PLZT透明陶瓷的微区组分调控及梯度设计与电光性能研究

摘要/Abstract

摘要： 镧掺杂锆钛酸铅(PLZT)透明陶瓷因其优异的光学透明性和电光效应,在现代光通信和高能激光技术等领域具有重要应用前景。然而PLZT透明陶瓷的电光性能对环境温度变化非常敏感,增加了其在宽温度范围电光调制器中的应用难度。本文围绕PLZT(10/65/35)透明陶瓷开展了材料铁电、介电及电光性能随温度变化的相关研究,通过对关键掺杂离子La³⁺含量的微区调控和构建一定分布梯度,改善材料的电光性能及其温度稳定性。通过传统氧气氛热压烧结获得系列纯钙钛矿相结构的PLZT陶瓷,材料显微结构均匀致密;所有样品均呈现良好的光学透过率(52%~60%,λ=632.8 nm);随着La³⁺含量微量增加,PLZT陶瓷的介电峰谱弛豫性增大,同时微区La³⁺组分波动性增强的0-3复合和2-2复合PLZT陶瓷的介电温谱谱峰显著展宽且介电常数峰值提高;随温度的升高,陶瓷样品的铁电电滞回线(P-E)中最大极化值(P_max)、剩余极化值(P_r)和矫顽力场强(E_c)逐渐减小;0-3复合和2-2复合PLZT(10/65/35)陶瓷的铁电极化值P_max比均匀混合PLZT(10/65/35)陶瓷明显提高,且其等效二次电光系数在弥散相变温区显著增加。

关键词: 透明陶瓷, 镧掺杂锆钛酸铅, 梯度设计, 温度稳定性, 电光系数, 铁电性能, 光学透过率

Abstract: Lanthanide-doped lead zirconate titanate (PLZT) transparent ceramics have significant potential for application in modern optical communication and high energy laser technology due to their exceptional optical transparency and electro-optical effects. However, the electro-optical (E-O) properties of PLZT transparent ceramics are highly sensitive to changes of ambient temperature, which presents a significant challenge in their application in E-O modulators across a wide temperature range. The objective of this study was to investigate the effects of temperature on the ferroelectric, dielectric and E-O properties of PLZT (10/65/35) transparent ceramics, and optimize the material E-O properties and their temperature stability by regulating the distribution of the key doping element La³⁺ in micro regions. A series of PLZT ceramic samples with pure perovskite structures were obtained by a conventional hot-press sintering process in oxygen atmosphere. The resulting microstructures are uniform and dense, and the optical transmittances of the samples are 52%~60% at a wavelength of 632.8 nm. The broadened dielectric peaks of PLZT ceramics indicate the relaxation characteristics of the materials, and it is promoted as La³⁺ content increasing, and enhance obviously by the enlarged La³⁺ fluctuation in micro-regions in the 0-3 and 2-2 composite PLZT ceramics with a more broadened dielectric peak and higher dielectric constant. The ferroelectric hysteresis loops (P-E) of the PLZT ceramics all exhibit a gradual decrease in maximum polarization value (P_max), residual polarization value (P_r), and coercivity field strength (E_c) with the temperature increasing. P_max values of 0-3 and 2-2 composite PLZT (10/65/35) ceramics are obviously higher than that of the well-distributed PLZT (10/65/35) ceramics, and their equivalent secondary E-O coefficients are significantly increased near the temperature of diffuse phase transition.

Key words: transparent ceramics, lanthanide-doped lead zirconate titanate (PLZT), gradient design, temperature stability, electro-optical coefficient, ferroelectric property, transmittance

中图分类号:

吴文杰, 何代华, 程思远, 何夕云. PLZT透明陶瓷的微区组分调控及梯度设计与电光性能研究[J]. 人工晶体学报, 2024, 53(11): 1956-1963.

WU Wenjie, HE Daihua, CHENG Siyuan, HE Xiyun. Electro-Optical Properties of PLZT Transparent Ceramics with Composition Regulating in Micro-Regions and Gradient Designing[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2024, 53(11): 1956-1963.

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