High-pressure synthesis of perovskite-derived compounds in the Sr-Y-Cu-O system

Article abstract of DOI:10.1016/0921-4534(92)90203-O

Three perovskite-derived compounds were found in the Sr-Y-Cu-O system treated at 1.6 GPa. These are Sr₃Cu₈O₂, Sr_3.5Y_1.5Cu₃O₂ and Sr₄Y₃Cu₄O₁₄. These compounds are high-pressure phases crystallized in orthorhombic structures. The stabilities of the new compounds depended highly on oxygen pressure. The non-superconducting orthorhombic phase Sr₂YCu₃O₂ was also discovered: It was obtained at a relatively low oxygen pressure. Magnetic susceptibility measurements have revealed that the superconducting transition temperature of Sr₂YCu₃O₂ decreased on lowering the oxygen content.