Abstract
Lead-free ferroelectric ceramics are widely researched today for industrial applications as sensors, actuators and transducers. Since Pb(Zr a Ti 1-a )O₃(PZT) has high Curie temperature (TC), high piezoelectric properties near its morphotropic phase boundary (MPB) composition and small temperature dependence electrical behavior, it has been used to commercial materials for wide temperature range and different application fields. According to the tolerance factor concept, since the Bi 3+ cation with 12-fold coordinate has a smaller ionic radius than 12-fold coordinate Pb 2+ , most bismuth based perovskites possess a smaller tolerance factor. Therefore, MPBs with a higher TC may be expected in Bi(Me 3+ )O₃-PbTiO₃ solid solutions. As in lead based perovskite systems, it is clear that we need to explore more materials in simple or complex bismuth based MPB systems. The objective of this study is to investigate the Bi(Ni 1-a X a )O₃-PbTiO₃ (X=Ti 4+ , Nb 5+ ) perovskite solid-solution. For improving the electronic conduction problem, the magnesium and manganese modified system was also studied.
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