Showing papers in "Journal of Solid State Chemistry in 1981"

TL;DR: In this paper, a spinel-type material LiMn2O4 with aqueous acid was found to result in conversion of the spinel to nearly pure MnO2.

TL;DR: In this paper, the X-ray and electron diffraction studies of the oxides LaSrCuO4 have been performed and three domains have been characterized: orthorhombic compounds with La2CuO 4 structure for 0.10 ≤ x < 0.34, tetragonal oxides similar to LaSdrCuO3.

TL;DR: In this article, single-crystal data on the α to β transformation in quartz, which takes place at 573°C, showed that the model which, till now, has best agreed with available X-ray data, does not hold for the neutron data.

TL;DR: A series of oxygen-defect perovskites, containing Cu II and Cu III, La 3 Ba 3 [Cu II 5−2 y Cu III 1+2 y ] O 14+ y, has been synthesized at 1000°C, for 0.05 ≤ y ≤ 0.43 as mentioned in this paper.

TL;DR: A new hydrate of tungsten trioxide, WO 3 · 1 3 H 2 O, was obtained by hydrothermal treatment at 120°C of an aqueous suspension of either tungstic acid gel or crystallized dihydrate as discussed by the authors.

TL;DR: In this paper, the results are discussed referring to the Ca 1− x Sr x FeO 3 system with 0.1 ≦ y ≦ 0.6 and the extreme values are close to those expected for Fe 3+ and Fe 5+.

TL;DR: The electrical conductivity of polycrystalline SrTiO3 was determined for the oxygen partial pressure range of 10° to 10−22 atm and temperature range of 800 to 1050°C as discussed by the authors.

TL;DR: In this article, the electrical conduction in various phases of the system Bi2O3 (Ln = La, Nd, Sm, Dy, Er, or Yb) was investigated by measuring ac conductivity and the emf of the oxygen gas concentration cell.

TL;DR: In this article, single crystals of the delafossite-type compound CuAlO 2 were grown from Al 2 O 3 Cu 2 O melt by a slow-cooling method from 1200°C.

TL;DR: In this article, a ternary compound BaNd2Ti3O10 (1:1:3) and a binary compound Nd4Ti9O24 (1 :1:5) have been identified in the BaO Nd2O3TiO2 system.

TL;DR: Gravimetric measurements on pure and lanthanum-doped SrTiO3 have shown that the reversible change of oxygen content, between specified states of oxidation and reduction, is proportional to the dopant concentration as mentioned in this paper.

TL;DR: In this paper, the Raman spectra of lanthanide sesquioxide single crystals with A-type trigonal structure and B-type monoclinic structure were compared.

TL;DR: In this paper, single-crystal optical absorption spectra of NiO, NiTiO_3, NiWO_4, NiV2O_6, NiNb_2O-6, and NiV_3V_ 2O-8 in the ultraviolet region are presented for the purpose of comparing the spectra.

TL;DR: In this paper, the crystal structure of Mg51Zn20, a phase designated conventionally as "Mg7Zn3", has been determined by the single-crystal X-ray diffraction method.

TL;DR: In this paper, the standard Gibbs energy changes for the formation of an ionic or metallic monoxide from rare earth metal and sesquioxide have been calculated, which is confirmed by experiments in a belt-type apparatus in the range 15 to 80 kbar and 500-1200/sup 0/C.

TL;DR: In this paper, structure refinements of single-crystal Na 4 Zr 2 Si 3 O 12 polyhedra were carried out at 25, 300, and 620°C.

TL;DR: In this article, the negative enthalpies of mixing in (Ni x Mg 1−x )O and (Ni X Zn 1− x )O were modeled in terms of a tendency toward ordering in the solid solutions, the proposed ordering scheme finding support in spectroscopic, structural, and magnetic data.

TL;DR: The electrical resistivity of the tungsten oxide, W18O49, is 1.75 · 10−3 Ω cm along the needle axis as discussed by the authors, indicating that most of the charge carriers are delocalized.

TL;DR: In this paper, the Rietveld profile-analysis refinement procedure has been applied to X-ray powder diffractometer data collected from tin(II) oxide with Cu Kα radiation.

TL;DR: The phase diagrams of 14 SrF 2 (Y, Ln )F 3 systems are given, where Ln are all the lanthanides except Pm and Eu.

TL;DR: In this article, the electrical resistivity and the Seebeck coefficients of Mn3O4, in the temperature range 1100-1700 K, have been measured under oxygen partial pressures of 1−10−6 atm.

TL;DR: In this article, the average Pauling metal-metal bond ordern per metal valence electron (PBO/e) is reported for about 110 metal-rich compounds of transition groups III-VI (including the lanthanides) which are structurally well characterized.

TL;DR: In this article, the authors describe a structure structurale based on polyedres AO8 and AO10 (A = La, Ba), joints par les aretes par les faces, alors que les groupes CuO4 carres plans sont isoles.

TL;DR: In this article, Brosset et al. describe the structure of the RPE of Cr 3+ dans le site orthorhombique (RPE) and show that it is caracte´rise´par un parame`tre de champ axial important.

TL;DR: In this article, the structure of a new form of tantalum trisulfide has been determined from single crystal X-ray diffraction data and refined to an R value of 0.025.

TL;DR: In this paper, the authors derived the positional parameters of the anion in the oxide garnets to the mean constituent ionic radii of the cations occupying the {X}, [Y], and (Z) sites using multiple regression analysis.

TL;DR: In this article, the heavy-atom method was used to solve the problem of α-SrMnO3 crystallization in the hexagonal system with unit-cell dimensions a = 5.454(1) A, c = 9.092(2)A, space group P6 3 mmc, Z = 4.

TL;DR: In this article, the authors used complex impedance diagrams to determine the influence of the vacancy concentration on the ionic conductivity of Na 2 SO 4 (I) solid solutions, and found that the conductivity is strongly correlated to the vacancy concentrations, whereas the size and charge of the substituting ions show no effect within the accuracy of the measurements.

TL;DR: In this paper, the magnetic properties of β-Sr 2 MnO 4 have been studied by neutron diffraction and the value of the exchange integral J / k calculated by the high-temperature series expansion method is about −80 K.

TL;DR: In this paper, the authors show that the two most important factors which determine the compositional variation of the alkali metal chemical potential are the interaction energy between intercalated alkali-metal atoms and the composition of the electron chemical potential.