Showing papers in "Journal of Physics and Chemistry of Solids in 1988"

TL;DR: In this paper, the authors examined the effect of viscosity divergence on the stability of the Vogel-Fulcher equation for viscoherence in the energy topology-controlled regime.

TL;DR: A thermoelectric characterization of samples of bismuth telluride of both n - and p -type is carried out, as a function of stoichiometric deviation as mentioned in this paper.

TL;DR: In this article, the energy of formation of antisite defects in Sb 2− x In x Te 3 crystals has been determined for x = 0.0-0.4, these values lying in the range 0.35 -0.44 eV.

TL;DR: In this article, the energy-band structures of TiCx, TiNx,TiOx, VCx, VNx and VOx, for x = 1.0 and 0.75, have been calculated self-consistently by the LMTO-ASA method.

TL;DR: In this article, the temperature dependence of the intrinsic carrier concentration n i in InSb is determined between 200 K and the melting point of the compound (798 K), and an empirical formula describing the temperature variation of n i is proposed.

TL;DR: In this article, a revised theory of the thermoelastic effect was presented which offers an explanation of the mean stress dependence of the thermodynamic constant, and further experimental results were presented to validate this theory, and to demonstrate that the predicted higher harmonic thermal response of a body under a single frequency excitation is indeed observable.

TL;DR: The magnetic properties of the compounds AT2P2 (A = Sr, La, Eu; T = Fe, Co) and EuNi2p2 were studied by 57Fe and 151Eu Mossbauer spectroscopy, and magnetic susceptibility measurements.

TL;DR: The correct form of the diffusion equation in the case of an inhomogeneous medium, whose temperature may also vary in space, has been the subject of some debate in this paper.

TL;DR: In this article, the development of the theory of Auger recombination in direct and indirect band gap semiconductors is summarized, together with a comparison with experiments, and remaining problems are discussed.

TL;DR: In this paper, a detailed theoretical study of the relative energy of normal and inverse spinel structures using both perfect lattice and point defect simulation techniques is presented, where both electrostatic and short-range energies as well as ligand field terms are considered.

TL;DR: In this article, a consistent reanalysis of the description of interfacial segregation in multicomponent systems in terms of macroscopic thermodynamic properties is presented, where an analytical function for the surface tension may be found and the equilibrium surface coverages are identified with minima of this function.

TL;DR: In this article, the heat capacity of pure tetrahydrofuran (THF) clathrate hydrate was measured by an adiabatic calorimeter in the temperature range of 12-300 K.

TL;DR: In this paper, the authors investigated the electrical properties and its relationship to the crystal structure of La 2− x Sr x CoO 4 and showed that the Co-O-Co bond length on the perovskite-like a t − a t plane decreased and the c t / a t ratio increased with increasing Sr content.

TL;DR: In this paper, the authors used solid-state phosphorus-31 NMR to examine a number of synthetic calcium phosphate samples and identified one of the components was identified to be monetite.

TL;DR: In this article, the stability of magnetic ordering in the U sublattice is discussed in terms of the isotropic RKKY theory, and two critical temperatures of magnetic order are observed, the lower one corresponding to the uranium sub-clique and the higher one to the Mn subclique.

TL;DR: The structure of an orthorhombic sample of Ba2YCu3O7 with a superconducting transition at 89 K has been determined by Rietveld profile analysis of neutron powder diffraction data.

TL;DR: In this article, the fluorescence properties of dye-clay complexes were systematically studied, which were formed by the intercalation of rhodamine 590 and pyronine Y into a swelling clay, and the results of X-ray diffraction analysis were observed that the c -axis spacings of the clay could be expanded up to the thickness of the dye molecules with slight lattice distortion of the layers.

TL;DR: In this article, the effect of interstitial-vacancy interactions on both the thermodynamic and kinetic properties of carbon-austenite is discussed, and it is shown that interstitial vacancy interaction may be responsible for negative excess entropies in solutions containing the large interstitials.

TL;DR: The a.c. electrical conductivity of β-LaNb 3 O 9 has been measured in air from 500 to 1275 K and the activation energies before and after the transition are 0.14 and 1.58 eV respectively.

TL;DR: In this article, the complementarity of the uncertainty relation between energy and temperature was shown for any pair of thermodynamically conjugate variables in the framework of general statistical thermodynamics, and for any kind of probability distribution.

TL;DR: In this paper, the authors investigated the high-pressure structural transformations in gadolinium at room temperature and found that up to a pressure of 106 GPa, the metal undergoes four structural transformations.

TL;DR: In this article, a theoretical study based on computer simulation techniques of the spinel-structured oxide, NiMn 2 O 4, is presented, which suggests that the observed semiconducting behaviour is due to hopping of charge-carriers between Mn 2+ and Mn 3+ ions at octahedral sites.

TL;DR: In this paper, the effects of Eu concentration, substitution and crystal structure on the isomer shift were discussed in terms of the Eu-O distance, coordination number and covalency.

TL;DR: In this article, the LMTO-Green's Function method was used to study the electronic states of non-metal and metal vacancies in refractory interstitial alloys: TiC, TiN, TiO, VC, VN, VO.

TL;DR: In this paper, the effect of spherical geometry on metal oxidation enabled by the steady-state transport of mobile charged point defects is addressed by extending the coupled-currents approach of metal oxidation to this non-planar situation.

TL;DR: In this paper, the dielectric properties of a series of oriented smectite clay films including Na+-montmorillonite, Li+-mono-moronite, and charge-reduced montmorillonites were investigated.

TL;DR: In this paper, large single crystals of BaLaGa3O7 containing Nd were prepared by the Czochralski method and studied experimentally by absorption and emission spectroscopy.

TL;DR: In this paper, a simplified valence bond force field with three adjustable paramete and one constraining relationship reproduces the Raman active phonon frequencies of all 10 rutile compounds with an average error of ⩽ 5% in almost all cases.

TL;DR: In this paper, the authors measured hydrogen and deuterium concentrations in aluminum at 600°C in the pressure range from 0.2 to 1.0 atm, by means of a desorption technique which was an outgassing study from thermally gas-charged cylindrical samples with various amounts of voids.

TL;DR: The phase diagram of the quasibinary system Hg 3 Te 3 -In 2 Te 3 was investigated by Guinier X-ray measurements and by DTA experiments as discussed by the authors.