Abstract
The microstructure and dielectric properties of LaMnO3 (LM) doped BaTiO3 (BT) ceramics have been investigated. By adding LM, (1–x)BT-xLM (x = 0–0.5) ceramics keep in a single-phase solid-solution state, but gradually transform from tetragonal structure to pseudocubic one, and much denser microstructure is obtained. As for dielectric properties, when x ≤ 0.1, the Curie temperature of BT-LM shifts to a lower temperature and the permittivity maximum is lowered with the increase of LM content, which are attributed to the introduction of La2O3 and the degradation of tetragonality, respectively. When x > 0.1, BT–LM presents a typical relaxation behavior. Colossal permittivity appears as x reaches 0.4, which is related to large number of giant electron-pinned defect-dipoles (\({\text{Mn}}^{4 + } \cdot 2e - V_{\text{O}}^{ \cdot \cdot }\)) and existence of grain-boundary segregation. Detailed analyses show that 0.5BT–0.5LM possesses the highest permittivity maximum (41,683) and widest temperature range (– 42 to 300 °C) with permittivity larger than pure BT at 100 kHz. Therefore, 0.5BT–0.5LM can be a very promising candidate as colossal permittivity material.
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This work was supported by the Natural Science Foundation of China (Grant No. 51702363).
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Yang, J., Mao, H., Chen, X. et al. Investigation of microstructure and dielectric properties of LaMnO3 doped BaTiO3 ceramics. J Mater Sci: Mater Electron 30, 18227–18233 (2019). https://doi.org/10.1007/s10854-019-02177-0
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DOI: https://doi.org/10.1007/s10854-019-02177-0