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Showing papers in "Materials Research Bulletin in 1984"


Journal ArticleDOI
TL;DR: Lithium has been removed electrochemically at 15 μA/cm2 from LiMn2O4 (spinel) to yield single phase Li 1−xMn 2O4 for 0 as mentioned in this paper.

827 citations


Journal ArticleDOI
TL;DR: In this paper, the authors report the discovery of a new structural family for use in ultra-low "α" ceramics, Ca 0.5 Ti 2 P 3 O 12 abbreviated [CTP] after which the structural family is named.

161 citations


Journal ArticleDOI
G. de1, H.J.A. Van Dijk1
TL;DR: In this article, the sintering of Y 3 Al 5 O 12 to full density and translucency using either SiO 2 or MgO as a dopant is described.

155 citations


Journal ArticleDOI
TL;DR: In this paper, the interlayer cations of the montmorillonite are exchanged with the partially hydrolyzed trinuclear acetato complex ions, which are converted into iron oxide pillars which keep the silicate layers apart and form micropores between the layers.

142 citations


Journal ArticleDOI
TL;DR: In this paper, direct precipitation of fine powders of lead zirconate titanate (PZT) in the complete range of solid solution under hydrothermal conditions, starting from lead oxide and titania/zirconia mixed gels, is investigated.

139 citations


Journal ArticleDOI
TL;DR: In this paper, the authors examined the structural characteristics of delithiated LiVO2 prepared by chemical and electrochemical methods and examined by powder X-ray diffraction techniques, showing that removal of lithium from the layered LiVO 2 structure (space group = R 3 m ) results in a rearrangement of the vanadium ions in the cubic-close-packed oxygen lattice.

129 citations


Journal ArticleDOI
TL;DR: The sol-gel process has been extended to the preparation of new diphasic xerogels leading to new hybrid ceramic-metal materials as mentioned in this paper, which can be controlled by both preparation steps: the gelation parameters and subsequent thermal treatment.

129 citations


Journal ArticleDOI
TL;DR: In this paper, a model of the transformation mechanism, on lithiation, from the βMnO 2 framework to the [Mn 2 ]O 4 framework of a spinel phase is suggested.

103 citations


Journal ArticleDOI
TL;DR: The thermal expansion of all the alkali members of the [NZP] family has been studied using high-temperature x-ray measurements at the back diffraction angles and dilatometry as discussed by the authors.

97 citations


Journal ArticleDOI
TL;DR: LiCoO 2 (O2) obtained by ion exchange reaction from Na 0.70 CoO 2 has been electrochemically deintercalated as mentioned in this paper, and the original lamellar structure with an ABCBA oxygen stacking is called O2.

86 citations


Journal ArticleDOI
TL;DR: In this article, the structural and magnetic behavior of selected metalloid (B,C) containing hexagonal and tetragonal rare earth-transition metal compounds and compound series was investigated.

Journal ArticleDOI
C.E. Rice1, J.L. Jackel
TL;DR: In this paper, the authors show that polycrystalline LiNbO/sub 3/ waveguides made in neat benzoic acid are prone to refractive index instabilities, and show how such problems can be avoided by limiting the maximum value of x in the guides.

Journal ArticleDOI
TL;DR: In this article, the luminescence of Mn/sup 2 +/, Bi/sup 3 +/, Ce/sup3 +/ in GdMgB/sub 5/O/sub 10/ and some codoped materials is reported.

Journal ArticleDOI
TL;DR: In this paper, the structure of NASICON type ceramics has been investigated for a fixed sintering cycle and it has been shown that the more elements introduced by means of metal-organic reagents, the more shifted structural evolution towards monoclinic structure to high temperatures.

Journal ArticleDOI
TL;DR: In this paper, the authors describe ion exchange reactions of In2Mo6X6 with alkali iodide and chloride salts at 550°C to give mixed solid solutions In2−xMxMo 6X6 (M=Li, Na, K, Rb, Cs; X=Se, Te).

Journal ArticleDOI
TL;DR: In this paper, preliminary results of Mossbauer resonance investigations (57Fe and 119Sn) on ferromagnetic Sn substituted Fe4N show: 1) a preferential substitution in the Fe(I) sites of the lattice 2) a decrease of the particle size with increasing Sn content.

Journal ArticleDOI
TL;DR: In this article, a very similar X-ray pattern was obtained by washing LiTi 0.1 Zr 1.9 (PO 4 ) 3 with 0.3N HCl.

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the energy transfer phenomena in GdTaO/sub 4/ activated with Tb/sup 3 +/ and showed that the ratio of the /sup 5/D/sub 3/ and /sup 4f/sup 7/5d emission intensities of Tb /sup 3+/ depends strongly on the excitation wavelength.

Journal ArticleDOI
TL;DR: Ferrimagnetic resonance (FMR) measurements were made at room temperature on polished spheres of about 0.3 mm size at frequencies between 3 GHz and 90 GHz as discussed by the authors, and the observed FMR linewidth ΔH can be described by a frequency independent two-magnon scattering contribution ranging between 5 Oe and 10 Oe.

Journal ArticleDOI
L.H. Brixner1
TL;DR: In this paper, the lattice constants of rare earth hafnates were reported and the luminescence of such activators as Eu+3, Tb+3 and Ti+4 in La2Hf2O7 was described.


Journal ArticleDOI
TL;DR: In this article, the Ni atoms are located in the octahedral sites of the spinel lattice with both oxidation states 2+ and 3+, as illustrated by the formula : Co 2+ 1−y Co 3+ y [Co 3+ 2−x Ni 2+ y Ni 3+ x−y ]O 4.

Journal ArticleDOI
K.H.J. Buschow1
TL;DR: Most ternary hydrides are metastable and tend to decompose into the stable phases consisting of the binary hydride of the strongly hydrogen-attracting component (RH2 or RH3) and either pure M metal or an intermetallic compound of higher M content than RMn as discussed by the authors.

Journal ArticleDOI
TL;DR: In this paper, the luminescence spectra of LnOCl-Bi 3+ (Ln = La, Y, Gd) and GdOcl-bi 3+ were reported.

Journal ArticleDOI
TL;DR: In this paper, it was shown that the cubic and the rhombohedral structures of rare earth sulfides coexist, and the structural type of the cubic phase can be regarded as analogous to that of NaCl.

Journal ArticleDOI
TL;DR: A family of oxyhalide glasses involving Sb 2 O 3 and various R m X n halides (R = monovalent or divalent cation; X = F, Cl, Br or I) has been prepared as discussed by the authors.

Journal ArticleDOI
TL;DR: In this article, the HZr/sub 2/(PO/sub 4/)/sub 3/ was converted to (H/sub 3 /O)Zr 2/O (HZr 3/O )Zr 4/O(PO 4/4)/Sub 3/ ) by refluxing in water for 12 or more hours.

Journal ArticleDOI
TL;DR: In this paper, the nonstoichiometry of neodymium manganite NdMnO3 phase was studied by a gravimetric method at 1273 K. The oxygen partial pressures were controlled by using flowing O 2 Ar or H 2 CO 2 mixtures.

Journal ArticleDOI
TL;DR: In this paper, a conduction model is proposed for oxidized ferrites, and it appears from the Seebeck coefficient vs composition measurements that the conduction occurs essentially over the octahedral sites, but that the oxygen vacancies trap partially electrons around iron in tetrahedral sites.

Journal ArticleDOI
TL;DR: The photoelectrochemical properties and the diffuse reflection spectrum of MgTiO3 are reported in this article, where the optical absorption edge shifts to lower energy due to the occurrence of Me2+ → Ti4+ charge transfer transitions.