1. Role of Cu and Y in sintering, phase transition, and electrical properties of BCZT lead-free piezoceramics.
- Author
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Wu, Yinghong, Ma, Fei, Qu, Jingkui, Luo, Yang, Song, Jing, Wei, Guangye, Zhang, Yingchun, and Qi, Tao
- Subjects
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SINTERING , *PHASE transitions , *MICROSTRUCTURE , *SOLID state physics , *PIEZOELECTRIC ceramics - Abstract
Lead-free (Ba 0.85 Ca 0.15 )(Ti 0.9 Zr 0.1 )O 3 -xwt%CuOywt%Y 2 O 3 (BCZT-Cu x Y y ) ceramics with high piezoelectricity were synthesized by the conventional solid-state reaction method. The role of Cu and Y (Cu/Y) in sintering, phase transition, and electrical properties of such ceramics was systematically studied. The results indicated that the sintering temperatures of BCZT-Cu x Y y decreased by at least 100 °C due to the low melting point of CuO. The promotion effect of Cu/Y on phase transition lied in the improvement of T C by 5–15 °C and the coexistence of O+T phase near room temperature. The contribution of Cu/Y to electrical properties was mainly ascribed to the grains growth, the formed oxygen vacancies and lattice distortions, and the donor doping effect of Y 3+ . Adding 0.10 wt% Cu 2+ and 0.06 wt% Y 3+ into BCZT dramatically improved the electrical properties as following: d 33 = 552 pC/N, ε m = 10175, ε r = 4546, tanδ = 0.016, T C = 100 °C, k p = 0.475, Q m = 157.2, P r = 10.82 μC/cm 2 and E C = 2.33 kV/cm. A plausible mechanism was obtained to explain the reaction process and the favorable performances of BCZT-Cu x Y y . Co-doping Cu 2+ and Y 3+ into BCZT could be a promising method to improve and balance the sintering, phase transition, and electrical properties for potential practical applications of lead-free piezoceramics. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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