Si trova su / Altri legami
© 2021 The American Ceramic SocietySrTiO3–modified lead–free piezoelectric ceramics, (0.93–x)Bi0.5Na0.5TiO3–xSrTiO3–0.06BaTiO3–0.01 K0.5Na0.5NbO3 [(BNT–xST)–BT–KNN, x = 0–0.06], were prepared using a conventional solid–state reaction method. The XRD structure analysis and electric properties characteristics revealed the ST–induced phase transformation from the ferroelectric phase to the relaxor phase and their coexistence state. Benefiting from the ST–destructed ferroelectric long–range orders, the high normalized strain value of 600 pm/V was obtained in the (BNT–0.02ST)–BT–KNN ceramic at 5 kV/mm. The ST–generated relaxor phase was found to have a constructive effect on improving the temperature stability and restraining the hysteresis of the electric–field–induced strain. The normalized strain of (BNT–0.06ST)–BT–KNN ceramics could be kept at a high value ~337 pm/V at elevated temperature up to 120°C.
