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人工晶体学报 ›› 2025, Vol. 54 ›› Issue (5): 793-800.DOI: 10.16553/j.cnki.issn1000-985x.2024.0270

• 研究论文 • 上一篇    下一篇

Li2MoO4晶体的坩埚下降法生长及其发光性能

刘文宇(), 钱露, 李芳建, 潘尚可(), 孙志刚, 陈红兵, 潘建国   

  1. 宁波大学材料科学与化学工程学院,宁波 315211
  • 收稿日期:2024-11-01 出版日期:2025-05-15 发布日期:2025-05-28
  • 通信作者: 潘尚可,博士,教授。E-mail:panshangke@nbu.edu.cn
  • 作者简介:刘文宇(2000—),男,安徽省人,硕士研究生。E-mail:lwy19956891838@163.com
  • 基金资助:
    国家自然科学基金(12141505);国家自然科学基金(61875096)

Growth and Luminescence Properties of Li2MoO4 Crystal by Bridgman Method

LIU Wenyu(), QIAN Lu, LI Fangjian, PAN Shangke(), SUN Zhigang, CHEN Hongbing, PAN Jianguo   

  1. School of Materials Science and Chemical Engineering,Ningbo University,Ningbo 315211,China
  • Received:2024-11-01 Online:2025-05-15 Published:2025-05-28

摘要: 基于无中微子双β衰变低温辐射探测器的研究,本文研究了Li2MoO4晶体生长及发光性能。以市售Li2MoO4粉末为初始原料,采用水平区熔法提纯,随后通过坩埚下降法生长得到1英寸(1英寸=2.54 cm)Li2MoO4透明晶体。对晶体进行了物相分析与发光性能表征。X射线粉末衍射结果显示,晶体属于六方晶系,空间群为R3,晶胞参数为a=14.337 Å,b=14.337 Å,c=9.589 Å。电感耦合等离子体质谱表明提纯后生长的晶体Rb、Cs、Cu、Cr、Mn、Ni、Th和U杂质元素含量明显降低。差热分析表明Li2MoO4熔点为696 ℃。紫外-可见分光光度计显示,晶体透过率较高,最高可达86%,表明晶体光学质量高,杂质含量少。稳态与瞬态荧光光谱表明,在10~300 K,Li2MoO4晶体的变温荧光光谱与光致衰减时间随温度变化,荧光强度在10 K时达到最大,光致衰减时间则随温度降低而延长,10 K下的衰减时间为1 222.6 μs。晶体的活化能Ea为6.15 meV。研究表明Li2MoO4晶体在低温下具有良好的发光性能,在无中微子双β衰变研究中,特别是低温辐射探测器方面,具有重要应用价值。

关键词: 无中微子双β衰变; Li2MoO4晶体; 提纯; 坩埚下降法; 荧光光谱; 衰减时间

Abstract: In the research on cryogenic radiation detectors for neutrinoless double β decay, the growth and luminescence properties of Li2MoO4 crystals were studied. Commercially sourced Li2MoO4 powder was used as the starting material and was purified through the horizontal zone melting method. A 1 inch (1 inch=2.54 cm) transparent Li2MoO4 crystal was grown by Bridgman method. Phase analysis and luminescence property characterization were conducted on the crystal. X-ray powder diffraction reveals that the crystal belongs to the hexagonal system, with a space group of R3 and unit cell parameters a = 14.337 Å, b = 14.337 Å, and c = 9.589 Å. Inductively coupled plasma mass spectrometry shows that the contents of impurity elements Rb, Cs, Cu, Cr, Mn, Ni, Th and U in the crystals grown after purification were significantly reduced. Differential thermal analysis shows that its melting point is 696 ℃. The maximum optical transmittance, measured by ultraviolet-visible spectrophotometry, was found to reach 86%, indicating that the crystal has high optical quality and low impurity content. Steady-state and transient fluorescence spectra were measured, showing that the temperature-dependent fluorescence spectra and photoluminescence decay time of the Li2MoO4 crystal varied within the temperature range from 10 K to 300 K. It was observed that fluorescence intensity peaked at 10 K, while the photoluminescence decay time reduces with rising temperature, reaching 1 222.6 μs at 10 K. The activation energy Ea of the crystal is 6.15 meV. These findings suggest that the Li2MoO4 crystals grown by this method exhibit excellent luminescence properties at low temperatures, making them highly suitable for application in neutrinoless double β decay research, particularly in cryogenic radiation detectors.

Key words: neutrinoless double β decay; Li2MoO4 crystal; purification; Bridgman method; fluorescence spectrum; decay time

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