Showing papers in "Journal of Physics and Chemistry of Solids in 1959"

TL;DR: In this article, the sign of the superexchange interaction is closely connected with the symmetry of the electron orbitals and the cation orbital state when the cations are subject to the crystalline field arising from octahedral or tetrahedrally surrounding anions.

TL;DR: In this article, a B.C.S. theory for very dirty superconductors is sketched, where elastic scattering from physical and chemical impurities is large compared with the energy gap.

TL;DR: In this article, a quantum theory of electrical conduction in crosfsed electric and magnetic fields is given for the limit of very weak scattering, where a density matrix formulation of the problem is used, and an arbitrary scattering mechanism is considered.

TL;DR: The spin-wave resonance studied in this paper is a modified ferromagnetic resonance, which is strongly influenced by the exchange interactions existing in the akin depth, and the underlying physical conditions are explained and a general exchange boundary condition is formulated and derived.

TL;DR: From measurements of resistivity, activation energy, and Seebeck effect, an energy-level scheme is derived by which the semi-conducting properties of CoFe2O4 can be described as discussed by the authors.

TL;DR: The elements mercury, cadmium, and tellurium have been purified, and crystals of the compounds CdTe and HgTe, and of the mixed compounds cdTe-HgTe have been prepared as mentioned in this paper.

TL;DR: In this paper, it is shown that in order to account for the formation of porous anodic oxide films on aluminium, it is necessary to assume that oxygen as well as aluminium is capable of diffusing through the compact part of the film.

TL;DR: In this article, the authors propose a systematique of the structure of the magnetique in terms of the temperature critique and its periode incommensurable avec celle du reseau cristallin, i.e., it reste stable en dessous de la temperature critique.

TL;DR: In this article, the electrical conductivity, thermoelectric power and thermal conductivity were measured on Bi2Te3 and the alloy systems (Bi,Sb) 2Te3, Bi2(Te,Se)2 and Bi2Sb 2 Te3, with a temperature difference of 65°C between the hot and cold junctions, with the hot junction at 300°K.

TL;DR: The heat capacity of vitreous silica has been measured between 23 and 19°K with an estimated accuracy of ±2 per cent at the lowest temperatures and ±05 per cent for 10°K T 0 as mentioned in this paper.

TL;DR: In this article, a tight-binding model was proposed to assign symmetry assignments of p valence bands and s conduction bands for ZnO and CdS on the basis of a tight binding model.

TL;DR: The behavior with temperature variation of the small-signal dielectric constant of single crystals of SrTiO 3 has been measured from 296 down to 1.4°K as discussed by the authors.

TL;DR: In this article, it was shown that a Curie or Neel temperature does not appear until a finite concentration of magnetic atoms is obtained if the atomic distribution is random, but the concentration depends on the co-ordination number of the lattice and on the range of interaction.

TL;DR: The Born-von Karman theory of crystal dynamics has been applied to the diamond structure, and the most general force system involving interactions between each atom and its first through sixth order neighbors has been derived as mentioned in this paper.

TL;DR: In this paper, the electronic structure of a new type of color center, which is produced in KCl, KBr, and LiF crystals by X-irradiation at low temperatures, has been determined by electron-spin-resonance experiments.

TL;DR: In this paper, the mobility, thermoelectric power, Hall coefficient, and far infrared reflectivity of InSb are calculated, taking account of the non-parabolic conduction band as well as the correct wave functions of the electrons.

TL;DR: The theory of friedel based on an exchange interaction between the current carriers and the atomic spins is also shown to be applicable to non-halfintegral spin metals such as nickel and cobalt.

TL;DR: In this paper, the authors used the polarized neutrons of monochromatic neutrons for determining the magnetic scattering amplitudes at various scattering angles and made a comparison between the observed magnetic form values and theoretical values derived from calculated 3D wave functions.

TL;DR: In this paper, the elastic stiffness of aluminum and magnesium was measured over a pressure range from 0 to 6500 bars by a modified ultrasonic pulse-echo method, and the values found are: dC/dP dC′/DP dBs/dC Al 2·31 1·62 5·19 dC 11 / dPdC 33 /dP DC/DC'/dP c 12 +2C 33 − 4C 13.

TL;DR: In this paper, the authors used thermal-gradient crystallization techniques to determine the solid solubilities of aluminum and gallium in germanium in the ranges from 500 and 300°C, respectively, to the melting point of the metal.

TL;DR: In this article, the orthorhombic-to-rhombohedral transition points for members of this series have been determined, and the shape of the resulting curve interpreted on the basis of an ordering of four, coplanar empty orbitals of the Mn+3 ions and steric effects.

TL;DR: In this paper, it was shown that the low-temperature elastic constants of vitreous silica can account for only a small fraction of the lowtemperature heat capacity.

TL;DR: In this article, the ordered alloy NiMn is found to be an antiferromagnet with a very high Neel temperature (> 600°K) on the basis of neutron-diffraction and magnetic-susceptibility measurements.

TL;DR: In this article, it was shown that the composition and thickness of the altered layer both depend on the size of the ion and its energy, and with silver-palladium alloys the composition also depends on the composition of the original alloy.

TL;DR: In this article, an approximate method for calculating the energy band of solids, analogous to the orthogonalized plane-wave method, is derived, which is shown by the example of the energy spectrum of diamond.

TL;DR: In this paper, the effect of nonspherical charge distributions on X-ray and neutron scattering factors has been calculated for d- and f-electrons in cubic, tetrahedral, and hexagonal crystalline fields.

TL;DR: In this article, general equations for the details of the direct absorption edge in a semiconductor when the effects of excitons and of an applied external magnetic field are included, and expressions for the continuous absorption are obtained in an approximation valid in large magnetic fields.