Showing papers in "Materials Research Bulletin in 1985"

TL;DR: In this paper, the temperature dependence of the X-ray-diffraction pattern of Li0.5NiO2 has revealed a first-order transformation above 150°C to the cubic, normal spinel phase Li[Ni2]O4.

TL;DR: In this paper, the structures of most of the MPS/sub 3/ phases (M = Mn, Fe, Co, Ni, Cd) were determined from single crystal analysis.

TL;DR: A new oxygen defect perovskite BaLa4Cu5O13.4, characterized by a mixed valence of copper has been isolated; the parameters of the tetragonal cell are closely related to that of the cubic perovsite:a = 8.644(4) A = a p 5√ and c = 3.867(3) A= a p as discussed by the authors.

TL;DR: A fabrication process for pyrochlore free lead magnesium niobate ceramics with a low sintering temperature (∼ 900-1000°C) was developed in this paper.

TL;DR: In this article, a simple model is presented describing the opening mechanism of the diffusion path as a function of composition and temperature for three different NASICON compositions (x=0, x=1.4, y=0.2; x=3) and the diffusion paths and the effective one particle potentials of the Na ions were studied.

TL;DR: In this article, an oxygen-defect perovskite was isolated by reduction of SrMnO 3−x pervskites in the presence of zirconium and its structure was determined by X-ray powder diffraction and HREM.

TL;DR: In this paper, the thermal stability of the oxide H3ONb3O8 with a layer structure was studied and a new form of niobium pentoxide called R′ was introduced.

TL;DR: In this paper, the ionic conductivity of two-phase mixtures of AgBr and Al2O3 has been measured and found to exceed the conductivities of pure AgBr considerably as long as the alumina content is lower than about 15 v/o.

TL;DR: In this article, the electrical conductivity was studied and was found to be altered by 3-orders of magnitude with respect to non-intercalated samples, associed to the initial non-uniform Li distribution and the movement of Li concentration kinks.

TL;DR: In this article, an EPR signal with g=1.997 which acquires high intensity above TC is indicative of activation of the corresponding defect centers, possibly V′Ba.

TL;DR: In this article, the effect of MgO and ZnO addition on the sintering behavior and thermal expansion characteristics of Ca0.5Zr2P3O12 was investigated.

TL;DR: The solid state ionic conductor CuTi 2 (PO 4 ) 3 belonging to the Nasicon family has been synthesized; its lattice parameters have been obtained from X-ray diffraction patterns by comparison with isostructural NaTi 2(PO 4 ), which has been completed by IR and UV-visible spectroscopies.

TL;DR: In this article, the chemical shifts of Kβ1,3, Kβ5 emission bands and XANES of copper and manganese have been measured in several compounds of the system.

TL;DR: In this article, Li0.45VO2 transforms irreversibly to spinel at ∼ 300 °C and this phase is stable to ∼ 420 °C, and differential scanning calorimetric and powder X-ray diffraction data show that Li 0.45V0.1[V1.9]O4 with vacancies on the octahedral B-sites of the spinel structure.

TL;DR: In this article, Li has been inserted into, and extracted from, the spinel Li∼1.0V2O4 both electrochemically and chemically both for 0

TL;DR: In this article, single-crystals of the isotypic compounds PbBiO2X, X  I, Br, and Cl, were prepared by sublimation of pre-reacted micro-crystalline material in the temperature region 670/640°C.

TL;DR: In this article, new fluorine fast ion conductors with tysonite-type structure have been obtained within the BiF31bBF2 (B = Ba, Pb) systems.

TL;DR: In this article, the powder profile obtained by neutron diffraction was analyzed by the Rietveld method, showing that the principal cleavage plane contains together Bi and Mo ions, probably because only small faces are active.

TL;DR: The isotypic ortho-diphosphates Na7(MP2O7)4PO4 (M = Al, Cr, Fe) have been synthesized as discussed by the authors.

TL;DR: In this paper, X-ray powder diffraction data was used to show that a certain fraction of the donor doped BaTiO3 is cubic even at room temperature and that the cubic fraction increases with the donor content.

TL;DR: In this paper, it was found that the molybdenum Mo1 has the highest formal charge and this site does not seem to participate in the electrical conductivity which takes place mainly in the slabs.

TL;DR: The hardness, stiffness, and toughness of Ni-alumina gel specimens were measured by indentation methods as mentioned in this paper. But the hardness, stiffness and toughness were not evaluated.

TL;DR: Ionic conductivities of layered titanates, Na2Ti3O7 and K2Ti4O9, and their derivatives were measured on the polycrystalline samples.

TL;DR: In this article, a chemical deintercalation of α-NaFeO2 using bromine as oxidizing agent was investigated and the product had a composition about Na0.9FeO 2 keeping the host layer structure as it was.

TL;DR: In this article, the authors found that the bond between anionic (P2S6)4− octahedra, is easily stretched upon cation substitution and that the radii of anionic radii follow the expected variation according to their high spin configuration in octahedral sulfur environment.

TL;DR: In this paper, the insertion of lithium in LixVO2(B) has been studied by chemical insertion, linear sweep voltammetry, coulometric titration, constant current discharge and emf measurements at temperatures between 25°C and 120°C.

TL;DR: The layered mixed-oxide hydrates, V /SUP v/ OPO/sub 4/. 2H/sub 2/O react with alkylammonium iodides to form (RNH/sub 3/) /SUB x/ V/SUB X/ /SUP 1v/ V / SUP v/ /sUB 1-x/ OAO/ sub 4/

TL;DR: In this paper, a structural approach has been investigated using XANES and EXAFS analysis of the K edge spectra of Cr, Zn and Br. Results of X-ray absorption analysis indicate an octahedral coordination for Cr and Zn, and a delocalisation of X anion.

TL;DR: The non stoichiometric compound V0.78PS3 has been obtained as single crystals from a preparation corresponding to the atomic ratio V/P/S = 1/1/3 as mentioned in this paper.

TL;DR: In this paper, the copper Chevrel phase, CuxMo6S8−z (x=0−4, z=0-0.2), was evaluated as the cathodes in lithium organic electrolyte cells.