Effect of LiF addition on phase structure and piezoelectric properties of (Ba, Ca)(Ti, Sn)O3 ceramics sintered at low temperature. Issue 3 (April 2015)

• Record Type: Journal Article
• Authors: Zhou, Peng-Fei; Zhang, Bo-Ping; Zhao, Lei; Zhu, Li-Feng
• Is Part Of: Ceramics international. Volume 41:Issue 3(2015)Part A
• Page Start: 4035
• Page End: 4041
• Publication Date: 2015-04
• Subjects: C. Piezoelectric properties -- BCTS -- LiF addition -- Low-temperature sintering; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2014.11.094
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this study, a series of (Ba0.95 Ca0.05 )(Ti0.90 Sn0.10 )O3 – 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.