A new perovskite related structure was found in the sample of nominal composition of Ba0.5Sr0.5CuOz which was synthesized at a high pressure of 6 GPa. The space group for the new structure was determined to be Pmmm by means of a transmission electron microscopic observation. The lattice parameters were: a=3.92 A ̊, b=3.94 A ̊ and c=7.93 A ̊. In this structure, a cation ordering was revealed by means of a structural simulation. The ordering sequence of atomic layers was as follows: [Sr-CuO2-Ba-CuO2-Sr]. Although no evidences for superconductivity were obtained in the present work, it should be emphasized that compounds of this structure would exhibit superconductivity because CuO2 planes were contained in them.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering