Showing papers in "Journal of Physics and Chemistry of Solids in 1985"

TL;DR: In this paper, the second-order Doppler shift contributes to the experimental isomer shift of 57Fe and a comparative study over a very large number of compounds is described.

TL;DR: In this paper, the authors calculated the space charge contribution to the conductance for two-phase systems (bicrystal and dispersion) where the second phase is a "chemically inert" phase such as alumina and silica.

TL;DR: In this article, the unit-cell parameters and crystal structures of CaWO4(scheelite) and CaMoO4 (powellite) have been determined at several pressures to 5 8 GPa.

TL;DR: In this article, the band structures of 32 of the most important semiconductor crystals were calculated using an efficient, minimal basis, orthogonalized LCAO method, which involved diagonalization of small size matrix equations.

TL;DR: In this paper, the tracer diffusion of the impurity ions, 46 Sc, 51 Cr, 54 Mn, 59 Fe, 60 Co, 63 Ni and 95 Zr, in rutile single crystals was measured as functions of crystal orientation, temperature, oxygen partial pressure and Al impurity content.

TL;DR: The Raman spectra of the first-excited electronic state and the nature of the electron-phonon coupling have been investigated in this paper using laser energies near the energies of the absorption edges.

TL;DR: In this paper, the stability of particular magnetic ordering schemes is discussed in terms of an isotropic RKKY mechanism, and the crystal structure and magnetic parameters are given, while the magnetic phase transition from a LSW type structure to collinear antiferromagnetism of +-+- type is found.

TL;DR: In this paper, the authors measured the self-diffusion of 44 Ti in rutile single crystals by serial-sectioning technique as a function of temperature (1000 −1500°C) and oxygen partial pressure (10 −14 − 1 atm).

TL;DR: In this paper, conversion electron Mossbauer spectroscopy has been used to determine the cation distribution in the surface layer of the samples and the results indicate a shift of Co 2+ from octahedral to tetrahedral sites when Co 3+ is substituted in CoFe O 4.

TL;DR: In this article, a defect model for NiO is developed and is fit to the electrical-conductivity data, the deviation-from-stoichiometry data, and the cation-self-diffusion data.

TL;DR: In this article, a self-consistent augmented plane wave (APW) band-structure calculation was performed for stoichiometric titanium carbide with 25% vacancies on the carbon sublattice sites (TiC0 75) assuming a model structure with ordered vacancies.

TL;DR: In this article, the diffusion of 55 Fe has been measured parallel to the c axis of Fe 2 O 3 single crystals at temperatures in the range 708-1303°C and at an oxygen activity of unity.

TL;DR: In this article, the elastic constants measured at low pressures do not predict that an elastic instability, and hence a structural distortion, would occur at elevated pressures, and an ionic pairpotential model which reproduces the properties of CsI at low pressure does not show the distortion to be stabilized at high pressure.

TL;DR: In this article, the authors show that the conduction electrons play a dominant role in determining the magnetic properties of rare earth compounds, leading to the conclusion that the strong magnetic character of the Rh 4 d conduction electron plays a major role in their magnetic properties.

TL;DR: In this article, a discussion of MINDO/3, a semi-empirical molecular orbital program, which was applied to clusters of atoms used to represent silicon dioxide, is presented.

TL;DR: In this paper, laser spectroscopy of Cr 3+ ions makes it possible to follow the crystallization process in a cordiente glass (52 SiO 2, 347 Al 2 O 4 spinel microcrystallites formed during heat treatment), and the splitting of the 2 E level is close to 70 cm −1 and the ¦2 D ¦ parameter ranges between 0 95 and 1 35 cm − 1 This wide distribution is associated with the well known disordered distribution of Mg 2+ and Al 3+ cations in MgAl 2O 4 spin

TL;DR: In this article, the high-pressure X-ray diffraction technique to 340 kbar was used to investigate pyrite p-FeS 2, marcasite m-MnS 2 and MnS 2 2.

TL;DR: In this paper, the authors deduced the nature of intrinsic defects in TiO 2 to be Schottky defects: 2 V.. O + V 4 T1, where T 1 is the number of defects.

TL;DR: In this paper, the structural phase transitions of PACC3H7NH3 and 2CdCl4 (PACC) have been studied by means of Raman scattering.

TL;DR: InTe has been investigated using high pressure x-ray diffraction technique to 340 kbar InTe undergoes a pressure induced phase transition from the tetragonal TISe-type (B37) to the NaCl type (B1) phase.

TL;DR: In this paper, the existence of three main crystalline phases (called III, II and I) in (C12H25NH3)2CdCl4 has been revealed by differential scanning calorimetry.

TL;DR: In this paper, the properties of polycrystalline KUO 2 PO 4 · 3 H 2 O (KUP) and its isotopic derivatives have been investigated in the 4000-10cm −1 range at different temperatures.

TL;DR: In this article, a new experimental technique for the determination of chemical-diffusion coefficients in oxides was described, which does not involve any transfer of matter through an interface, and results obtained at 971°C for various deviations for stoichiometry x of CeO2−x are reported and compared with calculated chemicaldiffusion coefficient D values from other independent transport quantities obtained on the same sample.

TL;DR: In this paper, a simple economic electroless deposition technique was used to obtain thin polycrystalline films of SnO2 and antimony doped SnO 2 with resistivity as low as 10 −3 and 10 −4 cm, respectively.

TL;DR: The 17O NMR measurement was made to elucidate the microscopic nature of vacancy motion in Y2O3-doped CeO2 as mentioned in this paper, where the static electric field gradient associated with lattice defects resulted in the composition dependences of the line width and the intensity.

TL;DR: In this article, the meaning of cross terms in the Onsager equation for diffusion in multicomponent systems is clarified based on the Path Probability method of irreversible statistical mechanics, and the problems involved in increasing the concentration of tracer atoms in tracer diffusion experiments are discussed.

TL;DR: In this article, the authors investigated the site-to-site dependence of radiative decay rates using FLN spectroscopy in single and co-doped Nd3+-Yb3+ doped glasses.

TL;DR: In this paper, a retrospective critical analysis of phase diagrams of the Co-Mn-O system in air has been made and it has been shown that cooling does not preserve the high-temperature state of the system and is accompanied by one or more of the following phenomena: (1) oxidation of a Co N Mn 1−N O solution to spinel-type solid solutions (2) merging of a cubic and tetragonal spinel phase and formation of a homogeneous tetragonally distorted spinel (3) distortion of the spinel lattice (

TL;DR: The volume compression data of Vaidya and Kennedy as mentioned in this paper have been used to recalculate the isothermal bulk moduli and their pressure derivatives and to compare various equations of state.

TL;DR: In this article, the ferro-paraelectric transition in Sr0.5Ba0.6 ceramics has been studied by measuring the dielectric pennitivity as a function of temperature at different frequencies.