Understanding phase equilibria and segregation in Bridgman growth of Cs_2LiYCl_6 scintillator
Understanding phase equilibria and segregation in Bridgman growth of Cs_2LiYCl_6 scintillator
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DOI：
10.1557/jmr.2017.168
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发表时间：
2017-06
影响因子：
2.7
通讯作者：
Francesco L. Ruta;S. Swider;S. Lam;R. Feigelson
中科院分区：
文献类型：
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作者：
Francesco L. Ruta;S. Swider;S. Lam;R. Feigelson
Cs_2LiYCl_6 （CLYC）是一种具有良好能量分辨率和双伽马/中子探测能力的商用闪烁体材料。目前用于探测器的CLYC晶体是用垂直布里奇曼法生长的。然而，从化学计量熔体中生长出来的气泡通常在晶体的开始和结束处分别含有二次相Cs_3YCl_6和LiCl，这表明这种成分是不一致熔化的。由于在此之前的文献中没有包含CLYC的相图，所以我们对Cs_2YCl_5-LiCl相图进行了探索。然后从不同的熔体成分中生长出几种晶体。根据相图预测，当初始组成为60 mol%左右的LiCl时，不会生成Cs_3YCl_6， LiCl的浓度保持在较低水平。
Cs_2LiYCl_6 (CLYC) is a commercial scintillator material having good energy resolution and dual gamma/neutron detection capabilities. CLYC crystals currently used in detectors are grown by the vertical Bridgman method. Boules grown from stoichiometric melts, however, often contain secondary phases, Cs_3YCl_6 and LiCl, at the beginning and end of the crystal, respectively, suggesting that this composition is incongruently melting. Since no phase diagram containing CLYC existed in the literature prior to this study, the Cs_2YCl_5–LiCl phase diagram was explored. Several crystals were then grown from various melt compositions. As predicted from the phase diagram, a starting composition of around 60 mol% LiCl did not produce Cs_3YCl_6 and maintained a low concentration of LiCl.