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中子探测用LiInSe2晶体生长及表征
Growth and Characterization of LiInSe2 Crystal for Neutron Detection
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- DOI:
- 作者:
- 张哲人，朱孟花，徐亚东
ZHANG Zheren1 , ZHU Menghua1,2, XU Yadong1,2
- 作者单位:
- 1. 西北工业大学 凝固技术国家重点实验室，陕西 西安 710072；2. 西北工业大学 材料学院，陕西 西安 710072
1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China; 2. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
- 关键词:
- 热中子探测；LiInSe2；晶体生长；α 粒子响应
thermal neutron detector; LiInSe2; crystal growth; α response
- 摘要:
- LiInSe2 晶体是一种可在室温下探测热中子的新型半导体中子探测材料。本文采用低温合成法，获得大量高
纯多晶 LiInSe2 原料，通过改进生长工艺得到了高质量的红色 LiInSe2 晶体。 通过研究晶体的透过率、夹杂相等，表征了
晶体的生长质量，测试晶体对 α 粒子的响应来研究晶体进行中子探测的可能性。 结果表明，晶体的红外透过率为 75%，
禁带宽度为 2.3 eV，夹杂相密度达到 2 900 个/cm2
，夹杂相的尺寸在 1～10 μm 左右。 测得电阻率在 5×1011 Á·cm 左右，
对 α 粒子的能量分辨率为 55%。
LiInSe2 crystals are a new type of semiconductor neutron detection material that can detect thermal neutrons at room temperature. In this paper, we synthesized a large number of high purity LiInSe2 polycrystals by a low temperature synthesis method, and obtained high quality red LiInSe2 crystals by improving the growth process. The growth quality of the crystal was characterized by studying the transmittance and inclusion equality of the crystal, and the possibility of neutron detection was also studied by testing the response of the crystal to α particles. The results show that the infrared transmittance of the crystal is 75%, the width of the band gap is 2.3 eV, the density of the inclusion phase is 2 900/cm2 , and the size of the inclusion phase is approximately 1~10 μm. The measured resistivity is approximately 5×1011 Á cm, and the energy resolution for α particles is 55%.