Small-signal piezoelectric properties on Mn-doped BiFeO–BaTiO lead-free piezoelectric ceramics
Journal of the Ceramic Society of Japan, ISSN: 1348-6535, Vol: 132, Issue: 7, Page: 339-345
2024
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Article Description
Small-signal piezoelectric characteristics in pseudo-cubic BiFeO–BaTiO-based ceramics are rarely studied. In this study, the xMnO-doped 0.67BiFeO–0.33BaTiO (BF33BT–xMn, x = 0.0, 0.2, 0.4, and 0.6 wt %) ceramics are investigated. Small and large amounts of Mn ions play different roles in resistivity, with the highest resistivity observed at a MnO content of 0.2 wt %. The examination of poling conditions revealed the impact of electric field strength and poling time on impedance phase ª. The piezoelectric constant (d) and electromechanical coupling factor (k) increase with impedance phase ª, while the mechanical quality factor (Q) value remains unchanged. Our finding indicates that poled BF33BT–0.2Mn ceramic reaches an impedance phase ª of 73°, k of 0.45, Q of 41.0, and d © Q value of 3856 pC/N. This study contributes to further research on the high-power piezoelectric characteristics of lead-free BiFeO–BaTiO-based ceramics.
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