High temperature dielectric properties of YMnO3 ceramics
authors Tomczyk, M; Vilarinho, PM; Moreira, A; Almeida, A
nationality International
journal JOURNAL OF APPLIED PHYSICS
keywords ORDERS; ORIGIN
abstract The temperature dependence of the dielectric properties and ac conduction of YMnO3 ceramics annealed under different atmospheres is investigated from 25 to 700 degrees C. The origin of the dielectric anomalies is clarified. Two dielectric peaks in the permittivity accompanied by a single anomaly in the dielectric losses characterize the dielectric response. Simultaneously, three different regions can be distinguished in the temperature dependence of ac conductivity. Oxygen vacancies with an activation energy for the conduction of 1.13 eV are suggested to be responsible for the dielectric anomaly observed at < 400 degrees C. For temperatures > 400 degrees C, the dielectric data are influenced by conductivity and no ferroelectric anomaly is obvious. (C) 2011 American Institute of Physics. [doi:10.1063/1.3629996]
publisher AMER INST PHYSICS
issn 0021-8979
year published 2011
volume 110
issue 6
digital object identifier (doi) 10.1063/1.3629996
web of science category Physics, Applied
subject category Physics
unique article identifier WOS:000295619300119
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journal impact factor 2.286
5 year journal impact factor 2.138
category normalized journal impact factor percentile 54.87
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