Semi-oxalate synthesis of (1-x)BaTiO3-xM0.5Bi0.5TiO3 (M = Li, Na, K) PTCR materials

T. A. PLUTENKO; O. I. V’YUNOV; A. G. BELOUS; O. Z. YANCHEVSKII

doi:10.1007/s40145-016-0180-6

Journal of Advanced Ceramics 2016, 5(2): 117-125 https://doi.org/10.1007/s40145-016-0180-6

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Open Access | Issue | Published: 04 May 2016

Semi-oxalate synthesis of (1-x)BaTiO₃-xM_0.5Bi_0.5TiO₃ (M = Li, Na, K) PTCR materials

Show Author's Information Hide Author's Information T. A. PLUTENKO, O. I. V’YUNOV(

), A. G. BELOUS, O. Z. YANCHEVSKII

Vernadskii Institute of General and Inorganic Chemistry of the Ukrainian NAS, Prospect Palladina 32/34, Kyiv 142 03680, Ukraine

Keywords:

BaTiO₃, lead-free ceramic, semi-oxalate method, positive temperature coefficient of resistance (PTCR) effect

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PLUTENKO TA, V’YUNOV OI, BELOUS AG, et al. Semi-oxalate synthesis of (1-x)BaTiO₃-xM_0.5Bi_0.5TiO₃ (M = Li, Na, K) PTCR materials. Journal of Advanced Ceramics, 2016, 5(2): 117-125. https://doi.org/10.1007/s40145-016-0180-6

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Abstract

(1-x)BaTiO₃–xM_0.5Bi_0.5TiO₃ (M = Li, Na, K) solid solutions were prepared using BaTiO₃ pre-synthesized by oxalate method. The stability limits of (1-x)BaTiO₃–xLi_0.5Bi_0.5TiO₃ solid solutions have been established. It was shown that increase in M_0.5Bi_0.5TiO₃ concentration results in reduction of ceramic grain size in the (1-x)BaTiO₃-xM_0.5Bi_0.5TiO₃ (M = Li, Na, K) system. It was found that the positive temperature coefficient of resistance (PTCR) effect in lead-free materials is due to the presence of a semiconductor core, which is formed by sintering under reducing atmosphere, and dielectric grain boundaries, formed on additional oxidation in air. The use of barium titanate, pre-synthesized by oxalate method, in the synthesis of solid solutions reduced the sintering temperature of ceramics compared with solid state reaction technique. By comparing the electrical properties of the synthesized lead-containing and lead-free materials, it has been shown that lead-free materials exhibit better electrical properties for practical use compared with lead-containing materials.

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Semi-oxalate synthesis of (1-x)BaTiO₃-xM_0.5Bi_0.5TiO₃ (M = Li, Na, K) PTCR materials

Show Author's information Hide Author's Information T. A. PLUTENKO, O. I. V’YUNOV(

), A. G. BELOUS, O. Z. YANCHEVSKII

Vernadskii Institute of General and Inorganic Chemistry of the Ukrainian NAS, Prospect Palladina 32/34, Kyiv 142 03680, Ukraine

Abstract

Keywords: BaTiO₃, lead-free ceramic, semi-oxalate method, positive temperature coefficient of resistance (PTCR) effect

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Publication history

Received: 22 October 2015

Revised: 21 January 2016

Accepted: 22 January 2016

Published: 04 May 2016

Issue date: June 2021

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Acknowledgements

We are grateful to the Centers for Shared Use of Danylo Zabolotny Institute of Microbiology and Virology of Ukrainian NAS and of the Institute of Geological Sciences of Ukrainian NAS for the possibility of electron microscopic and laser diffraction studies.

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