Fabrication and Microstructure of Y3+∶CaF2 Transparent Ceramics

Abstract

Abstract: Y³⁺∶CaF₂ powders were synthesized by chemical coprecipitation method, and transparent ceramics were fabricated by vacuum hot pressing sintering method. Characteristics of the as-synthesized powders were investigated by XRD, SEM and TEM techniques, the relationship between microstructure and transmittance of transparent ceramics were also analyzed. Crystal structures of as-synthesized Y³⁺∶CaF₂ powders belong to single fluorite phase. With the Y³⁺ doping content increases, the average particles sizes decrease and the lattice constants increase from 5.452 1 Å to 5.465 5 Å. The 5%Y³⁺∶CaF₂ transparent ceramics sintered at 900 ℃ for 3 h exhibits the highest transmittance, and the transmittance at 500 and 1 500 nm are 73.1% and 86.4%, respectively. Microstructure of ceramics are modified by the Y³⁺ doping content and sintering temperatures. For a low growth velocity, it is not easy to eliminate the residual pores, while for a higher growth velocity, residual pores are easily embedded within grains. Both cases will reduce the transmittance of transparent ceramics. This work provides a reference for the preparation of high-quality composite CaF₂ transparent ceramics.

Key words: CaF₂ transparent ceramics, Y³⁺ doping, hot pressing sintering, microstructure, transmittance

CLC Number:

LIU Zuodong, PAN Qiyue, LIU Rui, CAO Yue, LI Siya, WANG Jiashun, YU Yongsheng, LIU Peng, JING Qiangshan. Fabrication and Microstructure of Y³⁺∶CaF₂ Transparent Ceramics[J]. Journal of Synthetic Crystals, 2024, 53(11): 1997-2003.

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Fabrication and Microstructure of Y³⁺∶CaF₂ Transparent Ceramics

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