Showing papers in "Materials Research Bulletin in 1974"

TL;DR: In this article, the authors studied the kinetics of the conversion of amorphous calcium phosphate (ACP) to hydroxyapatite (HA) at pH 8 at 26.0°, 37.5 and 48.0 C, in the presence of Mg.

TL;DR: In this paper, a survey is given on lattice data and structure types of 40 compounds of the type Cu2II-II-IV-S4(Se4) with II = Mn, Fe, Co, Ni, Zn, Cd, Hg and IV = Si, Ge, Sn.

TL;DR: In this paper, a nouveau sulfure de molybdene : Mo3S4, isostructural de Mo3Se4, a ete prepare.

TL;DR: Graphite-like boron nitride was shock-compressed up to 550 kbar as discussed by the authors, and the X-ray diffraction pattern of the recovered specimen identified the wurtzite structure whose hexagonal cell dimensions were a 0 = 2.553±0.003 A, c 0 = 4.228± 0.004 A.

TL;DR: The structure of NdAl3(BO3)4, determined by single-crystal x-ray analysis, is rhombohedral with space group R32 and cell parameters a = 9.3416, c = 7.3066, Z = 3.033, and Rw = 0.037 as discussed by the authors.

TL;DR: In this paper, the A-site deficient perovskite La 2 3 TiO 3 was synthesized under the controlled atmosphere of CO2-H2 mixed gas at 1350°C, and the structure was investigated by the powder X-ray diffraction method.

TL;DR: In this paper, a series of amorphous calcium phosphate and hydroxyapatite samples synthesized under different preparative conditions were studied by the x-ray radial distribution method.

TL;DR: In this article, a disorder appears at high temperature for some of these phases and yields an oxygen deficient fluorite type structure and important modifications of the Raman spectra associated with this order - disorder transformation, are related to the observation of anti-phase domains.

TL;DR: In this paper, the thio(seleno)-hypodiphosphates Sn2P2S6 (yellowish-brown), Sn 2P2Se6 (black), Pb2P 2S6(yellow) and Pb 2P 2Se6(dark-red) have been grown by vapour transport with iodine.

TL;DR: A general survey of alkali metals intercalation compounds with titanium and zirconium disulfides is given in this article, where a model A + x (Ti S 2 x− or A + (Zr S 2 ) x− with an electronic delocalization in the (Ti 2 S 2 ), or (Z r S 2 )) slabs, is suggested according to crystallographic and magnetic studies, N.M.R.

TL;DR: In this article, the spontaneous polarization is 14 μCoulomb/cm2 in the direction of 20°C and the coercive field is 750 V/cm, respectively, at the same temperature.

TL;DR: The pseudo-orthorombic crystal structure of NdP5O14 was determined from three-dimensional MoKα diffractometer data as discussed by the authors, and the true space group is P21/c, the lattice constants are a = 8.7672, b =8.9948, c = 13.0326 A, β 90.48°, and there are four formula units per unit cell.

TL;DR: In this article, an unambiguous assignment of the chalcogen core levels was made by comparing the spectra with those of ZrS2 and ZrSe2 (where all chal cogen atoms are isolated), where the levels of the (Ch2) groups are found at higher binding energies than those of the isolated ch atoms, which is consistent with a larger negative charge on the isolated atoms.

TL;DR: In this article, the growth of NdxLa1−xP5O14 (0 ≤ x ≤ 1) crystals from phosphoric acid solution has been studied, and the results indicate a sevenfold reduction in fluorescence quenching with respect to YAG:Nd.

TL;DR: In this article, the nominal system La1−xMxMnO3, where Pb and Sr were prepared by a variety of precipitation techniques, supported on monoliths of cordierite ceramic, and their catalytic activities with respect to the oxidation of CO were determined.

TL;DR: In this paper, a new refinement of the crystal structure of α-Si3N4 has been carried out using single crystal X-ray diffractometer data, which does not indicate any oxygen in the structure.

TL;DR: In this article, the electrical resistivity of high purity CaSi2, CaGe2, SrSi2 and BaGe2 was measured in the temperature range from 20°C to 800°C by a 4-point technique.

TL;DR: In this paper, the symmetry requirements for secondary ferroic phenomena of ferrobielectricity, ferrobimagnetism and ferromagnetoelasticity were considered, and examples of materials illustrating the behavior discussed.

TL;DR: In this paper, various high temperature binary oxides were rapidly quenched from the liquid state and X-ray diffraction was used to examine the structure of these oxides, and 12 systems have produced pure non-crystalline solid (NCS).

TL;DR: In this article, resistivity measurements of the mixed valence compound Cs 2 Au I Au III Cl 6 at quasihydrostatic pressures up to ∼120 kbar and temperatures down to ∼10 K show a resistivity drop of about 9 decades and a semiconductor to metal transition at ∼60 kbar.

TL;DR: The structure of Cs 2 AuAuCl 6 was determined using single crystal X-ray analysis in this paper, and the overall structure was in accordance with the one proposed by Elliott and Pauling in J.Am. Chem. Soc. 60, 1846 (1938).

TL;DR: In this article, a useful glass formation parameter which is determined from differential thermal analysis (DTA) of a glass sample has been further studied and is expected to be dependent on heating rate.

TL;DR: In this paper, structural and thermal properties have been examined as a function of composition throughout the glass forming region of the AsTe binary system, and evidence is presented to support the conclusion that a new face-centered cubic crystalline structure has the binary stoichiometry AsTe.

TL;DR: In this article, the ammonia and alkali metal intercalation compounds of the transition metal disulfides form hydration complexes in which the intercalated species are separated by a ring of water.

TL;DR: The mode of incorporation of lead ions into Y3Fe5O12 single crystal thin films grown by the LPE technique from lead containing fluxes has been carefully studied using radioactive tracers as the analysis technique as discussed by the authors.

TL;DR: In this paper, a binary transition metal chalcogenides MX 2 (M = transition metal, X=S, Se) may be reduced electrochemically in aqueous electrolyte solutions to give hydrated polyelectrolyte compounds (A x ) x+ (H 2 O) y [MX 2 ] x− (I).

TL;DR: In this article, a small bipyramidal (1.1 mm long × 0.3 mm wide) aluminum nitride single crystal has been reproducibly grown from molten AlNCa3N2 solutions.

TL;DR: In this article, a probable model for the structure of the orthorhombic A -type neodymium hydroxycarbonate is presented, which relies on an optical determination of the site symmetry of OH−, CO2−3, and Nd3+ atoms from infrared and visible absorption spectra, together with a computation of 50 X-ray diffraction lines intensities of a high resolution Guinier powder pattern.

TL;DR: In this article, the spin and valence states of rare earth cobaltites and related compounds were found to be related to the spin properties of the rare earth rare earth elements.