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Synthesis, Phase Evolutions, and Properties of the Perovskite Ba6Ca2Ti2Nb3O19.5
Zh. Pan, H. Wei, J. Xu, L. Fang, X. Kuang
MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials; Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices; College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
received December 16, 2022, received in revised form Febuary 2, 2023, accepted Febuary 2, 2023
Vol. 14, No. 1, Pages 25-30 DOI: 10.4416/JCST2022-00013
Abstract
In the present study, Ba6Ca2Ti2Nb2+xO17+2.5x (BCTN, x ≤ 1.0) materials were synthesized with the traditional solid-state reaction method. The phase evolution, structure, relative permittivity, and electrical conduction properties of these materials were studied. The results revealed that increasing the Nb content and improving the calcining temperature favored the formation of a pure simple cubic perovskite structure. For the end member of Ba6Ca2Ti2Nb2+xO17+2.5x, i.e. Ba6Ca2Ti2Nb3O19.5, Rietveld structural refinement disclosed that about 25 % Ca ions and all the Ba ions occupied the A site, while the remaining cations were disordered and occupied the B site. Thus, it can also be written as (Ba6Ca0.5)(Ca1.5Ti2Nb3)O19.5. This material exhibited high permittivity up to 80 and the electrical conductivity was 1.33×10-4 S/cm at 800 °C which was dominated by electronic conduction.
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Keywords
Ba6Ca2Ti2Nb3O19.5, simple cubic perovskite, B-site disorder, high permittivity, alternating current impedance.
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