Preparation of Near Stoichiometric Lithium Tantalate Crystal by Asymmetric Diffusion Technique

Abstract

Abstract: Vapor equilibrium transport method is used to prepare near stoichiometric lithium tantalate crystals with high quality. However, it is difficult to prepare large-thickness crystals by this method due to its low solid diffusion rate. In this paper, based on the diffusion mechanism of lithium tantalate crystal, the diffusion of lithium tantalate crystal was carried out by asymmetric diffusion process with lithium rich atmosphere on one side of the wafer and congruent composition atmosphere on the other side. The composition and domain inversion field were characterized. The results show that the asymmetric diffusion technique provides a channel for the diffusion of anti-tantalum ion and increases the diffusion rate of anti-tantalum ion and lithium ion in the crystal, which is beneficial to the preparation of large-thickness near stoichiometric lithium tantalate crystal.

Key words: near stoichiometric, lithium tantalate crystal, vapor equilibrium transport method, asymmetric diffusion technique, lithium rich atmosphere, diffusion rate, congruent composition

CLC Number:

O791

YANG Jinfeng, SHANG Jifang, LI Qinglian, YANG Yalin, XU Jun, FU Zhumu, SUN Jun. Preparation of Near Stoichiometric Lithium Tantalate Crystal by Asymmetric Diffusion Technique[J]. Journal of Synthetic Crystals, 2022, 51(7): 1141-1146.

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