Abstract
CaBi2Nb2O9 ceramic is a promising candidate for high‐temperature piezoelectric applications due to its high Curie temperature. However, extremely low piezoelectric properties hinder its application. A combination of Sm3+ donor doping and texturing was applied to address this problem. Piezoelectric coefficient, Tc, and resistivity of textured Ca0.95Sm0.05Bi2Nb2O9 ceramics (d33 = 23pC/N, Tc = 941°C, ρ = 4.1 × 105Ω cm at 600°C) were obviously higher than those of pure random CaBi2Nb2O9 ceramics (d33 = 6, Tc = 930°C, ρ=0.6 × 105Ω cm at 600°C). Furthermore, it had excellent resistance to depolarization property, with kp of about 5.9% until 600°C.
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