Crystal Growth, Optical Spectra and Thermal Properties of Na2Ni(SO4)2·4H2O Crystal
Na2Ni(SO4)2·4H2O crystal (NNSH) size up to 12mm×10mm×8mm have been grown by heating the solution gradually. The structure of crystal was determined by X-ray diffraction method. The transmission spectra with strong absortpion band at visible and infrared region were measured by using UV-VIS ultraviolet spectrophotometer. Absorption cross-sections of crystal at 344nm and 640nm were evaluated as 4.380×10-18cm2 and 3.63×10-18cm-2,respectively. NNSH was stable at high temperature, for the dehydration temperature of the crystal was determined to be 132.6 °C by thermogravimetric measurement. It was shown that NNSH had strong absorption at visible or infrared region and high thermal stability that may render it to be a filter material as to obtain more pure ultra-violet spectrograph and be accessible in high temperature environment.
Yuhang Yang, Xilong Qu, Yiping Luo and Aimin Yang
R. R. Zhuang et al., "Crystal Growth, Optical Spectra and Thermal Properties of Na2Ni(SO4)2·4H2O Crystal", Advanced Materials Research, Vol. 216, pp. 312-315, 2011