Phase Development and Dielectric, Ferroelectric and Piezoelectric Properties of Pb(Mg_1/3Nb_2/3)_0.9Ti_0.1O₃-Bi_0.5(Na_0.74K_0.26)_0.5TiO₃ Ceramics

Abstract

In this work, the relationships between phase development and the properties of a new relaxor based ferroelectric (1-x)Pb(Mg_1/3Nb_2/3)_0.9Ti_0.1O₃-xBi_0.5(Na_0.74K_0.26)_0.5TiO₃ ceramics (when x = 0.0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1.0 mole fraction) was studied. The pseudo-cubic structure was observed in the ceramics with x ≤ 0.7 mole fraction. The rhombohedral and tetragonal phases were found to coexist when x increased to 0.9, which transformed into the single tetragonal phase when x increased to 1.0. The dielectric constant measured at room temperature decreased with increasing x. The remnant polarization and piezoelectric constant of the ceramics significantly increased when x increased to 0.9 and 1.0.

• Keywords PMNT-BNKT; phase; dielectric; ferroelectric; piezoelectric

Funding

This work was supported by Chiang Mai University and the Thailand Research Fund (TRF, Grant No. RSA5780032). This work was partly supported by the United States Office of Naval Research (ONR, Grant No. N00014-12-1-1045) and the Natural Science and Engineering Research Council of Canada (NSERC). The work performed at XJTU was supported by the Natural Science Foundation of China (Grant Nos. 50728201 and 90923001), the International Science & Technology Cooperation Program of China (Grant No. 2011DFA51880), the “111 Project” of China (Grant No. B14040).