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Piezoelectric Properties of BaTiO 3 –(Bi 1/2 K 1/2 )TiO 3 Ferroelectric Ceramics

2004; Institute of Physics; Volume: 43; Issue: 11A Linguagem: Inglês

10.1143/jjap.43.7556

1347-4065

Yuji Hiruma, Rintaro Aoyagi, Hajime Nagata, Tadashi Takenaka,

Multiferroics and related materials

The dielectric, ferroelectric and piezoelectric properties of barium titanate (BaTiO3)-based solid solution, (1-x)BaTiO3–x(Bi1/2K1/2)TiO3 (0≤x≤1) (BT–BKT100x), a candidate lead-free piezoelectric ceramic, were studied using a starting material of fine BaTiO3 powder. The Curie temperature, Tc, of the BT–BKT ceramics shifted to higher temperatures than those of BT with increasing the amount (x) of (Bi1/2K1/2)TiO3 and Tc was higher than 200°C at x=0.2. Electromechanical coupling factor, k33, and piezoelectric constant, d33, were 0.37 and 75.8 pC/N for BT–BKT20 + MnCO3 (0.1 mass%), and 0.40 and 100 pC/N for BT–BKT5 + MnCO3 (0.1 mass%), respectively.