镧掺杂80PMN-20PT弛豫铁电陶瓷的透过率与电光性能

doi:10.15541/jim20260154

摘要/Abstract

摘要： 可见-近红外宽波段电光调制在光通信、光电信号处理和成像技术中具有重要应用。目前,关于高电光性能的铌镁酸铅-钛酸铅(PMN-PT)透明弛豫铁电陶瓷在不同红外波段的电光系数及其微观物理机制的研究仍较为有限。本研究以镧掺杂80PMN-20PT透明陶瓷为研究对象,开展多波长透过率和二次电光响应研究。结果显示, 在632.8~1550 nm波段,样品的二次电光系数随波长增加而缓慢升高,在1550 nm处达到40.4×10^-16 m²/V²。压电力显微镜结果表明,样品中局域畴结构的特征尺度约为200 nm,并在局部区域观察到亚微米级电畴。通过对比极化前后样品的介电常数和损耗温谱可知,低温区未观察到明显的玻璃化特征,说明局域畴结构在透过率和电光性能测试所处温度附近能够保持稳定,且样品在35~45 ℃范围内出现频率色散,极化前Burns温度(T_B)约为100 ℃。同时,样品在电场作用下表现出高诱导极化和低极化滞后的弛豫铁电特性(P_max=23.8 μC/cm²,P_r=5.1 μC/cm²)。上述结果表明,样品透过率和二次电光系数随波长增加而升高的现象,与其局域极化结构及低场可逆极化响应密切相关。

关键词: PMN-PT透明陶瓷, 弛豫铁电体, 畴结构, 电光系数, 可见-近红外光谱

Abstract: Broadband electro-optic modulation spanning the visible-to-near-infrared range is critical for optical communication, optoelectronic signal processing, and imaging. Studies on the electro-optic coefficient and microscopic mechanism of high-electro-optic lead magnesium niobate-lead titanate (PMN-PT) transparent relaxor ferroelectric ceramics across different infrared wavelength ranges remain limited. In this work, La-doped 80PMN-20PT transparent ceramics were used to study multi-wavelength transmittance and quadratic electro-optic response. Over the wavelength range from 632.8 nm to 1550 nm, the quadratic electro-optic coefficient increased gradually with wavelength, reaching 40.4×10^-16 m²/V² at 1550 nm. Piezoresponse force microscopy results showed that local domain structures with a characteristic size of approximately 200 nm were observed, as well as submicron domains in certain local regions. The dielectric permittivity and dielectric loss spectra of both unpoled and poled samples exhibited no obvious glassy features in the low-temperature region, indicating that the local domain structure remains stable within the temperature range used for transmittance and electro-optic measurements. Frequency dispersion was observed between approximately 35 and 45 ℃, and the T_B before polarization was about 100 ℃. The sample also showed typical relaxor ferroelectric behavior under electric field, characterized by high induced polarization and low polarization hysteresis (P_max=23.8 μC/cm², P_r=5.1 μC/cm²). These results indicate that the increase in transmittance and quadratic electro-optic coefficient with wavelength is closely related to the local polar structure and its reversible low-field polar response.

Key words: PMN-PT transparent ceramic, relaxor ferroelectric, domain structure, electro-optic coefficient, visible-near-infrared spectroscopy

中图分类号:

TQ174

赵世盟, 凌紫琼, 王振伟, 满振勇, 郑嘹赢, 曾华荣, 李国荣. 镧掺杂80PMN-20PT弛豫铁电陶瓷的透过率与电光性能[J]. 无机材料学报, DOI: 10.15541/jim20260154.

ZHAO Shimeng, LING Ziqiong, WANG Zhenwei, MAN Zhenyong, ZHENG Liaoying, Zeng Huarong, LI Guorong. Optical Transmittance and Electro-optic Properties of La-doped 80PMN-20PT Relaxor Ferroelectric Ceramics[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20260154.

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