1. Effect of LiF addition on phase structure and piezoelectric properties of (Ba,Ca)(Ti,Sn)O3 ceramics sintered at low temperature.
- Author
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Zhou, Peng-Fei, Zhang, Bo-Ping, Zhao, Lei, and Zhu, Li-Feng
- Subjects
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LITHIUM fluoride , *ADDITION reactions , *PIEZOELECTRIC materials , *BARIUM compounds , *CERAMIC metals , *SINTERING , *METALS at low temperatures - Abstract
In this study, a series of (Ba 0.95 Ca 0.05 )(Ti 0.90 Sn 0.10 )O 3 – x LiF (BCTS– x LiF) (0≤ x ≤6 mol%) lead-free piezoceramics were fabricated by a conventional solid-state reaction method. The incorporation of LiF could significantly improve the sinterability of BCTS ceramics by reducing the sintering temperature from 1480 °C to 1250 °C, where a relative density over 90% was achieved with grown grains of 5–20 μm. X-ray diffraction and Raman spectroscopy experiments revealed that BCTS– x LiF ceramics are composed of coexisting R – O – T phases at 0≤ x ≤1 and R – T phases at 2≤ x ≤6 at room temperature. Optimal piezoelectric properties of d 33 =510 pC/N, k p =40.9%, ε r =5370, tan δ =0.019 and d S /d E =961 pm/V were obtained at x =5, which is attributed to the coexistence of R and T phases with an optimum ratio at room temperature and dense structure with large grains. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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