Showing papers in "Journal of Physics and Chemistry of Solids in 1967"

TL;DR: In this paper, the grain size distribution in discontinuous thin films is obtained when grain growth mechanism is by surface diffusion and interface transfer of adsorbed atoms on the substrate, and the distribution functions obtained are unique in being totally independent of initial distribution, and permit one to calculate the time development of mean grain size, total number of grains, etc.

TL;DR: In this paper, mass spectrometric and weight loss measurements of the species effusing from a Knudsen cell containing GaAs were used to obtain vapor pressures over the temperature range 900-1200°K.

TL;DR: In this paper, the effects of a surface on the contribution to the low temperature specific heat of a Heisenberg ferromagnet from the magnetic degrees of freedom and on the spin deviation associated with a given site are computed by a Green's function method.

TL;DR: The rare earth elements Gd, Tb, Dy, Ho, and Er form compounds with Ge and Si at the 5 : 4 stoichiometry which have orthorhombic crystal structures as discussed by the authors.

TL;DR: In this article, it was shown that oxide phases such as Mo 9 O 26 and W 20 O 58 can be regarded as being derived from the parent ReO 3 -type structure by regular omission of specific oxygen-only planes of type { hk 0} ({120} and {130} respectively).

TL;DR: The pressure derivatives of the elastic constants of α-iron have been determined over the pressure range from 0 to 10kb, by a differential ultrasonic pulse-echo method involving pulse superposition.

TL;DR: In this paper, the phase relation in the V 2 O 3 −V 2 O 5 system and the homogeneity range of each Magneli phases were re-examined by magnetic and differential thermal analyses, in addition to the usual X-ray analyses.

TL;DR: In this article, the ground state and the lowest lying states of angular momentum ± ħ are calculated variationally, first for a simple parabolic conduction band and then for the non-parabolic band of InSb.

TL;DR: In this article, the transition energies of GaAs were analyzed in terms of the theory developed for germanium by Roth et al. They showed that the spectra are isotropic and do not show effects due to the lack of inversion symmetry in GaAs.

TL;DR: In this article, the influence of direction of growth, melt composition and growth speed upon the relative occurrence of the residual acceptor centers in melt-grown GaSb single crystals was studied.

TL;DR: In this paper, the effect of highly absorbed light in increasing the growth rate of surface crystallites in vitreous (amorphous, polymeric) selenium films has been studied in detail.

TL;DR: In this article, the average hyperfine field to average moment ratio is the same for iron-based interstitial compounds with cementite structure, and the effects of the interstitials appear to be mainly local.

TL;DR: In this article, the interactions entre impuretes magnetiques dissoutes dans une matrice normale sont etudiees din le modele de niveau lie virtuel de Friedel ou de moment localise d'Anderson.

TL;DR: In this paper, it was shown that at least two lattice sites are involved in the formation of thermal defects in CsCl structures and that significant defect mixing can be expected to occur at higher temperatures.

TL;DR: In this article, the results of X-ray and chemical analyses, and measurements of critical temperature Tc, are presented, and it is concluded that values of Tc > 18°K should be attainable in the pseudo-ternary system NbNNbCTiN.

TL;DR: The electrical conductivity and thermoelectric power of a single crystal strontium titanate were determined as a function of the PH 2 O P H 2 ratio over crystals at various temperatures as discussed by the authors.

TL;DR: In this article, it is shown that the diffusion occurs through jumps between adjacent octahedral interstitial sites, and the observed variation of the residence time with temperature yields the value (3700 ± 500) cal/g.

TL;DR: LiF freshly cleaved crystal reflectance spectrum between UV and 28 ev, computing dielectric response function and measuring gamma exciton band was computed by as discussed by the authors, which is the first step in computing the response function.

TL;DR: In this paper, the authors examined single crystal and film growth and found that the refractive index of single crystals was 2·16±0·08 and the fundamental optical absorption edge 5·9± 0·2 eV, which could be enhanced by the introduction of excess aluminium.

TL;DR: In this article, it was concluded that the gross broadening observed was attributable to variation of local symmetry caused by the disordering of cations on the octahedral sites of magnetite.

TL;DR: In this paper, the potential energy of a crystal is expressed in terms of Valence coordinates (changes in bond distances, interbond angles, etc.) of the type used for molecules, and an application is made to diamond where dispersion relations along the 100, 111 and 110 directions and the 1ξ0 line are calculated.

TL;DR: In this paper, the surface energy of an ideal unstrained cubic crystal at 0°K has been calculated from theoretical calculations of surface energy based on the broken-bond model with a variety of interaction potentials.

TL;DR: In this article, a low-energy electron diffraction study of clean {111, {100} and {110} surfaces of aluminum and their reaction with oxygen was described, and the procedures followed in order to achieve the atomically clean state were: (i) argon ion bombardments and anneals, (ii) baking in atomic hydrogen and (iii) growth of epitaxial films in situ.

TL;DR: In this paper, the authors employed a mass spectrometer to measure the desorption rate of dissociation products and Auger electron spectroscopy for the determination of surface composition.

TL;DR: In this paper, it was shown that the classical Arrhenius type expression for passing above the barrier is valid only when the transitions inside one well are faster than the tunnelling.

TL;DR: This article propose an approche statistique permettant de traiter ce deplacement dans un materiau non ideal, contenant des defauts de toutes sortes: defaut de structure, inclusion d'impuretes, precipitation de phase.

TL;DR: Partially polarized luminescence (T1u → A1g) is observed when excitation is made by linearly polarized light belonging to the A absorption band (A1g → T1u) of the metal impurity ions with s2 electron configurations (Ga+, In+, T1+, Sn2+ and Pb2+ in KBr crystals as discussed by the authors.

TL;DR: In this paper, the presence of OH − ions in LiF crystals is found to depress the ionic conductivity by up to two orders of magnitude compared with crystals of the same doping level but which are relatively free of OH−.

TL;DR: In this paper, vanadium and niobium understoichiometric carbides are investigated by N.M.R. Knight shifts are determined for all the sites, at different concentrations.