Bismuth sodium titanate (Bi 0.5 Na 0.5 TiO 3 , BNT) with 0-6 at.% lanthanum was prepared by the conventional mixed oxide method. Each composition was calcined at 800-900°C for 2-5 h to form a pure perovskite phase. Green pellets were sintered at 1050-1150°C for 1-4 h to obtain dense ceramics with at least 95% of theoretical density. X-ray diffraction (XRD) showed phase distortion as lanthanum was added to this system. Meanwhile, a small amount of La was found to affect the grain size and had an influence on the poling conditions and electrical properties. The BNTbased composition with 1 at.% La doping provided a dielectric constant (K) of 560, a piezoelectric charge constant (d 33 ) of 92 pC/N, and a hydrostatic piezoelectric coefficient (d h ) of 72 pC/N.
Processingand Electromechanical Properties of (Bi 0.5 Na 0.5 ) (1−−1.5x) LaxTiO 3 Ceramics.-Bi-Na titanate (BNT, Bi 0.5 Na 0.5 TiO 3 ) containing 1-6 at.% La is prepared by a conventional oxide method. Dense ceramics with at least 95 % of the theoretical density are prepared by sintering green pellets at 1050-1150 • C. Small amounts of La 2 O 3 (¡ 2 %) lead to significant improvements in the dielectric, piezoelectric, and electromechanical properties. The BNT-based ceramic with 1 % La doping provides a dielectric constant of 560, a piezoelectric charge constant of 92 pC/N, and a hydrostatic piezoelectric coefficient of 72 pC/N. -(HERABUT, A.; SAFARI, A.; J.
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