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Space-charge relaxation and electrical conduction in K0.5Na0.5NbO3 at high temperatures

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Abstract

Sodium potassium niobate K0.5Na0.5NbO3(KNN) ceramic was synthesized by a solid-state technique. The X-ray diffraction of the sample at room temperature showed a monoclinic phase. The real part (ε′) and imaginary part (ε″) of dielectric permittivity of the sample were measured in a frequency range from 40 Hz to 1 MHz and in a temperature range from 350 to 850 K. The ε′ deviated from Curie–Weiss law above 702 K, due to additional dielectric contributions resulting from universal dielectric response and thermally activated space charges at high temperatures. This anomaly arose from a Debye dielectric dispersion that slowed down following an Arrhenius law. We have established a link between the dielectric relaxation and the conductivity.

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Authors and Affiliations

  1. State Key Laboratory Breeding Base of Nonferrous Metals and Specific Materials Processing, Key laboratory of New Processing Technology for Nonferrous Metal and Materials, Ministry of Education, College of Material Science and Engineering, Guilin University of Technology, Guilin, 541004, China

    Laijun Liu, Yanmin Huang, Congxue Su, Liang Fang, Meixia Wu & Changzheng Hu

  2. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, 710072, China

    Huiqing Fan

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  1. Laijun Liu
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  2. Yanmin Huang
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  3. Congxue Su
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Correspondence to Laijun Liu.

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Liu, L., Huang, Y., Su, C. et al. Space-charge relaxation and electrical conduction in K0.5Na0.5NbO3 at high temperatures. Appl. Phys. A 104, 1047–1051 (2011). https://doi.org/10.1007/s00339-011-6358-4

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  • DOI: https://doi.org/10.1007/s00339-011-6358-4

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