极化调控PIN-PMN-PT铁电单晶压电性能的均匀性

摘要/Abstract

摘要： 弛豫铁电单晶具有优异的压电性能,在医学超声换能器、水声器件等领域有重要应用。坩埚下降法生长的弛豫铁电单晶不可避免地存在组分偏析,导致材料利用率极低。本工作测试了0.24PIN-0.46PMN-0.30PT铁电单晶沿生长方向压电系数(d₃₃)和介电常数(ε₃₃^T/ε₀)的变化,结果显示d₃₃和ε₃₃^T/ε₀沿着生长方向变化极大,能保持性能接近的区域不足20 mm。通过针对不同区域的极化设计,对铁电-铁电相变温度接近的区域进行极化调控,使超过60%晶体部分的d₃₃和ε₃₃^T/ε₀分别维持在(1 500±140) pC·N^-1和4 900±350。为了验证极化调控后的晶体谐振区域是否一致,测试了两端区域的k₃₃振子的谐振谱,结果显示两者的机电耦合系数接近,谐振和反谐振的峰位置也接近,而且不存在额外的寄生振动,说明采用极化调控PIN-PMN-PT铁电单晶沿生长方向的均匀性是可行的。本工作为提高PIN-PMN-PT铁电单晶的利用率提供了一种参考方案。

关键词: PIN-PMN-PT, 铁电单晶, 极化调控, 组分分凝, 压电系数

Abstract: Relaxor ferroelectric single crystals have important applications in medical ultrasound transducers, hydroacoustic devices and other fields due to their excellent piezoelectric properties. The relaxor ferroelectric single crystals grown by the Bridgman method inevitably suffers from component segregation, resulting in extremely low utilization. In this work, the variation of piezoelectric coefficient (d₃₃) and dielectric constant (ε₃₃^T/ε₀) of 0.24PIN-0.46PMN-0.30PT ferroelectric single crystals along the growth direction were tested. The results show that d₃₃ and ε₃₃^T/ε₀ are extremely variable along the growth direction, with less than 20 mm of the region maintaining close performance. Polarization modulations were applied in different regions with close ferroelectric-ferroelectric phase transition temperatures through different polarization designing. The d₃₃ and ε₃₃^T/ε₀ of more than 60% region of the crystalline maintain in the range of (1 500±140) pC·N^-1 and 4 900±350, respectively. In order to verify the consistency of the resonance peaks of the crystal after polarization modulation, the resonance spectra of the k₃₃ vibrators in the two end regions were tested. The results show that the electromechanical coupling coefficients are close to each other, and the peak positions of resonance and anti-resonance are also close to each other. Importantly, there don’t exist additional spurious-mode vibrations. These demonstrate the feasibility of employing polarization modulation to regulate the uniformity of the PIN-PMN-PT ferroelectric single crystals along the growth direction. This work provides a reference solution to improve the utilization of PIN-PMN-PT ferroelectric single crystals.

Key words: PIN-PMN-PT, ferroelectric single crystal, polarization modulation, component segregation, piezoelectric coefficient

中图分类号:

O78
O738

梁敏, 熊瑞彬, 陈淑丽, 王祖建, 苏榕冰, 苏彬, 刘颖, 何超. 极化调控PIN-PMN-PT铁电单晶压电性能的均匀性[J]. 人工晶体学报, 2024, 53(6): 953-958.

LIANG Min, XIONG Ruibin, CHEN Shuli, WANG Zujian, SU Rongbing, SU Bin, LIU Ying, HE Chao. Uniformity of Piezoelectric Properties of PIN-PMN-PT Ferroelectric Single Crystals Modulated by Polarization Technique[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2024, 53(6): 953-958.

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