Synthesis of the novel perovskite-type oxyfluoride PbScO2F under high pressure and high temperature

✍ Scribed by Tetsuhiro Katsumata; Mamoru Nakashima; Hiroshi Umemoto; Yoshiyuki Inaguma

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 625 KB
• Volume: 181
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2008.06.048

✦ Synopsis

We synthesized a novel perovskite-type oxyfluoride, PbScO 2 F, and investigated its crystal structure, thermal stability and dielectric properties. PbScO 2 F has a cubic perovskite-type structure with Pb ions displaced from the ideal A-site positions along the /110S direction. By thermal gravity and differential thermal analyses, we found that this compound is stable up to 963 K (690 1C) under ambient atmosphere. The dielectric permittivity of PbScO 2 F is approximately 80, at room temperature, which is almost the same as KTiO 2 F and smaller than that of PbFeO 2 F. Furthermore, an anomaly in the dielectric permittivity was observed in the vicinity of 100 K that seems to be related to the displacement of the Pb ions.