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Showing papers in "Journal of Solid State Chemistry in 1997"


Journal ArticleDOI
TL;DR: Negative thermal expansion has been discovered in a very large family of oxides represented by the formula A{sub 2}M{sub 3}O{sub 12} where the A and M cations are coordinated by oxygen octahedrally and tetrahedraally, respectively as discussed by the authors.

323 citations


Journal ArticleDOI
TL;DR: In this article, a two-phase region separating an O'-orthorhombic phase stable over 0 ≤ δ ≤ 0.06 and a rhombohedral phase, stable in the range 0.10 − 0.13 − δ ≥ 0.18, is revealed.

290 citations


Journal ArticleDOI
TL;DR: In this paper, it was shown that the doping of perovskite manganites with either chromium or cobalt induces an insulator to metal transition, which is exceptional since such a transition has not been observed to date in charge ordered manganite Ln 0.5 Ca 0.3 with an A-site cation of such a small size.

269 citations


Journal ArticleDOI
TL;DR: In this paper, the structure of groutite and manganite was refined to R values of 1.5% for 479 (groutite) and 2.0% for 821 (manganite) unique reflections, respectively.

212 citations


Journal ArticleDOI
TL;DR: In this paper, the structures of pyrochlore stannates of the typeLn2Sn2O7, withLn=Y, La, Pr, Nd, Tb-Lu andLn =Sm, Eu, and Gd, have been refined by Rietveld analysis from 1.4925 A neutron powder and 1.0 A X-ray powder diffraction data, respectively.

205 citations


Journal ArticleDOI
TL;DR: The structure of a low-temperature form of tungsten trioxide,e-WO3, has been determined for the first time in this article, based primarily on Rietveld analysis of high-resolution neutron diffraction data obtained at 15 K.

183 citations


Journal ArticleDOI
TL;DR: Transport and magnetic studies indicate the following evolution of electronic properties with increasingδ, which creates small-polaron holes that become increasingly trapped at cation vacancies with decreasing temperature in the paramagnetic domain.

181 citations


Journal ArticleDOI
TL;DR: The YBO3orthoborate was prepared by a flux evaporation process and the diffraction lines of its X-ray pattern were indexed on the basis of single crystal data as mentioned in this paper.

179 citations


Journal ArticleDOI
TL;DR: In this article, the double exchange mechanism was used to obtain ferromagnetic insulator BiMnO3, which was synthesized under high pressure, and showed that the highly polarizable Bi3+ion with 6s2lone pair would cause local distortion of the perovskite lattice, which presumably reduces the mobility of carriers.

174 citations


Journal ArticleDOI
TL;DR: In this article, a review of physical vapor deposition (PVD) techniques used for the deposition of these coatings is given, and a survey of investigations to apply them is given.

170 citations


Journal ArticleDOI
TL;DR: The structure of pseudo ternary TeO2-TiO2−BaO glasses was investigated by Raman and infrared spectroscopies as discussed by the authors, and the characterization of nonlinear optical process in these materials using Z scan technique.

Journal ArticleDOI
TL;DR: In this article, the authors suggest that α-hydroxides acquire a positive charge by partial protonation of the hydroxyl ions according to the equationM(OH)2+xH+→[M( OH)2−x(H2O)x]x+.


Journal ArticleDOI
David B. Mitzi1, K. Liang1
TL;DR: The lattice constant for NH 2 CH=NH 2 SnI 3 is found to be a =6.316(1) A, which is approximately 1.2% larger than that for the isostructural compound CH 3 NH 3 SnI3 as mentioned in this paper.

Journal ArticleDOI
TL;DR: In this paper, the structural characterization of boron-doped LiCoO2 was carried out using low-spin Ni3+probes and showed a distorted tetrahedral coordination.

Journal ArticleDOI
TL;DR: In this paper, the transport and magnetic properties of stoichiometric and Li-rich LiMn 2 O 4 spinels are investigated, which are associated with a structural phase transition from cubic to tetragonal.

Journal ArticleDOI
TL;DR: The first quasi-elastic neutron scattering analysis of proton mobility in the solid electrolyte CaHPO4·2H2O (brushite) is reported in this paper.

Journal ArticleDOI
TL;DR: In this paper, a new route to synthesize pure TiN, VN, and CrN from the ammonolysis of TiS 2, VS 2, and Cr 2 S 3 is described.

Journal ArticleDOI
TL;DR: In this article, the crystal structure refinement of LaFe{sub x}N{sub 1-x}, O{sub 3} (0 {le} x {le 1) solid solutions was determined and analyzed by means of Rietveld refinement from X-ray powder diffraction data.

Journal ArticleDOI
TL;DR: In this paper, the authors measured the equilibrium oxygen chemical potential and the partial energy and entropy of perovskites La1−xSrxCoO3−δ were measured as a function of δ and x by high-temperature oxygen coulometric titration.

Journal ArticleDOI
TL;DR: In this article, the authors used MAS-NMR studies to show that lanthanum and cerium interacted with alumina and produced a compound with aluminum ions in tetrahedral symmetry.

Journal ArticleDOI
TL;DR: In this paper, the electrochemical study of LiCrIIIyMnIII1−ymnIVO4compounds, 0≤y≤1, between 3.5 and 5.4 V vs Li metal, shows that the Cr substitution is beneficial to the overall performances (capacity, specific energy, and cyclability) fory ≥ 0.62, and thaty=0.25 gives the best results.

Journal ArticleDOI
TL;DR: In this article, high-resolution neutron powder diffraction data were used to analyze the structure of ZrV2O7 at seven temperatures from −263 to 470°C.

Journal ArticleDOI
TL;DR: In this paper, a solution-based procedure via complexation by citrates was used to obtain knowledge about what happens and how to control the metastable o-modification process.

Journal ArticleDOI
TL;DR: In this article, a gel was prepared by adding citric acid to an aqueous solution of lanthanum nitrate and manganese nitrate, and the specific surface area, the La/Mn ratio and the catalytic activity for CO oxidation on LaMnO3+δ were measured.

Journal ArticleDOI
TL;DR: In this paper, the partial energies and entropies of O2 in perovskite-type oxides La0.6Sr0.4Co1−yFeyO3−δ(y=0, 0.25, 0, 4, 0., 0.6) were determined by coulometric titration of oxygen in the temperature range 650-950°C.

Journal ArticleDOI
TL;DR: The structure of Zn(CN) 2 has been reexamined using neutron time-of-flight diffraction and has been determined to have symmetry Pn 3 m, a =5.9227 (1) A at 14 K and 5.8917 at 305 K (negative thermal expansion), in contrast to the ordered arrangement with symmetry P 4 3 m assumed in earlier X-ray diffraction experiments as mentioned in this paper.

Journal ArticleDOI
TL;DR: In this article, the low-temperature luminescence properties of perovskite-derived materials, Ba5M4O15(M=Ta5+, Nb5+) are reported and discussed.

Journal ArticleDOI
TL;DR: In this article, polycrystalline spinel Zn2SnO4films were successfully deposited on alumina substrates by spray pyrolysis, and it was found that the ratio of the two cations in the films obtained differs considerably from the ratio in the initial solutions.

Journal ArticleDOI
TL;DR: The magnetic and transport properties of the Mn(IV)-rich perovskites Ca1−xSmxMnO3 have been investigated in this article, where a peak is observed on theM(T) curves, whose temperatureTpeak increases withx, whereas their height decreases.