Showing papers in "Materials Research Bulletin in 1972"

TL;DR: In this article, two new copper III + compounds have been prepared under oxygen pressure and investigated, and the first phase LaCuO3 has a distorded rhomboedral perovskite structure (a = 5.431 ± 0.002 A ; α = 60°51′ ± 0°02′) and the second phase La2Li0.50Cu0.

TL;DR: In this paper, single crystals of CaRuO3 and SrRuO 3 orthorhombic perovskites were prepared from halide fluxes and showed similar metallic electrical properties.

TL;DR: In this paper, the atomic positions in both synthetic and mineral fluorapatite (space group P63/m, a = 9.367(1) A, c = 6.884(1), and Z = 2) agree within less than 0.001 A. Although the new atomic parameters differ significantly from those reported nearly 40 years ago by Naray-Szabo and refined by Beevers and McIntyre, the differences generally represent improvements in precision rather than corrections.

TL;DR: In this article, a number of solid solutions based on ferroelectric Bi4Ti3O12 have been determined, and the structural stability of the perovskite layer and the bismuth oxide layer is investigated.

TL;DR: Amorphous tricalcium phosphate (ACP) is the in vitro and in vivo precursor of hydroxyapatite (HA) and bone apatite, respectively.

TL;DR: In this article, the magnetic behavior of the monosilicides of Cr, Mn, Fe, and Co, as well as of solid solutions among them, is presented, with a special emphasis on the development of localized moments in CoSi-based solid solutions.

TL;DR: In this article, the relative importance of 4f bonding and size effects in the formation of LFe2 compounds (L = lanthanide) is discussed, and the lattice parameters of PrFe2, NdFe2 and YbFe2 are discussed.

TL;DR: The semiconductor-metal transition in the phase V 1− x W x O 2 (0 ≤ x ≤ 0.060 ) has been studied by magnetic and electrical measurements over the temperature range 80 −400 K as discussed by the authors.

TL;DR: In this paper, a consideration of the conditions which lead to fracture indicates that cracks will not propagate in a film which is strongly bonded to its substrate unless the film thickness is greater than the Griffith crack length.

TL;DR: In this paper, results of measurements of x-ray diffraction, electron scanning microscopy and electrical conductivity of thick polycrystalline RuO 2 films obtained by decomposing ruthenium trichloride are presented and discussed.

TL;DR: Polycrystalline cubic BN is obtained in a form of lump bodies, by direct conversion from hexagonal BN at pressures of about 60 kbar as mentioned in this paper, which is very close to the theoretical value.

TL;DR: In this paper, Mg-doped GaN diodes have been prepared, which exhibit violet electroluminescence at 4250 A. To the best of our knowledge, this is the first report of visible electrolUMinescence in this wavelength.

TL;DR: In this article, the Czochralski-grown garnets have been measured in the temperature range 296-1400°K and the most important results are: 1) Crystals in the system {Y 3 } [Y x Ga 2−x ] (Ga 3 )O 12 are potentially good substrates for epitaxial films of the system Y 3 Fe 5−x Ga x O 12 and 2) our Czchralski grown crystals of GdGaG actually have the formula {Gd 3 ] [Gd 0.03 Ga 1

TL;DR: In this paper, single crystals of the rare-earth tetraborides up to 1 mm in length have been grown from a molten metal flux using an rf induction furnace.

TL;DR: In this paper, the validity of a perovskite structure model with A-site and B-site vacancies in the system PbO  TiO2 and LaO1.5 was checked by X-ray structure investigations.

TL;DR: In this paper, the edge-defined, film-fed growth (EFG) technique was applied to the growth of silicon ribbons, which contained approximately 10 ppma carbon, 6-40 ppma oxygen, and lesser amounts of other impurities.

TL;DR: In this paper, single crystals of CrO2 with the rutile structure have been grown from a KOH flux at a pressure of 36 kbar and a temperature of 900°C.

TL;DR: In this article, the inversion domains of α-GeTe are identified by making use of specific contrast effects occurring in non-centro symmetrical crystals. And the geometry of the twins is determined by means of diffraction patterns, which may explain the extreme brittleness of the material and for the large figure of merit as a thermoelectric.

TL;DR: In this article, low temperature crystallographic and electrical resistivity data for several ternary molybdenum sulfides are presented and some of these compounds are found to be crystallographically unstable.

TL;DR: Bismuth germanate single crystals doped with neodymium or erbium with and without ytterbium, have been grown by the Czochralski method as discussed by the authors.

TL;DR: In this paper, a thin pyrolytic BN has been formed by chemical vapor deposition and optical absorption measurements of the films indicate that the absorption edge is 5.83 eV.

TL;DR: In this paper, it is shown that the strong interactions between close neighbour cations lead to a metallic character of the MM'P phosphides and MM'As arsenides, and that the NiAs structure type is associated with the strong interaction between close neighbor cations.

TL;DR: In this paper, a high pressure modification of gadolinium molybdate, Gd 2 (MoO 4 ) 3, is described, which is x-ray amorphous with a density intermediate to the established α and β′ structures.

TL;DR: BaCu 4 S 3 has an α→β phase transition at 640 ± 10°C and melts at 879 ± 10 °C and the unit cell parameters and space groups are: α phase, a = 10.7686 (8) A b = 4.0348(6) A, c = 13.2805(9) A, Pnma, z = 4; β phase, b = 3.0584(4) Ab =13.8637

TL;DR: The rare earth fluorozirconates LnZrF 7 have been synthetized for Ln = all the lanthanides + Yttrium as discussed by the authors, and the evolution of the lattice parameters in the series is shown.

TL;DR: In this paper, the cubic-to-orthorhombic transition is observed in Fe3O4 and the cubic spinel structure from room temperature to 4.2°K.

TL;DR: In this article, a simple electrostatic model of the Pauling type with residual oxygen species in the sodalite cage was used to study the energy minimization problem in the case of Ca-exchanged X under vacuum at 500° C and at room temperature.

TL;DR: In this article, the use of polarimetry and interferometry to study the optical properties of nematic liquid crystal films is discussed and theoretical formulation of the amplitudes, intensities and phase shifts of monochromatic light reflected or transmitted from multilayer films and experimental methods of determining the refractive indices and orientation order parameters of NLCs are presented.

TL;DR: In this paper, a solution to the long-standing problem of attaching metal to bone is proposed as one application, which is accomplished with a porous carbon intermediary permitting a transition from solid, nonporous metal to metal-carbon composite to carbon-bone composite to bone.