Growth of 2 Inch Eu-doped SrI2 single crystals for scintillator applications

被引:13
|
作者
Yoshikawa, Akira [1 ,2 ,3 ]
Shoji, Yasuhiro [1 ,3 ]
Yokota, Yuui [2 ]
Kurosawa, Shunsuke [1 ,2 ]
Hayasaka, Shoki [3 ]
Chani, Valery I. [1 ]
Ito, Tomoki [1 ]
Kamada, Kei [1 ,3 ]
Ohashi, Yuji [1 ,3 ]
Kochurikhin, Vladimir [3 ,4 ]
机构
[1] Tohoku Univ, IMR, Sendai, Miyagi 9808577, Japan
[2] Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Sendai, Miyagi, Japan
[3] C&A Corp, Aoba Ku, 6-6-40 Aramaki Aza Aoba, Sendai, Miyagi 9808577, Japan
[4] Inst Gen Phys, Vavilov St 38, Moscow 119991, Russia
基金
日本学术振兴会; 日本科学技术振兴机构;
关键词
Bridgman technique; Growth from melt; Halides; Scintillator materials; PULLING-DOWN METHOD; MELT;
D O I
10.1016/j.jcrysgro.2016.04.040
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
A vertical Bridgman (VB) crystal growth process was established using modified micro-pulling-down (mu-PD) crystal growth system with a removable chamber that was developed for the growth of deliquescent halide single crystals because conventional mu-PD method does not allow growth of large bulk single crystals. Eu:SrI2 crystals were grown from the melt of (Sr0.98Eu0.02)I-2 composition using carbon crucibles. Undoped mu-PD SrI2 crystals were used as seeds that were affixed to the bottom of the crucible. All the preparations preceding the growths and the hot zone assembling were performed in a glove box with Ar gas. Then the removable chamber was taken out of the glove box, attached to the mu-PD system, connected with a Turbo Molecular pump, and evacuated down to 10(-4) Pa at similar to 300 degrees C. After the baking procedure, high purity Ar gas (6N) was injected into the chamber. The crucible was heated by a high frequency induction coil up to the melting point of Eu:SrI2. After melting the starting materials, the crucible was displaced in downward direction for the crystal growth and then cooled down to room temperature. Thus, 2 in. and crack-free Eu:SrI2 bulk crystals were produced. The crystals had high transparency and did not contain any visible inclusions. The crystals were cut and polished in the glove box and then sealed in an aluminum container with an optical window for characterization. The details of the crystal growth are discussed. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:73 / 80
页数:8
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