Showing papers in "Journal of Physics and Chemistry of Solids in 1970"

TL;DR: In this article, a Monte Carlo technique was used to calculate the electron distribution functions in the (000) and (100) valleys of gallium arsenide, and the structure of the distribution function was interpreted in terms of the energy dependence of the scattering processes, particular reference being made to the prediction of a population inversion for fields in excess of about 10 kV cm.

TL;DR: In this article, the statistical mechanics of the isotropic and the weakly anisotropic quadratic-layer antiferromagnet are discussed using spin-wave and Green's function methods.

TL;DR: In this paper, volume compressions of 18 metals and pyrophyllite, boron nitride and talc were determined by monitoring piston displacements in an end-loaded piston-cylinder apparatus.

TL;DR: In this article, the relative stability of transition metals and their stacking fault energies in compact phases is studied in a tight binding scheme using an expansion of the density of states in its moments.

TL;DR: In this article, the temperature and magnetic field dependence of the Hall coefficient factor for polar mode scattering in n-type GaAs was examined in the temperature range from 300 to 77°K.

TL;DR: In this paper, a systematic study of the d electronic charge distribution of transition metals is presented, using an extension of the expansion of the density of states of the D band in its moments.

TL;DR: The d C d P of the elastic constants of LiCl, LiBr and LiI have been measured at 295 K and are presented together with previous results for LiF.

TL;DR: In this article, the Mie-Gruneisen equation of elastic solids is analyzed and the ambiguities are resolved by the rigorous derivation of Leibfried and Ludwig.

TL;DR: In this paper, the authors used torsion pendulum and resonance techniques to investigate polycrystalline lead zirconate-titanate internal friction in the temperature range of 20 −400°C.

TL;DR: Experimental results on critical velocity and critical attenuation changes are presented and discussed in this article, where the critical velocity changes show a uniform behavior for all substances studied, namely a frequency independent and a weak temperature dependent effect.

TL;DR: In this paper, the superconducting critical temperature, magnetic susceptibility and the thermo-electric power of pseudo-binary B 3 A -type alloys with Cu 3 Au-structure have been investigated.

TL;DR: In this article, the authors measured the proton spin lattice relaxation time at 19.00 MHz as a function of temperature in the range 25°-500°C for a series of samples in the α, β and γ phases of titanium hydride.

TL;DR: In this article, the ferrite system Zn x Fe 3− x O 4 was investigated by taking Mossbauer spectra and measuring electrical resistivities of samples with several values of x.

TL;DR: In this article, structural refinements of single crystals of V 2 O 3, and (V 0.962 Cr 0.038 ) 2 O3, by X-ray diffraction techniques show an increase in the short vanadium-vanadium distances at the transition, while the vanadiumoxygen distances remain essentially unchanged.

TL;DR: In this article, the crystal structures of the ternary compounds MNb 3 S 6 (M = Mn, Fe, Co, Ni) have been refined and their magnetic susceptibilities measured using single-crystal samples.

TL;DR: In this paper, electron transfer from the metal atoms increases with increasing carbon content in the VC phase but decreases in the NbC and TaC phases, and the ESCA shifts are compared with heats of formation.

TL;DR: In this paper, it was shown that the activation energy for the aggregation reaction is not equal to the energy of motion of the dipole EM, but rather E M −E ∗ = E B.

TL;DR: In this article, an ultrasonic pulse-echo method was used to measure the adiabatic elastic constants and their pressure and temperature derivatives for AgBr and AgCl at 300 and 195°K.

TL;DR: In this paper, an ESR investigation of a S = 1 2 center in MgO, CaO and SrO consisting of an O − ion neighbored by a substitutional Li + ion is presented.

TL;DR: In this paper, the magnetic moment reduction in the perovskites LaCrO3, YFeO3 and CaMnO3 has been determined by neutron diffraction measurements.

TL;DR: The effect of pressure on the lattice parameters, hence the molar volume, of the hexagonal close-packed phase of rhenium (Re) was determined at room temperature up to 350 kbar by means of X-ray diffraction employing a diamond-anvil high-pressure cell as discussed by the authors.

TL;DR: In this paper, the K β emission spectra of calcium, titanium, chromium, manganese and iron and oxidic compounds of these elements were investigated by means of the fluorescent method.

TL;DR: The amplitude independent internal friction has been measured in a series of vanadium-hydrogen alloys in the temperature range from 4.2 to 450°K, the vibration frequencies being included between 2 × 102 − 1 × 105 Hz as discussed by the authors.

TL;DR: In this article, the free exciton emission in CdS crystals is measured at 4.2 and 77°K both for zero-phonon emission lines (n = 1 A, n = 1 B and n = 2 A ) and for line of exciton annihilation with simultaneous creation of LO phonon ( A 1 - LO).

TL;DR: The structures and lattice parameters of the compounds UN, UP, US and USe have been determined between 4°K and 300°K as discussed by the authors, and the lattice distortion may be correlated with published magnetisation results.

TL;DR: The long-range diffusion of hydrogen and deuterium in vanadium is invesitgated by internal friction measurements in the temperature range from 110 to 930°K; the vibration frequencies are included between 8 and 68 Hz as mentioned in this paper.

TL;DR: The diffusion of hydrogen in niobium has been studied by quasielastic neutron scattering measuring the width of the quasi-elastic line as a function of the scattering vector as discussed by the authors.

TL;DR: In this article, the optical absorption and emission spectra of Yb3+ in zinc-aluminophosphate, alkalibarium-silicate and alkali-barium-germanate glasses have been investigated at temperatures near 20°K.

TL;DR: In this paper, the dependence of the room temperature Hall mobility on the electron concentration is compared with the theoretical curves of Moore and Brooks-Herring, and it is found, that the experimental shift does not follow quantitatively the expected Burstein-Moss shift, presumably due to band tailing and gap shrinkage effects.

TL;DR: The orthorhombic structure of AgF 2 has been determined from X-ray data using Patterson methods and refined by least squares with two different sets of measurements to R = 0·043 and 0·066 respectively as discussed by the authors.