Effect of A-site off-stoichiometry on ferroelectric and piezoelectric properties of BaTiO3–Bi(Mg1/2Ti1/2)O3–BiFeO3 ceramics

摘要

Mn-added 0.3BaTiOsub3/sub–0.1Bi subx/sub (Mgsub1/2/subTisub1/2/sub)Osub3/sub–0.6BiFeOsub3/sub ( x = 0.93, 0.96, 1.00, 1.04, 1.07, and 1.10) ceramics were fabricated by conventional solid-state reaction. The crystal systems of all the ceramics were pseudo-cubic, and no secondary phase was observed. It was found that the ceramics with x = 1.00 exhibited an optimum piezoelectric property of d sub33/sub = 106.16 pC/N, while the Bi-deficient and excess ceramics lowered the piezoelectric properties to 81.09 and 102.29 pC/N, respectively. The reason of the decreases could be associated with domain wall pinning effects by defect complexes and the presence of the residual small amount of Bisub2/subOsub3/sub.