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Tunable phase transition in (Bi0.5Na0.5)0.94Ba0.06TiO3 by B-site cations

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Abstract

The role of B-site ions of Bi0.5Na0.5TiO3 (BNT) on its complex phase transition remains unclear due to its polarization attributing to both Bi and Ti. In this paper, the phase transition of (Bi0.5Na0.5)0.94Ba0.06(Ti1−0.01b/4B0.01)O3 (BNT6BT) (B = Nb, Mn, Fe, and Cu) ceramics was modified by low-concentration donor doping (Nb) and acceptor doping (Mn, Fe, and Cu) in order to determine the origin of phase transition behavior. The phase structure, microstructure, local structure/lattice vibration, phase transition temperature, and dielectric properties of BNT6BT-Nb, Mn, Fe, and Cu ceramics were investigated. Results showed that all samples formed a single perovskite phase at room temperature, and donor (Nb) and acceptor (Mn, Fe, and Cu) doping can regulate the ratio of R3c and P4bm coexisting as nanoscale entities. The grains show polyhedral morphology, and average grain size lies between 1 and 2 μm. The Raman spectroscopy study shows that doping modification can change the phase transition temperature. The relation is in well agreement with the three different dielectric anomalies derived from the dielectric curves of εr versus T. Low concentration of cation (Nb, Mn, Fe, and Cu) doping can tailor the dielectric permittivity, depolarization temperature, and phase transition temperature of BNT6BT. All samples exhibit a large dielectric constant and good frequency stability.

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Acknowledgments

This work was financially supported by the Natural Science Foundation of Guangxi (Grant Nos. AA138162, and AA294014), and High Level Innovation Team and Outstanding Scholar Program of Guangxi Institutes.

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  1. MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi University Key Laboratory of Nonferrous Metal Oxide Electronic Functional Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, Guangxi, People’s Republic of China

    Wenhao Liu, Xin Ma, Shaokai Ren, Xiuyun Lei & Laijun Liu

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  1. Wenhao Liu
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Liu, W., Ma, X., Ren, S. et al. Tunable phase transition in (Bi0.5Na0.5)0.94Ba0.06TiO3 by B-site cations. Appl. Phys. A 126, 269 (2020). https://doi.org/10.1007/s00339-020-3448-1

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