IR Li2Ga2GeS6 nonlinear crystals were directly obtained with the composition of 40GeS2- 30Ga2Ss-30LieS, by the conventional melt-quenching method. The high depth digital image indicated that the obtained LizGa2GeS6 crystals showed a big size of 0.3 × 0.25 × 0.3 mm3. It was shown that the compound was very suscepfive to H20 with second harmonic observation. Besides, the glass-forming region of GeS2-Ga2S3- Li2S system was further studied by the conventional melt-quenching method.GeS2-Ga2S3-Li2S glass-ceramics containing IR Li2Ga2GeS6 nonlinear nanocrystals were obtained at a more carefully controlled heating rate.
The mesoporous silica modifed with magnesium ox- ide （MgO） was syntbesized by one step method and impregnating method, respectively. The samples were characterized by small angle X-Ray diffraction （XRD）, N2 adsorption-desorption and transmission electron microscopy （TEM）, and the carbon dioxide adsorption capacity was analyzed by thermal gravimetric analysis （TGA）. Compared with the original mesoporous silica （20.7 mg/g）, the CO2 adsorption capacity of MgO-modified mesoporous silica processed by one step method increases to 32.9 mg/g. Although its surface area greatly decreases compared with that of the original mesoporous silica, the MgO-modified mesoporous silica prepared by impregnating reaches an adsorptive value of 31.1 mg/g because the number of basic sites increases on the surface of the mesoporous silica.
