Low-frequency dielectric properties of CaNb2O6 ceramics over a wide temperature range
作者： Haibo Li , Chunchang Wang , Hong Wang , Da Zhang , Nan Zhang
DOI: 10.1016/J.CERAMINT.2015.07.209
关键词:
摘要: Abstract CaNb 2 O 6 ceramics were prepared by a conventional solid-state reaction method. By means of the complex dielectric permittivity, electric modulus spectroscopy, and impedance analysis, properties investigated in temperature range (180–1050 K) frequency (50–1×10 7 Hz). The sample exhibits an intrinsic response with constant 18.06 below 400 K. In from 400 to 1023 K, successively shows relaxor-like peak increasing ramp. Annealing treatments N atmospheres revealed that is consisted two different relaxations (R1 R2) ramp evidenced be another relaxation (R3). Our results demonstrated low-temperature (R1) belongs Maxwell–Wagner-type caused surface-layer effect due inhomogeneous distribution oxygen vacancies. high-temperature R2 R3 are conduction hopping motions singly doubly charged vacancies, respectively. A phase transition have affinity relationship vacancies most possibly related oxygen-vacancy-distribution static disorder state dynamic state.
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