Abstract
ABSTRACT Different manganese oxides-doping effects were compared in piezoceramic BiFeO3-BaTiO3 system. 0.67Bi1.05(Fe0.99Mnx0.01)O3-0.33BaTiO3 (valence state x = 4+, 3+, and 2+) ceramics were prepared via a solid-state reaction process followed by furnace-cooling (FC) or water-quenching (WQ) process. For the FC ceramics, the direct piezoelectric sensor coefficient (d33) was almost independent of valence state of doped Mn, while d33 depended on the fraction of Fe3+/Fe2+ in WQ ceramics. The d33 value was highest for the donor Mn4+-doped ceramic, among the FC ceramics, with 175 pC/N. However, acceptor-doping with Mn2+ prevented the transition of Fe ion valence state from 3+ to 2+ in the WQ ceramics, the Mn2+-doped WQ ceramic showed the largest d33 of 313 pC/N and converse piezoelectric actuator coefficient, d33* of 352 pm/V, with high Curie phase transition temperature (482 °C).
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