Single crystals of Ca3NbGa3Si2O14 (CNGS) with ordered Ca3Ga2Ge4O14 (CGG) structure were successfully grown from stoichiometric melts by conventional Czochralski technique along the a-axis and two large (001) facets and two small (100) facets appear in every crystal. An arrangement of parallel steps and a clear height change were observed in (001) facet by atomic force microscopy (AFM). High-resolution X-ray diffraction (HRXRD) results indicate that CNGS crystals have good quality and free low-angle boundaries. The crystals also exhibit good optical quality and high optical transmittance in c-direction.
Shi Xuzhong Yuan Duorong Cheng Xiufeng Guo Shiyi Yu Guangwei Li Zhanfa
Nano-sized Er^(3+)∶Y_(3)Al_(5)O_(12)powders was successfully prepared via a simple sol-gel route at as low a temperature at 800℃whereas a temperature much higher is necessary to obtain this compound by solid state synthesis(about 1500℃).The phase purity,composition and microstructural features of the materials were analyzed by means of X-ray diffraction(XRD),infrared spectroscopy(IR)and transmission electron microscopy(TEM),and no other intermediate phase were observed to form in the range of 700~1000℃.The luminescence spectra of Er^(3+)substituted for Y^(3+)in YAG in 1%content was characterized on samples at different temperature.
Li ZhanfaYuan DuorongDuan XiulanShi XuzhongSong Jian'anWang Lihua
