ZnGeP_2多晶料合成与晶体生长

Raw material synthesis and growth of ZnGeP_2 crystal

以99．999％的锌、锗和红磷为原料通过直接化合的方法合成ZnGeP2多晶料，采用布里奇曼法通过自发成核方式生长出尺寸为Φ7mm×25mm的ZnGeP2晶体。X射线粉末衍射实验表明合成的多晶料的成分是ZnGeP2，所获ZnCeP2晶体的结构属于四方晶系，空间群142d。X射线摇摆曲线表明所得晶体完整性较好。用莫氏硬度计测得ZnGeP2晶体的莫氏硬度为6．5。测量了晶体的热重和差热曲线，证明在室温～800℃的范围内晶体热学性质稳定。

The polycrystalline material of ZnGeP2 was synthesized by means of a direct reaction with 5N pure zinc, germanium and red phosphor. The ZnGeP2 crystal with dimension of Φ7mm×25mm can be obtained by Bridgman method with the synthesized polycrystalline material. The cell parameters of the as-grown ZnGeP2 crystal were measured by X-ray powder diffraction. The full-width half-maximum （FWHM） of the X-ray rock- ing curve of the as-grown ZnGeP2 crystal was measured to be 245.55＂. The Mohs hardness was determined to be 6.5. The DSC curve indicated that the as-grown ZnGeP2 crystal has good thermal stability in the temperature range from room temperature to 700℃. Thermal gravity analysis shows that the as-grown ZnGeP2 crystal mass changes very little and no more than 0.5% from room temperature to 800℃.