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- Title
Dielectric relaxations and phase-transition-like behavior in SmAlO ceramics at high temperatures.
- Authors
Lei, Changmei; Wang, Chunchang; Li, Teng; Wang, Guojing; Sun, Xiaohong; Liu, Lina; Wang, Jing
- Abstract
SmAlO3 ceramics samples were prepared via the solid-state reaction route. The low-frequency (20-107 Hz) dielectric properties were investigated in the temperature range from 100 to 800 °C. It was found that SmAlO3 shows a flat dielectric plateau with the value about 20 independent frequency below 220 °C. In the temperature range higher than 220 °C, two oxygen-vacancy related Debye-like relaxations (PA, PB) and a non-relaxation hump (PH) were observed. Our results indicate that: (1) the low-temperature relaxation (PA) is associated with the bulk effect due to hopping motions of oxygen vacancies; (2) the high-temperature relaxation (PB) results from the sample/electrode contact effect; and (3) PH is suggested to be a phase-transition-like behavior as a result of the oxygen-vacancy ordering process.
- Subjects
CERAMIC materials synthesis; SAMARIUM compounds; ALUMINATES; DIELECTRIC relaxation; PHASE transitions; CERAMIC materials; ELECTRIC properties; HIGH temperatures
- Publication
Journal of Materials Science, 2013, Vol 48, Issue 20, p7294
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-013-7549-5