Abstract
High-temperature Pb-free ceramics of 0.72BiFe0.99Al0.01O3–0.28BaTi1−xZrxO3 (BFA–BZxT) have been prepared through solid state reaction route. The influence of the Zr4+ substitution for Ti4+ on microstructure, thermal stability and electrical properties of the BFA–BZxT ceramics was investigated. The results showed single-phase solid solutions occurred for compositions x=0–0.12 and a morphotropic phase boundary (MPB) separating rhombohedral and pseudocubic phases existed near x=0.03. The substitution of Zr4+ for Ti4+ caused significant change of grain size for BFA–BZxT ceramics. The optimum piezoelectric properties of d33=157pC/N, kp=0.33, combined with improved depoling temperature Td=425°C, are obtained around the MPB composition of x=0.03. The results indicate that BFA–BZxT ceramics have a great potential to apply in high temperature field.
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