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

采用高压合成法成功合成了基于CaCu3Ti4O12的固溶体。随着掺杂离子量的增加，A-O和Cu-O键长系统性增加，室温介电常数显着降低。另一方面，CaCu3Ti4O12固溶体中所有样品的磁化率均表现出反铁磁行为。另一种 A 位有序钙钛矿型氧化物 AA’3Ti4O12 在 3-7.5 GPa 下进行高压合成。成功获得了一种新型钙钛矿氧化物。将研究其成分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.