substituted by Co and Zr partially substituted Zr1-wTiw(Mn1-xCox)y Alz; and Hydrogen absorbing alloys formed from ZrMn2 alloy having MgZn2-type Laves-phase structure or from a multicomponent alloy made therefrom by partially substituting the Zr and Mn with some other element, by further adding thereto at least one element or rare earth, Ca, and Mg.

Journal ArticleDOI
Lovleen1, R. Kamal1
TL;DR: In this paper, the Curie temperature Tc measured from vibrational sample magnetometric measurements of the magnetic moment with temperature is found to be 650(10) K. The effect of titanium on Tc appears to be insignificant.
Abstract: Elements in atomic ratios corresponding to Nd2(Fe0.8Co0.1Ti0.1)14B were melted and annealed. A Mossbauer spectroscopic study was then carried out between 100 and 650 K. The Curie temperature Tc measured from vibrational sample magnetometric measurements of the magnetic moment \ gm with temperature is found to be 650(10) K. The effect of titanium on Tc appears to be insignificant. However, the Mossbauer spectra reveal two transitions, one at low temperature (about 275 K) and the other at high temperature (above 650 K). The spectra could be analysed in terms of Nd2(Fe, Co)14B as the main phase and TiFe2 and Nd1.1Fe4B4 as the sister phases. The fraction of iron distributed among the various phases is also estimated from the spectra. It appears that titanium also inhibits the formation of Nd2Fe17 and forms a Laves phase TiFe2 with iron atoms. Titanium could, therefore, be helpful in preventing the formation of the low coercivity iron-rich structures in NdFeCoB magnets. The technique adopted here for the identification of various phases could be extended to study the influence of elements other than titanium in these magnets.