Authors
Myang Hwan Lee, Hae In Choi, Da Jeong Kim, Sang Woo Lee, Yu Bin Park, Sang Mo Yang, Tae Kwon Song
Published in
ACS applied materials & interfaces. May 06, 2025. Epub May 06, 2025.
Abstract
Lead-free BiFeO3-BaTiO3 (BF-BT) ceramics show high potential for piezoelectric sensors, actuators, and high-power transducers owing to their excellent piezoelectric properties and high Curie temperatures (TC). Hard piezoelectric material used in high-power transducer applications must exhibit a high mechanical quality factor (Qm), high coercive field (EC), high TC, and low dielectric loss (tan δ). Herein, the effects of doping in BF-BT ceramics with the hard acceptor dopant Mn2+ are investigated to enhance their hard piezoelectric properties. The 0.8Bi1.02(Fe1-xMnx)O3-0.2BaTiO3 (x = 0, 0.005, 0.01, 0.015, and 0.02) ceramics are prepared using solid-state reaction and water-quenching processes. The increasing of the Mn2+ content in BF-BT ceramics boosts the piezoelectric charge sensor coefficient (d33), Qm, TC, planar piezoelectric coupling factor (kp), EC, and internal bias field (Ei), reaching their maximum values at x = 0.01 (d33 = 74 pC/N, Qm = 757, TC = 652 °C, kp = 0.26, EC = 65 kV/cm, and Ei = 6.2 kV/cm) with the lowest loss (tan δ = 0.009). Then, the hard piezoelectric properties deteriorate gradually with an increasing Mn content. The ferroelectric domain structure and dynamics are compared to defect-related ferroelectric and piezoelectric properties. These results show that the hard acceptor Mn2+ in the BF-BT ceramics improves the performance of lead-free ceramics for high-power piezoelectric transducers in high-temperature environments.
PMID:
40327770
Bibliographic data and abstract were imported from PubMed on 07 May 2025.
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