Effects of LaFeO3 Additions on the Dielectric and Ferroelectric Properties of (K0.5Na0.5)NbO3 Ceramics

doi:10.3724/SP.J.1077.2012.12325

Abstract

Abstract: Pure (K_0.5Na_0.5)NbO₃ and 0.98(K_0.5Na_0.5)NbO₃-0.02LaFeO₃ ceramics (abbreviated as KNN and 0.98KNN-0.02LF, respectively) were prepared by a solid state reaction approach, and their crystal structure, dielectric and ferroelectric properties were investigated. Pure KNN and 0.98KNN-0.02LF ceramics are the orthorhombic structure and pseudo-cubic perovskite structure, respectively. Dielectric measurements revealed that the dielectric permittivity curves of 0.98KNN-0.02LF ceramics present two anomalies compared with pure KNN: (i) The orthorhombic- tetragonal transition (T_O-T) and the tetragonal-cubic transition (T_T-C) shifts to lower temperatures. (ii) The phase transition temperature range around the temperature of the maximum dielectric permittivity (T_m) becomes more and more broad. In addition, 0.98KNN-0.02LF ceramics exhibited a very stable temperature dependence of dielectric permittivity with permittivity maximum near 2000 and dielectric loss less than 4% in the temperature range of 0–400℃. The relaxation behavior of the 0.98KNN-0.02LF ceramics is interpreted in terms of polar nanoregions (PNRs) caused by cations disorder. The P-E hysteresis loops further confirms the relaxor behavior in 0.98KNN-0.02LF ceramics.

Key words: (K_0.5Na_0.5)NbO₃, dielectric properties, ferroelectric properties, relaxor properties, lead-free ceramics

CLC Number:

TM282

CHENG Hua-Lei, DU Hong-Liang, ZHOU Wan-Cheng, LUO Fa, ZHU Dong-Mei. Effects of LaFeO₃ Additions on the Dielectric and Ferroelectric Properties of (K_0.5Na_0.5)NbO₃ Ceramics[J]. Journal of Inorganic Materials, 2012, 27(11): 1228-1232.

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Effects of LaFeO₃ Additions on the Dielectric and Ferroelectric Properties of (K_0.5Na_0.5)NbO₃ Ceramics

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