Showing papers in "Materials Research Bulletin in 1968"

TL;DR: In this article, the analysis of the infrared absorption bands in amorphous Ge which correspond to transitions between the three branches of the valence band has shown that the wave functions are delocalized over distances of the order 102A.

TL;DR: In this article, a structural investigation of the Ba 1−x Sr x RuO 3 system as a function of pressure and the composition x was performed and it was found that both pressure and increasing Sr 2+ increase the proportion of cubic close packed layers.

TL;DR: In this article, the characteristics of a number of the more useful materials and particularly Ba 2 NaNb 5 O 15, Sr 2 NaNiB 5 O15, and K 3 Li 2 Nb 5O 15 are considered in some detail.

TL;DR: In this article, rare earth orthoferrites and the analogous cobalt compounds can be prepared by the thermal decomposition of the appropriate rare earth ferricyanide or cobalticyanide compound, e.g., LaFe(CN)6·XH2O.

TL;DR: In this article, the rate required to form non-crystalline solid ∗∗ phases is shown to depend directly on the melting temperature and average coefficient of self diffusion, and inversely upon melt viscosity, relaxation time and linear dimensions of the ionic species comprising the melt.

TL;DR: In this article, a simple electrostatic model was proposed for rare-earth exchanged faujasite and Y zeolites, showing that the La atom is covalently bonded to three 0(3) with weaker bonding to the other three O(3), since similar distorted coordinations occur in other complex lanthanum-oxygen compounds.

TL;DR: In this article, the stability of the compound FeBO3 with the calcite structure and Fe3BO6 with norbergite structure has been determined using magnetic measurements on polycrystalline FBO3 revealed the compound to be a weak ferromagnet with a high anisotropic field below 115°C.

TL;DR: In this article, the properties of amorphous Ge and Si are reviewed: short-range order, electrical conductivity, Hall effect, thermoelectric power, rectification and injection in junctions with single crystals, photoconductivity and non-ohmicity in high electric fields.

TL;DR: In this article, a new polymorphic transition from PbO2-II (orthorhombic) to Pb O2-III (cubic fluorite-type) was found at high pressures.

TL;DR: The perovskite CaCrO 3 has been prepared by the solid-state reaction of CaO and CrO 2 at 65 kbar and 700°C as discussed by the authors.

TL;DR: In this paper, the self-diffusion coefficients for monoclinic zirconia exposed in an oxygen atmosphere at 300 mm were determined for near-stoichiometric monochlinic ZIRconia and the results were interpreted by an anti-Frenkel type defect model.

TL;DR: In this article, the preparation procedure for co-precipitated mixed-crystal sulfates is described and x-ray lattice parameters are given for a large number of these compounds.

TL;DR: In this paper, a formula for solid solutions of SrTiO3 and SrFeO2 was proposed, where the resistivities vary regularly from the insulator SrTi O3 to 8 ohm-cm for the solver, and the perovskite lattice is retained to 0.99.

TL;DR: In this article, the specular and diffuse reflectance spectra of the sodium tungsten bronzes and the oxides W20058, W18049 have been measured in the range 45,000 −5,000 cm −1.

TL;DR: In this article, the pyrochlore structure of new compounds of the type A+32B+42O7 with pyroxide structure were obtained for the rare earth cation or rare earth ion cation and Pd+4.

TL;DR: In this article, the high temperature form of BaNb 2 O 6 was grown from a BaB 2 O 4 flux and the symmetry of the crystals is orthorhombic and the structure consists of a zigzag pattern of edge-sharing pairs of NbO 6 -octahedra joined at corners at nearly 60° and 120° angles to produce rings of six octahedras.

TL;DR: In this paper, an alumino-borosilicate glass with 12 mole percent Fe 2 O 3 was heat treated at temperatures from 650° to 800°C for different times, resulting in partial devitrification.

TL;DR: The solid solution MnP1−xAsx showed a lack of miscibility between 0,10 and 0,53 as discussed by the authors, and a new transition was shown in the compound MnP0,03As0,97.

TL;DR: In this paper, a series of alkali-rare earth niobates of the type A 2 + RE 3+ Nb 5 O 15 was described and the dielectric properties of these phases were examined in terms of the crystal chemistry of the tetragonal bronze-type structure.

TL;DR: In this article, the authors proposed a hexagonal BaTa 2 O 6 with one twelfth of the barium atoms located in tunnels which run in the c direction through the Ta-oxygen framework.

TL;DR: In this paper, a method for the growth of single crystal yttrium and rare earth orthoferrites using PbO(B2O3)x as a flux is given.

TL;DR: In this article, the use of X-ray diffraction, electron microscopy, calorimetry and viscometry for the characterization of amorphous nickel-phosphorus and gold-silicon-germanium alloys is described.

TL;DR: A number of new compounds as well as some well-established ones have been synthesized in single crystal form by the reaction of fused CaCl 2 and BaCl 2 with water and solid oxides as mentioned in this paper.

TL;DR: In this paper, a single crystal of nearly stoichiometric magnetite was obtained by oxidation of polycrystalline iron at 1330°C in a current of CO2.

TL;DR: In this paper, liquid phase epitaxy (LPE) is used to grow the epitaxial layers of GaAs, achieving a capacity of up to 8500 cm2 per volt sec at 300°K and 106000 cm2 at 77°K on (100) orientated substrates.

TL;DR: Hexagonal RbNiF 3 has been found to transform at high pressure and elevated temperature to a phase with the cubic perovskite structure (a = 4074 A ) as mentioned in this paper.

TL;DR: PbSnO3 with a distorted perovskite structure was prepared in a tetrahedral anvil type high-pressure apparatus by the reaction of orthorhombic PbO and SnO2 at 500°C and 60 to 70 kb.

TL;DR: In this paper, the position, strength, and shape of the ultraviolet "OH -band" have been measured for all crystals and the peak absorption constant compared to hydroxide concentrations determined by pH titration of aqueous solutions.

TL;DR: In this article, the occupied d bands of superconducting NbSe2 and semiconducting WSe2 are identified as | ± 2, ∓ 1 2 〉, which is split from the next higher d band | ±2, ± 1 2 ) by the energy gap Eg = 2kcλ − Wb.

TL;DR: In this article, single crystals of T 2 SiO 5 and T 2 GeO 5 were prepared in a Bi 2 O 3 flux and the experimental conditions to obtain these single crystals as well as the results as a function either of the different rate earths or of the ratio of constituents.