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Redox behavior and electrical properties of Sr and Zr substituted BaTiO3

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Abstract

The oxidation and reduction behavior of Sr and Zr substituted BaTiO3 has been studied by measuring equilibrium electrical conductivities as a function of oxygen activity. The substitution of Sr+2 and Zr+4 for Ba2+ and Ti4+ in BaTiO3 shifted the conductivity profiles to lower oxygen partial pressures. The replacement of Ba with smaller Sr ions suppresses the oxygen dissociation from the lattice, consequently increasing the enthalpy for reduction (ΔH n ), whereas the Sr substitution requires less energy for oxidation (ΔH p ). The increase in reduction enthalpy at lower oxygen activities suppresses the formation of oxygen vacancies, the materials becoming resistant to reduction process. Such a reduction resistant behavior gave rise to greater electrical resistivities for (Ba0.9Sr0.1)(Ti0.9Zr0.1)O3 than for Ba(Ti0.9Zr0.1)O3 when the samples were sintered at lower P(O2).

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Acknowledgments

This research was supported by Basic Science Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2012005990).

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Authors and Affiliations

  1. Department of Materials Engineering, Sungkyunkwan University, 300 Chonchon-Dong, Jangan-Gu, Suwon, 440-746, Korea

    Soo Kyong Jo, Sung Hyung Kang & Young Ho Han

  2. Samsung Electromechanics, Suwon, Korea

    Sung Hyung Kang

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  1. Soo Kyong Jo
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  2. Sung Hyung Kang
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  3. Young Ho Han
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Correspondence to Young Ho Han.

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Jo, S.K., Kang, S.H. & Han, Y.H. Redox behavior and electrical properties of Sr and Zr substituted BaTiO3 . J Electroceram 31, 189–193 (2013). https://doi.org/10.1007/s10832-013-9836-6

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  • DOI: https://doi.org/10.1007/s10832-013-9836-6

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