大尺寸Cs2LiYCl6：Ce晶体的制备与性能研究

doi:10.16553/j.cnki.issn1000-985x.2024.0210

摘要/Abstract

摘要： 本文采用垂直坩埚下降法,生长出一系列直径3英寸(1英寸=2.54 cm)的掺铈氯铯锂钇(Cs₂LiYCl₆：Ce,简称CLYC：Ce)晶体,LiCl摩尔配比为55%~60%。对晶体毛坯的顶端不透明部分进行X射线衍射测试,结果表明,富Li的组分配比能有效抑制Cs₃YCl₆相生成。LiCl摩尔配比为57%时得到的晶体中CLYC相的体占比最大,等径完整长度达80 mm。测试了该组分下获得的76 mm×76 mm CLYC：Ce封装晶体的闪烁性能,其对¹³⁷Cs 662 keV γ射线的能量分辨率达到4.88%,²⁴¹Am-Be中子源的脉冲波形甄别(PSD)品质因子(FOM)值为4.18,表现出优异的中子-伽马甄别性能。

关键词: Cs₂LiYCl₆：Ce晶体, 坩埚下降法, 能量分辨率, 脉冲波形甄别, 品质因子

Abstract: In this paper, a series of 3-inch (1 inch=2.54 cm) diameter Cs₂LiYCl₆：Ce (CLYC：Ce) crystals with LiCl molar ratios of 55%~60% were grown by vertical Bridgman method. XRD patterns of opaque initial end of the crystals show that the Li-rich group distribution ratio can effectively inhibit the generation of the Cs₃YCl₆ phase. The optimal molar ratio of LiCl for high quality CLYC is 57%, where the volume ratio of CLYC phase to the total ingot is the largest, and isometric complete length up to 80 mm. Scintillation properties such as relative light output, energy resolution and figure of merit (FOM) of 76 mm×76 mm CLYC：Ce crystal obtained under the optimal proportioning condition were tested. The results show that 4.88% energy resolution is measured at 662 keV of ¹³⁷Cs γ rays. The figure of merit (FOM) of pulse shape discrimination (PSD) measured with a ²⁴¹Am-Be neutron source is 4.18. The study indicates that CLYC：Ce crystal has excellent neutron-gamma discrimination performance.

Key words: Cs₂LiYCl₆：Ce crystal, Bridgman technique, energy resolution, pulse shape discrimination, figure of merit

中图分类号:

O782

赵美丽, 孙涛峰, 高璠, 宫红影, 臧晓微, 桂强, 张春生. 大尺寸Cs₂LiYCl₆：Ce晶体的制备与性能研究[J]. 人工晶体学报, 2025, 54(4): 553-559.

ZHAO Meili, SUN Taofeng, GAO Fan, GONG Hongying, ZANG Xiaowei, GUI Qiang, ZHANG Chunsheng. Preparation and Properties of Large Size Cs₂LiYCl₆：Ce Crystal[J]. Journal of Synthetic Crystals, 2025, 54(4): 553-559.

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大尺寸Cs₂LiYCl₆：Ce晶体的制备与性能研究

Preparation and Properties of Large Size Cs₂LiYCl₆：Ce Crystal

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