Showing papers in "Journal of Solid State Chemistry in 1989"

TL;DR: In this article, thermogravimetric measurements were made in the range 10 −5 ≤ P( O 2 ) atm ≤ 1 and 300 ≤ T °C ≤ 1000, where the solid solution was stable as a single-phase perovskite-type oxide.

TL;DR: In this paper, it was shown that Sr doping caused the LaMnO{sub 3} to dissociate at higher oxygen activities than those necessary for undoped La mnO {sub 3}.

TL;DR: In this article, a bond valence analysis of the title compound indicates that Cu{sup 1+} is found only on the Cu1 site but not on Cu2 or Cu3 sites, and that the bonds most sensitive to Cu oxidation are those formed by Ba and the structure is subject to internal stresses that are close to a ferroelastic instability at x = 6 and ferroelectric instability at X = 7.

TL;DR: In this article, the fundamental, overtone, and combination vibrational bands observed in terms of the variations occurring in the structures of the spinel-type (Fe 3− x Cr x O 4 ) or corundum-type(Fe 2− xCr x O 3 ) solid solutions have been examined in the context of Raman spectra.

TL;DR: In this article, the iono-covalent framework of hollandite has been used to obtain a partially disintercalated single-crystal product of K 0.06TiO2.

TL;DR: In this paper, powder neutron diffraction data have been used to refine the crystal and magnetic structures of the ordered perovskites Sr2LuRuO6, Ba2YRuO6 and Ba2LuLuO6.

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.

TL;DR: In this article, the crystal structures of the double perovskites BaLaZnRuO6, BaLaNiRuOO6 and Sr2FeRuO 6 have been refined using neutron powder diffraction data collected at room temperature.

TL;DR: In this paper, powder neutron diffraction has been used to determine accurate oxygen positions in five simple ternary copper(II) oxides, and the oxygen distribution in these materials was examined.

TL;DR: In this paper, the structure, the phase transitions, and the transport properties of two different phases of LiZr{sub 2}(PO{sub 4}){sub 3} materials prepared by the sol/gel technique were reported.

TL;DR: In this paper, the Jahn-Teller distortion of the copper ferrospinel has been investigated, and the critical number of octahedral-site Cu 2+ ions per formula unit for a cooperative distortion to tetragonal symmetry at room temperature is ca 0.8.

TL;DR: In this paper, the deintercalation of lithium from LiCoO 2 and Li 2 CuO 2 was shown to yield materials of composition Li x M O 2 with x ∼ 0 for Co and x ∼ 1.5 for Cu.

TL;DR: In this article, a full-matrix least-squares refinement with 237 observed reflections and 8 parameters converged to RF = 0.032 (wR < 0.037).

TL;DR: In this paper, the phase diagram of reduced ceria (CeO2−x) due to solid-state reactions yield a complex phase diagram and a change in molar volume of the sample.

TL;DR: In this article, a rhombohedral perovskite structure of NdNiO{sub 3] has been prepared with a low-temperature method, and its magnetic and electric properties have been studied between 4 and 300 K.

TL;DR: In this paper, large crystals of calcium-deficient hydroxyapatites (DAp's) have been synthesized by aqueous precipitation under controlled conditions of pH and temperature.

TL;DR: In this article, structural studies have been performed at room temperature on the anhydrous zeolites, Li 80.7 H 4.9 Na 0.4 Al 86 Si 106 O 384 and Li 46.0 H 5.8 Na 5.1 K 0.4498(12) A for LiX and LiY, respectively.

TL;DR: In this paper, a compositional dependence of the chemical diffusion coefficient was found in high-T c oxide superconductor Ba 2 YCu 3 O 7−δ system was thermogravimetrically studied in a temperature range from 550 to 850°C under an oxygen pressure of 1 to 10 −2 atm.

TL;DR: In this article, the structure of (Y 0.8Ca 0.5.2)Ba2Cu3O6, determined by neutron powder diffraction, is fully consistent with partial oxidation of the Cu(2) O sheets, whereas the linear O Cu(1) O units do not undergo oxidation.

TL;DR: Samples of La2−xBixCuO4 were prepared by codecomposition of the nitrates in air Single-phase products were obtained for x ≦ 1 0 The substitution of bismuth for lanthanum resulted in an increase in delocalization of holes, as indicated by increased conductivity and a decrease in Neel temperature as discussed by the authors.

TL;DR: The existence of superconducting properties in a sample with x = 0.2 tests the nature of exchange-mediated pairing since Ni 2+ ions in these compounds likely are in the spin S = 1 state as mentioned in this paper.

TL;DR: A combination of ac susceptibility, dc magnetization in a variety of applied fields, and electrical resistivity data is reported for five members of the R 2 Mo 2 O 7 series of cubic pyrochlore structure oxides, R = Nd, Sm, Gd, Tb, and Y.

TL;DR: In this article, solid state investigation of the MSGa2S3 systems (M = Sr, Ba) gives evidence of the existence of the following thiogallates: SrGaS4, Sr2GaS5, BaGaS6, Ba4GaS7, and Ba5(BaS4)2.

TL;DR: In this paper, the structure of a-WO3 films was examined based on XRD and the peak positions in the observed PDFs correspond with those in the PDFs calculated from the crystal structure of hexagonal WO3 and WO 3 · 13H2O, and the framework structure of the films was therefore thought to consist of these crystals, three-, four-, and six-membered rings formed by WO6 octahedra.

TL;DR: In this paper, the Raman and infrared reflection spectra of spinel-type halides Li 2 M II Cl 4 (M II = Mg, V, Cr, Mn, Fe, Co, Zn, Cd) and Li 2 MnBr 4 including Kramers-Kronig analyses and oscillator-fit calculations are presented.

TL;DR: In this article, a series of new compounds RAO 3 m (MO ) n (n = 1-11) having spinel, YbFe 2 O 4, or InFeO 3 (ZnO) n types of structures were newly synthesized (R =Sc, In, Y, Lu, yb, Tm or Er; A =Fe(III), Ga, Cr, or Al; M =Mg, Mn, Fe(II), Co, Ni, Zn or Cd) at elevated temperatures.

TL;DR: The nonstoichiometric perovskite Sr2LaFe3O8+y (0 < y < 0.6) has been studied by Mossbauer spectroscopy, X-ray powder diffraction, and magnetic susceptibility techniques as mentioned in this paper.

TL;DR: In this paper, the authors report on the results of synthetic trend studies, powder neutron diffraction, X-ray absorption spectra, and magnetic susceptibility experiments and offer their analysis of the contribution that each makes to the overall understanding of the electronic behavior of Pr in this compound.

TL;DR: In this paper, the structure of CoSb2O6 was investigated by neutron diffraction and magnetic susceptibility techniques, and the structure was tetragonal, of the trirutile type, with space group P4 2 mnm, a = 4.6495(2) A, c = 9.2763(6)A, and with no structural change down to 10 K.

TL;DR: The structures of NaCuO 2 and KCuO 2 have been refined from time-of-flight neutron data as mentioned in this paper, and both are monoclinic and orthorhombic: space group C 2 m, a = 6.7474(1)A, β = 120.767(2)° with CuO = 1.