Structure and oxidation state relationships in ternary copper oxides

Magnetization studies of oxides related to the high temperature cuprate superconductors

“…Lattice parameters were obtained using the least squares fitting program FINAX. Thermogravimeteric analysis (TGA) data for BaCu02+, diffraction measurements to have essentially the same structure as proposed in [60] and [61].…”

“…Powder neutron [91] and x-ray diffraction [92] data at room temperature have also been reported. All of these studies assigned the These results show that there are no structural transformations in Sr2CuO3 between room temperature and 11-12 K, and thus suggest that the leading order magnetic anisotropy arises from magnetic dipole interactions and/or from anisotropy in the exchange coupling tensor.…”

Defect Chemistry of " BaCuO2" I. Oxygen Non -Stoichiometry, Cation Molecularity and X-ray Diffraction Determinations

“…According to their work, the crystal structure is not very different from that described by Müller-Buschbaum et al [5,8] and by Weller and Lines [6,26], and can be more precisely divided into an ordered and a disordered part. The ordered part is built up [9] of: a) Cu180 24 bodies located in the origin and in the center of the cell, b) oxygen-bridged Cu60 12 rings, c) various Ba ions around the Cu-O clusters, and d) fully occupied oxygen positions along the cell axis and in the equivalent position corresponding to cell center ing.…”

“…It was later found that, under appropriate conditions, also "BaNi02" crystallizes in this crystal structure [25]. Weller and Lines [6,26] later re-investigated the crystal structure using neutron powder diffraction, with the main aim of determining more precisely posi tions and occupancies of the oxygens and their depen dence on external conditions. From crystal-chemical arguments, and from the failure of the attempts to refine its temperature factors, they also suggested the removal of the Barium atom at the origin of the cell (the atom with 24-fold coordination according to Kipka and Müller-Buschbaum).…”

Subsolidus Phase Relations of the SrO-In2O3-CuO System in Air

“…[14] Several studies [15][16][17][18][19][20] have been devoted to the SrO-CuO system, in which three phases are known to be stable at 800°C in air: Sr 2 CuO 3 (orthorhombic, space group Immm [21] ), SrCuO 2 (orthorhombic, space group Cmcm [21] ) and Sr 14 Cu 24 O 41 , which is sometimes described as Sr 3 Cu 5 O 8 (orthorhombic, space group Fmmm [22] ). Under conditions of lower oxygen partial pressure, an additional binary oxide with SrCu 2 O 2 composition was observed.…”