Ba 3A2PtCu 2O 10 ( A = Y or Ho): The crystal structure of a reaction by-product of high transition temperature superconductors with platinum metal
Abstract
Mixtures of CuO, BaCO 3, and A2O 3 ( A = Y, rare earth) react at temperatures between 600 and 1000°C with platinum containers to produce crystals of composition Ba 3A2PtCu 2O 10. The crystal structures of the compounds with A = Y or Ho were determined from single-crystal X-ray diffraction data. They are isostructural, monoclinic, space group {C2}/{m}, with Z = 2. Lattice parameters for Ba 3Y 2PtCu 2O 10 are a = 12.520(3) Å, b = 5.817(1) Å, c = 7.357(1) Å, β = 105.53(2)°, V = 516.2(2) Å 3. Lattice parameters for Ba 3Ho 2PtCu 2O 10 are a = 12.516(3) Å, b = 5.813(1)Å, c = 7.350(3) Å, β = 105.54(2)°, V = 515.2(3)Å 3. The structure of these complex oxides has the four metal ions in five distinct coordination environments: two barium sites with coordination numbers (CN) 8 and 11, yttrium or holmium with CN 7, platinum(IV) with CN 6, and copper with CN 5.
- Publication:
-
Journal of Solid State Chemistry France
- Pub Date:
- March 1988
- DOI:
- 10.1016/0022-4596(88)90075-8
- Bibcode:
- 1988JSSCh..73..243G