Journal ArticleDOI
Preparation, structure, optical, and magnetic properties of lanthanide aluminate single crystals (LnMAl11O19)
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In this paper, a full refinement of the pure lanthanum compound (x = 0) having a quasimagnetoplumbite structure has been performed (final R = 0.039).Abstract:
Rare‐earth aluminates having the general formula LnMAl11O19 with Ln3+ = La, Pr, Nd, Sm, Eu, Gd, and M2+ = Mg, Ni, Co, Mn, Fe have been synthetized. This paper is devoted to mixed compounds of the series La1−xNdx Mg Al11O19 of which large single crystals have been obtained by the flame fusion method. A full refinement of the pure lanthanum compound (x = 0) having a quasimagnetoplumbite structure has been performed (final R = 0.039). Spectroscopic investigations of the (La, Nd) aluminate have allowed the measurement of fluorescence yield and lifetime of Nd3+ in the host lattice as a function of the neodymium content. Additional results have been obtained on the magnetic anisotropy, from susceptibility measurements performed on the Nd3+ aluminate in the temperature range 4–300 K.read more
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Journal ArticleDOI
Crystal structure of strontium hexaferrite SrFe12O19
Xavier Obradors,Xavier Solans,A. Collomb,D. Samaras,José L. Rodríguez,M. Pernet,M. Font-Altaba +6 more
TL;DR: The room temperature structure of SrFe/sub 12/O/sub 19/ hexagonal ferrite has been refined from X-ray single-crystal data in this article, where structural isomorphism of the title compound with the hexagonal Ferrite BaFe/s 12 O/s 19/ has been demonstrated, corroborating that the bipyramidal Fe ions have a fast diffusional motion within a quasiharmonic double-well potential as in BaFe
Journal ArticleDOI
Crystal chemistry of hexaaluminates: β-alumina and magnetoplumbite structures
TL;DR: In this article, two typical types of hexagonal aluminates, β-alumina and magnetoplumbite, are studied and reviewed from this point of view, and the conclusions are that the structure type of hexaaluminates is determined by the charge and radius of the large cations in the conduction layer.
Journal ArticleDOI
Ionic conducting lanthanide oxides.
TL;DR: A review of the current literature on Solid Electrolytes with Rare Earths as Dopants and their applications in Cationic Conductors and Trivalent Cation Conductors finds that the former is more applicable than the latter.
Journal ArticleDOI
Structure refinement of CaO·6Al2O3
TL;DR: In this paper, the crystal structure of CaO·6Al2O3 at 294 K was investigated by X-ray diffraction and refined to an R value of 0.025 for 2735 reflections (1492 independent reflections).
Journal ArticleDOI
Hot corrosion behaviour of plasma sprayed YSZ/LaMgAl11O19 composite coatings in molten sulfate–vanadate salt
TL;DR: In this article, hot corrosion studies of thermal barrier coatings (TBCs) with different YSZ/LaMgAl 11 O 19 (LaMA) composite coating top coats were conducted in 50-wt% Na 2 SO 4 ǫ + 50-wwt% V 2 O 5 molten salt at 950°C for 60h.
References
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Journal ArticleDOI
Scattering factors computed from relativistic Dirac–Slater wave functions
D. T. Cromer,J. T. Waber +1 more
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Versatile and Sensitive Vibrating‐Sample Magnetometer
TL;DR: The vibrating sample magnetometer as discussed by the authors measures the magnetic moment of a sample when it is vibrated perpendicularly to a uniform magnetizing field, as a function of temperature, magnetization field, and crystallographic orientation.
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Melting behaviour and metastability of yttrium aluminium garnet (YAG) and YAlO3 determined by optical differential thermal analysis
TL;DR: The melting point of yttrium aluminium garnet (YAG), reinvestigated by optical differential thermal analysis (ODTA), was found to be 1940±7° C as discussed by the authors, suggesting the presence of two immiscible liquids.
Journal ArticleDOI
Cerium and terbium luminescence in LaMgAl11O19
TL;DR: Under 254 nm excitation LaMgAl 11 O 19 : Ce 3+ shows emission peaking between 340 and 360 nm with a quantum efficiency up to 65%.
Journal ArticleDOI
L'auto-extinction de Nd3+ : Son mecanisme fondamental et un critere predictif simple pour les materiaux minilaser
TL;DR: In this article, the crystal field plays an important role in the self quenching process of neodymium 4F3/2 level and a limit to the easily available ground state splitting is given.