Observation of high dielectric permittivity in single-crystal Bi2Sr2CoO6+δ

✍ Scribed by G. Chern; L.R. Song; J.B. Shi

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 323 KB
• Volume: 253
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(95)00458-0

✦ Synopsis

We have measured the complex dielectric constants of a c-axis-oriented single-crystal insulating sample of Bi2Sr2CoO6+ as a function of frequency (102-106 Hz) and temperature (80-330 K). A large real dielectric constant ( > 104) was found at high temperature and low frequency. This ferroelectric-like polarization results from a thermally activated process with an activation energy of 0.25 eV plus an exponentially increasing temperature-dependent background. Our results support the idea that the high dielectric constant may be a common feature of the high-temperature oxide family.