High-Temperature XRD and DTA Studies of BiMnO3Perovskite

✍ Scribed by H. Faqir; H. Chiba; M. Kikuchi; Y. Syono; M. Mansori; P. Satre; A. Sebaoun

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 177 KB
• Volume: 142
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1998.7994

✦ Synopsis

BiMnO 3 synthesized at high pressure is a triclinically distorted perovskite and a ferromagnetic with T c ‫؍‬ 108 K. High-temperature X-ray diffraction analysis, thermal analysis, thermogravimetry, and magnetic measurements were used to determine stability and the melting sequence of BiMnO 3 phase in air. Structural phase transition from triclinic to tetragonal structure has been determined at 490°C in air for a polycrystalline BiMnO 3 perovskite. Two phases form immediately at the decomposition temperature of 600°C, namely Bi 2 O 3 and Bi 2 O 3 • 2Mn 2 O 3؉ . The Bi 2 O 3 • 2Mn 2 O 3؉ coexists with liquid up to at least 900°C.