Showing papers in "Journal of Physics and Chemistry of Solids in 1977"

TL;DR: In this paper, the authors investigated the electrical properties of reduced ceria, CeO 2− x, carried out on single crystals, and showed that the Seebeck coefficient is independent of temperature, suggesting that the number of carriers is constant.

TL;DR: In this paper, the single crystal elastic constants and their first pressure derivatives have been measured by means of the ultrasonic pulse superposition technique for the NaCl-structure oxides CaO, SrO, and BaO.

TL;DR: In this paper, single crystals of CdSnO3, Cd2SnO4, ln2TeO6 and CdIn2O4 were grown by either flux or high pressure methods.

TL;DR: Mossbauer spectra of bulk and microcrystalline hematite have been analyzed at the Morin transition for both the weak-ferromagnetic (WF) and anti-ferrous (AF) phases simultaneously, increasing precision in the extracted Mossbauer parameters.

TL;DR: In this article, single crystals of the cobalt skutterudites CoP 3, CoAs 3 and CoSb 3 have been prepared by the chemical vapor transport technique using chlorine as the transport agent.

TL;DR: In this article, a model for high-spin/low-spin transitions in solids is discussed including the effect of low symmetry ligand fields and spin-orbit coupling, and the contribution from lattice vibrations is taken into account within the approximation of the Debye model.

TL;DR: In this article, the electron concentration and mobility in polycrystalline In 2 O 3 have been measured as a function of temperature and partial oxygen pressure, in the temperature range from 25 to 700°C.

TL;DR: In this paper, a new method of determining the pressure dependence of the Gruneisen parameter was described, which was carried out on NaCl to 33 kbar at room temperature using an end-loaded pistoncylinder apparatus.

TL;DR: In this paper, the free energy of formation has been determined by assuming that the creation of a vacancy is accompanied by a local dilatation, and taking the thermal expansivity into account, the corresponding formation enthalpy and entropy were found to be temperature dependent.

TL;DR: In this paper, the Raman spectra of NH 4 NO 3, and ND 4 NO3, were studied from 250 to 420K and the results showed that there are four phases separated by first order transitions.

TL;DR: In this article, the strong difference between the paramagnetic Fe 2+ and Fe 3+ spectrum, due to the different quadrupole splitting, is used for the distinction between the two species.

TL;DR: Using recent neutron scattering data for the change in the acoustical spectrum due to hydrogen in Nb, Ta, Pd and including experimental data on the localized mode frequencies and the changes in electronic specific heat, it is possible to calculate the entropy of solution of H in NB and Ta and H and D in Pd absolutely and its temperature dependence.

TL;DR: In this article, it was concluded that proton disorder is not the dominant source of diffuse scattering in squaric acid at Tc = 370 K and the phase transition is essentially two-dimensional with β = 0.137 ± 0.010.

TL;DR: In this article, a deformation-dipole model is used to calculate the Helmholtz free energy F of NaCl, which can be used to predict the temperature and volume dependence of the thermodynamic properties.

TL;DR: In this paper, the effects of impurities on the transformation pressure and the reaction kinetics of α → ω transformation in Ti metal were studied by the electrical resistivity technique upto a pressure of 80 kbar.

TL;DR: In this article, an analysis of experimental data on the dependence of electronic properties of graphite on pressure and acceptor concentration, using the Slonczewski-Weiss dispersion relationship for the free carriers, is made.

TL;DR: In this paper, series expansions in Fourier space are proposed for potentials, fields and field gradients, and the lattice potential is shown to be harmonic on lattice points.

TL;DR: In this article, a variational approach for the van der Waals dipole quadrupole interaction coefficient between two atoms or ions is proposed, and the coefficients for the various ion pairs in the alkali halides have been estimated on the basis of this formula.

TL;DR: In this paper, the low-temperature Raman spectra of all lanthanide elpasolites of the type Cs2NaLn(III)Cl6 have been measured and the observed electronic Raman bands have been identified on the basis of crystal field theory.

TL;DR: In this paper, the lattice parameters a 0 and c 0 of the hexagonal 2H polytype of NbSe 2 ; have been measured over the temperature range 156-478 K for a 0, and 138-482 K for c 0.

TL;DR: In this article, the frequencies of the plasmons of small metal spheres are calculated using hydrodynamic theory and the effects of spatial dispersion and surface diffuseness, which are usually neglected, are included in the derivation.

TL;DR: In this paper, the thermodynamics and kinetics of oxygen incorporation in the alkaline earth fluor ides are discussed, based on the results of calculated energies of formation of a range of defects and defect clusters.

TL;DR: In this article, the diffusion of interstitial solute atoms, which were subject to nearest neighbor solute-solute interactions, was simulated by means of a modified Monte Carlo method.

TL;DR: In this paper, the kinetics of photolysis of thin films of PbI2 have been followed using a quartz crystal microbalance method, and the rate as a function of temperature, light intensity and wavelength has been determined.

TL;DR: In this paper, a method to calculate self-consistent electrostatic fields due to self induced dipoles is evaluated and the influence of the anion parameter on the electrostatic field is investigated for idealized CdCl2 and TiO2.

TL;DR: In this article, a defect structure model was derived from optical and electrical properties of α-MnS samples and the boundary of the homogeneity range towards elemental sulphur was calculated from the model.

TL;DR: In this paper, a Multi-Sublattice Jump Diffusion Model (MSJD) for hydrogen diffusion through interstitial-site lattices is presented, which can be used for systems in which interstitial jump diffusion of impurity particles occurs.

TL;DR: In this paper, the crystal and magnetic structures of KFeO2 have been determined by neutron and X-ray powder-diffraction and Mossbauer-effect techniques, and the crystal structure at 4.2 K and 300 K is orthorhombic and the magnetic space group is Pbca'.