Showing papers in "Materials Research Bulletin in 1970"
TL;DR: In this paper, a simple model based on the existence of internal electric fields is suggested to explain the exponential part of the absorption edge observed in many amorphous semiconductors.
1,150 citations
TL;DR: In this paper, the authors investigated the pressure-temperature relations of indium nitride at moderate temperatures and nitrogen pressures and found that the dissociation pressure rises steeply as a function of temperature.
199 citations
TL;DR: In this paper, the growth of ferroelectric PbTiO3 containing less than 0.1 weight % of uranium is found to produce single crystals of high resistivity (> 1010 ohm cm).
150 citations
IBM1
TL;DR: A limited portion of the liquidus field and the entire subsolidus stability region has been determined for tungsten bronze-type solid solutions in the K2O|Li 2O|Nb2O5 system.
115 citations
TL;DR: In this paper, single crystals of the thio-phosphates were grown in sizes up to 10 mm by vapour transport with iodine and the lattice parameters and space groups were given.
111 citations
TL;DR: In this article, a survey of diffraction effects associated with the shear structures and a theoretical analysis of these effects is made, from the main results a method is deduced which enables a full crystallographic analysis of a shear structure from purely geometrical features of the diffraction pattern.
109 citations
TL;DR: In this paper, the most important electrical and optical properties of VO2 below and above the transition temperature between insulating and metallic behavior are analyzed to provide a few basic conclusions regarding the band structure and the transport mechanism.
75 citations
TL;DR: In this article, a perovskite CaFeO 3 with a o = 3.770 A has been synthesized at high temperature and pressure and an isomer shift corresponding to the tetravalent state of iron and a Neel temperature of 120°K were obtained from Mossbauer spectra and magnetic susceptibility measurements.
74 citations
TL;DR: In this article, the problem of localisability of magnetism was discussed from the point of view of localism theory and it was remarked that the local field equations considered as eigenvalue equations must have only localised, not extended, solutions.
71 citations
TL;DR: In this paper, the glass transition temperatures for 6 glasses were determined by DTA and X-ray diffraction data and the possibility that diphastic or microheterogeneous structures exist at both ends of the glass-forming region was indicated from the DTA data.
69 citations
TL;DR: ZnGeN 2 was prepared by the reaction of Zn with Ge 3 N 4 or by the action of ammonia on Zn 2 GeO 4 in carefully determined conditions.
TL;DR: In this paper, a temperature-independent Seebeck coefficient for polaron charge carriers θ ± = ± 198 log (n-p)/p, where the polaron concentration p can be determined from chemistry and the concentration N of available polaron sites is model-dependent.
TL;DR: In this article, a new pyrochlore Cd 2 Nb 2 O 6 S is described, which is an arrangement of cd 2 S and Nb O 6 sublattices.
TL;DR: Several new spinels of general formula A+12A3+12Cr2X4 were prepared, where A+ was Li, Cu or Ag: A3+ was Al, Ga, or In: and X was S or Se.
TL;DR: Negative uniaxial crystals of CdHg(SCN)4 and ZnHg[SCN]4 are shown to be useful nonlinear optical materials as mentioned in this paper.
TL;DR: When the formation of hydroxyapatite in aqueous solution proceeds from the dissolution of non-crystalline calcium phosphate, the crystal growth of the apatite can be divided into two distinct stages as mentioned in this paper.
TL;DR: In this article, a single tungsten trioxide prepared by sublimation has been reduced in vacuo at temperatures up to 850°C. The microstructure of these crystals consisted predominantly of planar defects on {120} R planes.
TL;DR: In this article, the first phases of this composition apparently cannot be obtained except at high pressures, and they were found to be isotypic with LiNbO3 and monoclinic with CuTaO3.
TL;DR: In this paper, it was shown that during irradiation the hydrogen reacts with trapped holes and electrons of color centers to form both hydroxyl and hydride groups as indicated by IR absorption studies.
TL;DR: In this paper, large crystals of rare earth iron garnets having magnetically uniaxial regions under 211 faces may be grown from a PbO·PbF 2 ·B 2 O 3 flux.
TL;DR: In this article, the luminescence of a number of oxides containing post-transition metal ions with a filled d-shell is reported, including Ca2Sb2O7, Li2SnO3 and Li3SbO4.
TL;DR: In this article, a detailed analysis of the Fe57 Mossbauer spectrum of FeTa2O6 at 4°K, the ground state orbital wave function and the direction of the magnetic moment of Fe2+ were determined.
TL;DR: In this article, the boron-scandium system has been studied in a large range of temperature (1200-2200°C) and composition ( 2 ⩽ B Sc⩽ 100 ) by borothermic reduction of Sc2O3 under high vacuum.
TL;DR: The stability of the metallic perovskites is related to the electron concentration and tetragonal distorsion appears beyond the limits of stability as mentioned in this paper, and two new T6X octahedron compounds have been prepared, respectively SbMn3N with the T1 type and AsMn 3N with T4 type.
TL;DR: In this paper, the strong dependence of the kinetics photoresponse on the wavelength of exciting light was found in vitreous samples of arsenic selenide and the experimental results can be explained supposing the additional thermal excitation of localized holes, which were created during the long wavelength illumination.
TL;DR: In this paper, it was shown that superconductivity and ferroelectricity seem to exclude each other in organic materials, and the dominant properties of the two phenomena are determined by a purely dimensional argument.
TL;DR: In this paper, the pseudo-binary system V x W 1− x O 2 has been studied by X-ray powder diffraction methods after heat treatment of the samples at 1 100°C.
TL;DR: In this article, the ternary composition 15 B 2 O 3 -37.5 BaO (mole ratio) was synthesized in both powder and single crystal form from the Ternary Composition 15 B O 3 − 37.5 Fe 2O 3 - 47.5 B 2 Fe 6 O 11.
TL;DR: The oxygen-deficient pyrochlore Pb 2 Ru 2 O 7−x transforms to an orthorhombic perovskite near 90 kbar and 1400° C as discussed by the authors.