Mosaic and gradient SiGe single crystals for gamma ray Laue lenses

被引：26
作者：
Abrosimov, N. V.
机构：
[1] Inst Crystal Growth, D-12489 Berlin, Germany
[2] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Russia
来源：
EXPERIMENTAL ASTRONOMY | 2005年 / 20卷 / 1-3期
关键词：
X-ray diffraction; mosaic crystal; gradient crystal; crystal growth; Czochralski method; germanium silicon alloys;
D O I：
10.1007/s10686-006-9025-6
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Both Ge(1-x)Si(x) mosaic crystals and Si(1-x)Ge(x) crystals with gradient of composition could be grown using the modified Czochralski technique to produce the diffracting elements for the MAX gamma ray telescope. Although many elements cut from the mosaic crystal and used before for CLAIRE gamma ray telescope had an efficiency up to 20%, the overall efficiency of the lens was about 8.1 +/- 0.7%, which is more than twice lower than the theoretically predicted efficiency. Some causes of this behaviour are discussed. In addition to mosaic crystals, the growth of S(1-x)Ge(x) crystals with a gradient of composition and their properties are analysed. Such composition-gradient crystals could be a promising way to improve the diffraction efficiency of Lane lens for MAX.
引用
收藏
页码：185 / 194
页数：10
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