WANG Xianwen, JIANG Xiangping, HUANG Xiaokun, NIE Xin, CHEN Chao,XU Jingdong, WANG Jun, YANG Liqiang

(School of Materials Science and Engineering, Jiangxi Key Laboratory of Advanced Ceramic Materials, Jingdezhen Ceramic University, Jingdezhen, 333403, Jiangxi, China)

Abstract: Crystal structural and electrical properties of manganese doped bismuth barium titanate BaBi₈Ti₇O₂₇ lead-free piezoelectric ceramics have been studied. The BaBi₈Ti₇O_27-xMnCO₃ (x=0, 0.015, 0.03, 0.06, 0.12, 0.16, 0.20 wt.%) ceramics were prepared using the conventional solid reaction method. All the samples were of single phase, while the grains were well developed and the doping MnCO₃ promoted the grain growth of the ceramics. The acceptor doping in the ceramics resulted in a decrease in electrical conductivity and an increase in the energy activity. The sample with 0.16 wt.% Mn had a coefficient (d₃₃) of 22.8 pC/N, which was much higher than that (6.7 pC/N) of the undoped one by more than three times.

Key words: crystal structure; electrical property; piezoelectric coefficient; electrical conductivity