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Influence of non-stoichiometry on the ferroelectric aging properties of Mn-doped BaTiO3 ceramics

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Abstract

In the present work, the effect of the non-stoichiometry on the dielectric and ferroelectric properties especially the aging phenomenon of Bam(Ti0.995Mn0.005)O3 ceramics is studied. With the A/B site stoichiometry ratio m increased from 0.990 to 1.010, the Curie temperature is decreased from 128 to 118 °C monotonically. The non-stoichiometry shows the dramatic effect on the aging phenomenon of the Mn-doped BaTiO3 ceramics. As the aged sample with m < 1, an obvious constriction of hysteresis loop and recoverable electro-strain curve are observed. With m increased to 0.997, the recoverable electro-strain shows the highest value of 0.17%, whereas for the m > 1 samples, it shows the normal hysteresis loop and electro-strain curve as the un-aged samples. The valence state analysis of Mn ions shows that for the m < 1 and m = 1 samples only Mn2+ ions exist, while for the m > 1 samples Mn2+ and Mn4+ ions co-exist. Moreover, with m decreasing, the amount of Mn2+ ions increases. It is proposed that the non-stoichiometry affects the valence state of Mn ions, which causes the number of oxygen vacancies to change, ultimately affecting the aging effect of the Mn-doped BaTiO3 ceramics.

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Acknowledgements

This research was supported by the Natural Science Foundation of China (Grant number 51707177).

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Authors and Affiliations

  1. School of Electrical Engineering, Xi’an Jiaotong University, Xi’an, 710049, China

    Wei Chen & Xia Zhao

  2. High Voltage Department, China Electric Power Research Institute, Beijing, 100192, China

    Xia Zhao

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Correspondence to Xia Zhao.

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Chen, W., Zhao, X. Influence of non-stoichiometry on the ferroelectric aging properties of Mn-doped BaTiO3 ceramics. Appl. Phys. A 125, 109 (2019). https://doi.org/10.1007/s00339-019-2405-3

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