High-pressure synthesis, dielectric and magnetic properties for A-site ordered perovskite oxides

采用高压合成方法成功合成了cuu3ti4o12固溶体。随着掺杂离子量的增加，A-O和Cu-O键长有系统地增加，室温介电常数显著降低。另一方面，所有样品在cacu3ti4o12固溶体中的磁化率均表现出反铁磁行为。在3-7.5 GPa条件下，高压合成了另一种a位有序钙钛矿型氧化物AA ' 3Ti4O12。成功制备了一种新型的钙钛矿氧化物。将研究其组成与物理性质之间的关系。

The solid solutions based on CaCu3Ti4O12were successfully synthesized by high-pressure synthesis. With increasing an amount of doping ion the A-O and Cu-O bond length increased systematically and the dielectric constant at room temperature decreased significantly. On the other hand, the magnetic susceptibility for all sample in the CaCu3Ti4O12solid solutions showed antiferromagnetic behavior. High-pressure synthesis of another A-site ordered perovskite type oxides, AA’3Ti4O12, was performed under 3-7.5 GPa. A novel perovskite oxide was successfully obtained. Itsrelationship between composition and physical properties will be investigated.