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Synthesis, Phase Evolutions, and Properties of the Perovskite Ba₆Ca₂Ti₂Nb₃O_19.5

Zh. Pan, H. Wei, J. Xu, L. Fang, X. Kuang

Journal of Ceramic Science and Technology, Vol. 14, No. 1 (2023), pp. 25-30

DOI: 10.4416/JCST2022-00013

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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.

Keywords

Ba6Ca2Ti2Nb3O19.5, simple cubic perovskite, B-site disorder, high permittivity, alternating current impedance.

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