摘要
采用垂直布里奇曼法生长了尺寸为＋30mm×120mm的Cd0.8Mn0.2Te晶锭。采用X射线粉末衍射及X射线双晶摇摆曲线分析了晶体的结构与结晶质量，结果显示所生长的晶体为单一立方闪锌矿结构，半峰宽为47．2arcsec，结晶质量良好。采用化学腐蚀方法显示了晶体中的多种缺陷，包括位错，Te夹杂和孪晶。采用光学显微镜，扫描电镜和X射线能谱仪对缺陷形态和分布进行了研究。结果表明，晶体中位错密度在10^5～10^6cm^-2之间。晶体局部存在％夹杂相，尺寸为1-5μm。晶体中孪晶主要以共格孪晶存在。并提出了缺陷形成的原因和减少缺陷的方法。
Cd0.8Mn0.2 Te crystal ingot with size of φ30 mm×120 mm was successfully produced with vertical Bridgman method. The crystalline structure was verified by X-ray diffraction to be a pure cubic zinc blende structure. Double-crystal rocking curve measurement showed the FWHM to be 47.2arcsec, indicating a high crystalline perfection. Chemical etching was applied to reveal the crystal defects, such dislocations, Te inclusions and twins. Adopting an optical microscope, scanning electron microscopy with energy dispersive spectroscopy （SEM/EDS）, the morphology and distribution of these defects were analyzed. The results showed that the dislocation density was between 10^5-10^6cm^-2. Twins was observed in the crystal with mainly the coherent twin. Te inclusions with the size of 1-5μm distributed inhomogeneously in the crystal, and was more often observed at twin boundaries. The formation principles of these defects and methods to decrease them were further discussed.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2007年第6期1220-1224,共5页
Journal of Synthetic Crystals
基金
国家自然科学基金重点项目(No.50336040)
