Dielectric, Ferroelectric, and Piezoelectric Properties of BiFeO 3 –BaTiO 3 Ceramics
Journal of the American Ceramic Society2013Vol. 96(10), pp. 3163–3168
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Abstract
Perovskite solid solution ceramics of (1 − x ) BiFeO 3 – x BaTiO 3 (1 − x ) BF – x BT , 0.2 ≤ x ≤ 0.45) with high electrical resistivity were prepared by solid‐state reaction method. Actual ferroelectric hysteresis loops and temperature dependence of dielectric constant of the ceramics were obtained. Ceramics of 0.7 BF –0.3 BT with small rhombohedral distortion show highest remnant polarization ( P r = 26.0 μC/cm 2 ) and piezoelectric coefficient ( d 33 = 134 pC/N). Compositions with pseudo‐cubic symmetry (intermediate phases) show relaxor‐like dielectric anomaly. The values of P r and d 33 decrease with increasing BT content, from 24.8 μC/cm 2 and 104 pC/N for 0.65 BF –0.35 BT to 8.2 μC/cm 2 and 5 pC/N for 0.55 BF –0.45 BT .
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