Abstract
Abstract Five compounds from the Sr 2−x Ca x CuO 3 solid solution (x=0.0, 0.5, 1.0, 1.5, 2.0) have been prepared and studied using powder neutron diffraction. The materials are isomorphic with an orthorhombic structure based on corner sharing CuO 4 square planes. Complete replacement of strontium by calcium results in a 14% contraction of the lattice. Related oxygen rich phases of M 2 CuO 3+x (M=Sr, Ba) have been prepared and studied using powder neutron and x-ray diffraction together with thermogravimetric analysis. An orthorhombic and a related tetragonal phase exist for M=Ba whereas for M=Sr only a tetragonal phase can be prepared. An analogous phase with M=Ca could not be prepared. Both of the orthorhombic and tetragonal structures observed in these systems are closely related to the K 2 NiF 4 structure. The existence of solid solutions of nominal composition Mg 2−x Ca x CuO 3 and Sr 2−x Ba x CuO 3 has been investigated using powder x-ray diffraction.
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