Reversible structural phase transition of BaPb0.75Bi0.25O3.00 around 360°C

✍ Scribed by Takuya Hashimoto; Eiji Harayama; Ryo Hirasawa; Hidefumi Hirai; Toshikazu Yoshida; Yuki Yonemura; Hideki Tanaka; Hiroaki Tagawa; Junichiro Mizusaki

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 481 KB
• Volume: 246
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(95)00157-3

✦ Synopsis

The structural phase transition of superconducting BaPbo.TsBio.2503.0o with stoichiometric oxygen composition was revealed by X-ray diffraction measurement and differential scanning calorimetry. X-ray diffraction revealed that the crystal symmetry of BaPbo.75Bio.2503.oo was orthorhombic in the temperature range of 25°C ~ 350°C while it was pseudo-cubic in the temperature range of 400°C ~ 500°C. The volume expansion coefficient was calculated from the dependence of the lattice constants on temperature, which was 3.12 x 10 -s K -1 between 25°C and 350°C and 3.75 × 10 -5 K -1 between 400°C and 500°C. Differential scanning calorimetry showed that the transition was reversible with a heat of transition of ~ 200 J/mol which took place at 360 4-3°C.