B-site-doped BiFeO3-based piezoceramics with enhanced ferro/piezoelectric properties and good temperature stability |
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| Authors: | Yunjing Shi Fei Yan Xia He Kaiwei Huang Bo Shen Jiwei Zhai |
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| Affiliation: | Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Functional Materials Research Laboratory, School of Materials Science & Engineering, Tongji University, Shanghai, China |
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| Abstract: | Here, B-site doped 0.725BiFe0.98M0.02O3-0.275BaTiO3 (M = Fe, Sc, Ga, and Al) + 0.8 mol% MnO2 (abbreviated as BF, BS, BG, and BA) (BFM-BT) ceramics were designed and prepared to modulate octahedral distortions. According to bond-valence calculations based on XRD Rietveld refinement data, B-site doped BFM-BT ceramics tended to have a higher distortion as the radius of the doping ion decreases, and obtained a great improvement of ferroelectric and piezoelectric performances. B-site-doped BFM-BT ceramics significantly inhibited the formation of impurities, leading to better ferroelectric and piezoelectric performances. The BFM-BT ceramics exhibited high Curie temperature of 519-530℃ and good temperature stability for piezoelectric performances. The d33 values of BF, BS, and BA ceramics remained the room temperature value ranging from room temperature to 470℃. Meanwhile the content of impure phases, oxygen vacancies and valence of Fe3+ to Fe2+ decreased with the decreasing radii of B-site doping ions. |
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| Keywords: | BiFeO3-BaTiO3 octahedral distortion temperature stability the dipole moment |
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