Search

The subsolidus phase relations in the system BaO-B2O3-P2O5 were determined. The system can be divided into 16 three-phase regions. There are nine binary compounds and three ternary compounds in this system. (C) 1997 Elsevier Science S.A.

A solid solution with formula (Y1-xTbx)(3)GaO6 (x = 0-0.5) was prepared by solid-state reaction method. Powder X-ray diffraction (XRD) shows that Y3GaO6 is isostructural to Gd3GaO6 (Cmc2(1)), and the lattice parameters are a = 8.8364(1) angstrom, b = 11.0899(1) angstrom and c = 5.3937(1) angstrom. Atomic parameters were derived by Rietveld refinement of the XRD pattern. Photoluminescence (PL) spectra show a strong green emission of 543 nm from the D-5(4) -> F-7(5) transition of Th3+ at room and liquid nitrogen temperature. There is a wide saturation range of the PL intensity for the Th3+ content from x = 0.04-0.20, and a long life time about 1200 mu s for the green 543 nm emission at room temperature. (c) 2006 Elsevier B.V. All rights reserved.

The crystal and magnetic structures of the Laves phase compound NdCo2 in the temperature range from 9 to 300K are determined by Rietveld refinement technique, using high-resolution neutron powder diffraction data. The compound crystallizes in space group Fd (3) over barm above the magnetic ordering temperature T-C (approximate to 100K), in space group I4(1)/amd below T-C and in space group Imma below the tetragonal-orthorhombic structural/magnetic transitions at T-M approximate to 42 K. The assignment of the space groups to the crystal structures of NdCo2 in different temperature ranges complies with the reported Mossbauer studies. Detailed information of the crystal and magnetic structures of NdCO2 at different temperatures are reported. (c) 2005 Elsevier B.V. All rights reserved.