【摘要】 在物理气相法的基础上,通过无约束二次气相输运法生长出具有自然显露面的尺寸约为6 mm×7 mm×2 mm CdSe晶体。对生长晶体的结构、成分和形貌进行表征,测试发现:XRD粉末衍射图谱强度高无杂峰,CdSe晶体的3个自然显露面分别是(100)、(002)和(110)面,回摆曲线半峰宽度较小;ICP-MS结果显示样品中杂质含量有效降低;红外透过率测试结果显示无约束二次气相法生长的CdSe晶体红外透过率高;SEM观测发现其解理面呈阶梯状且台阶方向一致。结果表明,采用无约束二次气相法生长的CdSe晶体结晶质量较好,纯度高,红外透过率高,并根据BFDH模型分析CdSe晶体自然显露面出现的原因。更多还原

【Abstract】 On the basis of the physics gas phase method,the CdSe crystal with natural appearances was grown by the unconstrained quadratic phase vapor transport method,the size of which is about 6 mm × 7mm × 2 mm. The microstructure,composition and morphology of the crystal were characterized by XRD,ICP-MS and SEM. The peak intensity of XRD diffraction is high without impurity peaks. The three natural appearances of CdSe crystal are( 100),( 002) and( 110) planes,respectively,and the full width at half maximum( FWHM) of the rocking curves are small. The CdSe crystal grown by the unconstrained quadratic phase vapor transport method has less impurity content and higher infrared transmission. SEM observation demonstrates that the cleavage planes is stair-stepping and the stretching direction of the steps are uniform. All the results show that the CdSe crystal grown by the unconstrained quadratic phase vapor transport method has high purity,crystalline quality and infrared transmission,and the reason of natural appearances of CdSe crystal was analyzed by BFDH model.更多还原