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Enhancement of Piezoelectric Properties in Lanthanum-Modified Pb(Mg1/3Nb2/3)O3-PbTiO3 Ceramics via Spontaneous Relaxor-to-Ferroelectric Transition
Y. Wang, C. Chen, S. Qian, X. Zhang
State Grid Smart Grid Research Institute Co., Ltd., Beijing, China, 102209
received September 20, 2022, received in revised form October 23, 2022, accepted October 25, 2022
Vol. 13, No. 2, Pages 121-126 DOI: 10.4416/JCST2022-00009
Abstract
In relaxor ferroelectrics, spontaneous relaxor-to-ferroelectric transition has attracted much attention due to its unique performance. However, despite extensive studies over several decades, the effect of spontaneous relaxor-to-ferroelectric transition on the piezoelectric, dielectric and ferroelectric properties of relaxor ferroelectrics remains obscure. In this work, the piezoelectric, dielectric and ferroelectric properties of 12 % La-modified Pb(Mg1/3Nb2/3)O3-xPbTiO3 ceramics, which exhibit spontaneous relaxor-to-ferroelectric transition with a wide composition range (0.44 ≤ x ≤ 0.51), were systematically investigated. It has been found that the spontaneous transition composition with x = 0.48 shows enhanced piezoelectric, dielectric and ferroelectric properties compared to the adjacent compositions. The x = 0.48 composition has a piezoelectric coefficient d33 of 235 pC/N, accompanied by a high relative permittivity (up to 12230) and a high maximum polarization (up to 20.4 μC/cm2). This enhancement effect originates from the easy polarization rotation induced by its instability state and the coexistence of micro-sized domain and polar nanodomain configuration. Our work may provide new insights into the exploration of the mechanism that enhances the piezoelectric, dielectric, and ferroelectric properties of relaxor ferroelectric materials.
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Keywords
Relaxor ferroelectric, spontaneous transition, piezoelectric property, dielectric property, ferroelectric property
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