Applied Physics A

, 124:338 | Cite as

Dielectric properties of (K0.5Na0.5)NbO3–(Bi0.5Li0.5)ZrO3 lead-free ceramics as high-temperature ceramic capacitors

  • Tianxiang Yan
  • Feifei Han
  • Shaokai Ren
  • Xing Ma
  • Liang Fang
  • Laijun Liu
  • Xiaojun Kuang
  • Brahim Elouadi


(1 − x)K0.5Na0.5NbO3x(Bi0.5Li0.5)ZrO3 (labeled as (1 − x)KNN–xBLZ) lead-free ceramics were fabricated by a solid-state reaction method. A research was conducted on the effects of BLZ content on structure, dielectric properties and relaxation behavior of KNN ceramics. By combining the X-ray diffraction patterns with the temperature dependence of dielectric properties, an orthorhombic–tetragonal phase coexistence was identified for x = 0.03, a tetragonal phase was determined for x = 0.05, and a single rhombohedral structure occurred at x = 0.08. The 0.92KNN–0.08BLZ ceramic exhibits a high and stable permittivity (~ 1317, ± 15% variation) from 55 to 445 °C and low dielectric loss (≤ 6%) from 120 to 400 °C, which is hugely attractive for high-temperature capacitors. Activation energies of both high-temperature dielectric relaxation and dc conductivity first increase and then decline with the increase of BLZ, which might be attributed to the lattice distortion and concentration of oxygen vacancies.



This work was supported by the National Natural Science Foundation of China (nos. 11264010, 11564010, 51402196), the Natural Science Foundation of Guangxi (GA139008, 2016GXNSFDA380027), and the China Postdoctoral Science Foundation (Grants 2014M552229 and 2015T80915).


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© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Materials Science and Engineering, College of Mechanical and Control EngineeringGuilin University of TechnologyGuilinChina
  2. 2.Laboratory of Chemical Analysis Elaboration and Materials, Engineering (LEACIM)Université de La RochelleLa Rochelle Cedex 01France
  3. 3.Guangxi Scientific Experiment Center of Mining, Metallurgy and EnvironmentGuilin University of TechnologyGuilinChina

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