Showing papers in "Materials Research Bulletin in 1977"

TL;DR: In this article, the Mossbauer effect spectrum of stoichiometric CaFeO 3 at 4 K consisting of two magnetic hyperfine patterns with nearly the same intensities is explained assuming a charge disproportionation 2Fe 4+ →Fe 3+ + Fe 5+.

TL;DR: In this paper, phase relationships in the La1−xSrxCrO3 (0.25 ≤ x ≤ 0) system have been investigated and the orthorhombic and rhombohedral structure of La0.75Sr 0.25 CrO3 were refined by profile fitting of neutron powder diffraction data.

TL;DR: In this paper, a large number of fluoride glasses have been obtained in the ZrF 4 ThF 4 ε 4 ǫ BaF 2 systems and their optical transmission range lies from 0,22 to 7μ and refractive index is about 1, 53.

TL;DR: In this article, it was shown that the layered hydrate HUO2PO4 is a rapid proton conductor with a room temperature conductivity of 4 × 10−3ohm−1cm−1.

TL;DR: In this article, a new class of solid Li+ ionic conductors has been found, related to the compound LiZr2(PO4)3, which have conductivities of about 10−3ohm−1 cm−1 at 200°C, which are relatively independent of composition.

TL;DR: The existence of a family of mixed-layer type bismuth compounds with the general formula Bi 4 A 2m−1 B 2m+1 O 6m+9, where A is Na(1+), Nb(5+), W(6+), etc. and m is an integer as 1,2, or 3, was confirmed in this paper.

TL;DR: The transition metal dichalcogenides, such as TiS 2, have been reported to perform well as cathodes in ambient temperature lithium batteries as mentioned in this paper, and the layered, transition metal phosphorus trisulfides also exhibit electrochemical activity.

TL;DR: In this paper, chemical and electrochemical intercalation of lithium in NiPS3 has been performed and X Ray, NMR and the examination of open circuit potential as a function of discharged composition indicate that lithium intercalates in the octahedral voids of the host structure.

TL;DR: In this paper, the products of cathodic reduction are ternary phases AxMo3X4 and Mo3S4 and they were found to undergo topotactic electron-ion exchange reactions at ambient temperatures in aqueous and non-aqueous electrolytes containing transition cations.

TL;DR: In this article, optical and electrical properties of four compounds of the type Cu2ZnAIVX4VI with AIV = Si, Ge and XVI = S, Se.

TL;DR: In this article, the authors present preliminary data on cathodes for room temperature, high energy density, reversible lithium batteries based on the intercalation of lithium into V 1−x M x S 2 (M = Fe or Cr) LiV 2 is first prepared from the metal oxides or carbonates in flowing H 2 S The lithium may then be removed either by reaction with iodine in acetonitrile solution, or directly by charging an electrochemical cell

TL;DR: In this article, the phase transition for rare earth niobates between 500°C and 850°C correspond to a point group transformation 4/mF2/m, which is purely ferroelastic.

TL;DR: In this paper, the average thermal expansion coefficient (αL) of a large variety of cubic and close-packed materials is shown to depend upon the coincidence of preferred orbital extension and site symmetry as well as melting point.

TL;DR: In this paper, the authors examined the ZrO2:CaO and Zr2:Y2O3 systems for possible ordered compounds and identified two fluorite related ordered compounds.

TL;DR: In this paper, the powder patterns of YSiO2N indicate it to have an α-CaSiO3, pseudowollastonite structure, and the great similarity to YBO3 led to an investigation of the "pseudo-vaterite" types which appear also to be, in fact, pseudOWollastonites.

TL;DR: In this article, the transformation of near-surface material on grinding and polishing has been investigated in sintered zirconia of 1 μm grain size and 99 % density containing 4.5 and 7.0 mol % Y 2 O 3.

TL;DR: In this article, the crystal structure of stoichiometric mixtures of (La/sub 2/O/sub 3/ + RuO/Sub 2/) with excess KClO/ sub 3 was solved by conventional Fourier and least-squares methods to R = 0.022 and R =0.024, respectively.

TL;DR: The composition of Pb/sub x/Mo/sub 6/S/sub 8-y/ can vary between 0.85 less than x less than 1.05 and 0.6 less than y less than 2.2 at 1100/sup 0/C and is shifted to lower Pb content at higher temperatures as discussed by the authors.

TL;DR: Chabazite from Bozen, Tyrol was ion-exchanged with NaCl solution to Na15.2Al15.8O96. After vacuum dehydration at 320°C, the crystal structure was determined.

TL;DR: In this paper, a perovskite called Ba2LaRuO6 was proposed, where cubic cells for LnIII = La to Dy and hexagonal cells for Yb and Y.

TL;DR: In this paper, the formation of aragonite from amorphous, gelatinous CaCO3 and CaCO 3 · H 2 O precipitated in the solution containing Mg 2+ ion was investigated.

TL;DR: Chabazite from Bozen, Tyrol, was ion-exchanged with CaCl2 solution to Ca1.9Al3.8Si8.nH2O as mentioned in this paper.

TL;DR: In this article, the ionic conductivity and thermal properties of Li5AlO4 and LiOH have been measured in both wet and dry environments, and it was shown that an endothermic reaction at ∼ 415°C and an associated large increase in conductivity is observed both in Li 5AlO 4 in a wet environment and in LiOH.

TL;DR: The pseudobinary Ag 2 Se-Ga 2 Se 3 phase diagram has been redetermined by differential thermal analysis, x-ray diffraction, and crystal growth studies as discussed by the authors, which differs significantly from the one given by Palatnik and Belova but is qualitatively similar to the Ag 2 S -Ga 2 S 3 diagram recently reported by Brandt and Kramer.

TL;DR: In this paper, new anionic electrolytes of formulation MBiF4 (M  K, Rb, Tl) have been prepared, which have a conductivity of the same order of magnitude than β-alumina.

TL;DR: In this paper, it was shown that at low temperature, ≈600°C, the crystals turn black and change to monoclinic, P2/m, a =7.5', with a corresponding change to ≈CeTaO4.50.

TL;DR: In this article, the electron density of h-Cu-chabazite was determined at room temperature, and the cell dimensions in R3m were: hydrated a 9.411(2)A α 95.31(1)°; vacuum-dehydrated at 350°C, 9.9Si8.1O24.2Al3.

TL;DR: In this paper, Barium titanate single crystals are grwon in two ways, i.e. by the Remeika and the Czochralski method, and the stoichiometry Ti/Ba + Sr is excellent in pulled crystals but the Ti, Ba, Sr, K concentrations in Cu-doped crystals show ion size effects in the compensation mechanism.

TL;DR: In this article, a systematic study of the preparation of CsAlSiO/sub 4/ using various cesium oxide, alumina, and silica sources and a typical set of firing conditions was performed.

TL;DR: The structural characteristics of columbite niobates MNb 2 O 6 (M = Mg, Ca, Mn, Fe, Co, Ni, Cu, Zn, Cd) from their X ray diffraction powder patterns and indexed according to the Pbcn space group are given in this article.