退火热处理对ZnGeP_2晶体光学性能的影响  

Influence of annealing on optical property of ZnGeP_2 single crystal

作　　者：赵欣[1] 吴小娟[1] 

机构地区：[1]中国民用航空飞行学院,四川广汉618307

出　　处：《功能材料》2015年第23期23096-23100,23103,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50732005);四川省科技厅基金资助项目(2015ZR0034);中国民用航空飞行学院科研基金资助项目(J2014-92;Q2012-126)

摘　　要：采用坩埚下降法生长出尺寸为Ф22mm×30mm 的磷锗锌（ZnGeP2）单晶体.分别采用真空P氛围和真空ZnGeP2多晶粉末包裹对生长的ZnGeP2晶体进行退火处理.利用X射线衍射仪、能量分散光谱仪、红外分光光度计,测试了不同退火条件下ZnGeP2晶体中的元素组成和红外透光谱.结果表明,采用真空ZnGeP2多晶粉末包裹,580-600℃保温300h的退火工艺,能够较好地弥补晶片中Zn、P原子缺失,成分更接近ZnGeP2理想化学计量比.退火后的晶体在近红外波段范围内（0.7-2μm）的透过率有约30%的提高,在2-10μm 范围内的平均透过率接近60%.晶体光学质量显著提高,满足光学器件的制作要求.An integral ZnGeP_2( ZGP) single crystal with size of φ22 mm × 30 mm was obtained by vertical Bridgman method( VBM). The as-grown crystals were annealed in vacuum-P vapor and vacuum-ZGP powder,respectively. The elemental content and infrared transmission spectrum of ZGP crystals annealed in different environments were characterized by X-Ray diffraction( XRD),Energy dispersive spectroscopy( EDS),Ultraviolet( UV) and Infrared( IR) spectrophotometers. XRD and EDS analysis indicated the relative concentration of Zn and P in the as-grown crystal could be complemented and the composition of crystal was closed to theoretical stoichiometry after annealed in vacuum-ZGP powder at 580-600 ℃ for 300 h. Simultaneously,the near-infrared transmittance of crystal was enhanced about 30% in the spectral region of 0. 7-2 μm,the infrared transmittance was close to 60% in the spectral region of 2-10 μm. These results demonstrate that the optical quality of the as-grown crystal annealed in vacuum-ZGP powder was improved significantly enough for fabrication of infrared nonlinear devices.

关 键 词：磷锗锌 坩埚下降法 晶体生长 退火 红外光谱 

分 类 号：O77[理学—晶体学] O782