Unique 3D framework formed by adding MIIO4 groups into high Sb/P ratio phosphatoantimonates

Explorations on a mixed metal phosphatoantimonate system led to the discovery of two new anhydrous phosphatoantimonates, namely, Cs4MSb6P4O28 (M=Mg, Zn), which represent the first examples of quinary AI – MII –SbV – PV– O systems. Single-crystal structure analysis reveals that the two title compounds crystallize in the tetragonal space group I41/a (No. 88). Their structures feature complicated 3D frameworks with interesting tunnel structures comprised of corner sharing MO4 tetrahedra, SbO6 octahedra and PO4 tetrahedra, with the Cs+ cations sitting in the tunnels to balance the valence. Optical reflectance spectrum measurements show that these two compounds are insulators with band gaps of about 4.5 eV.

Study on the Low-Emissive Camouflage Pigment

A low-emissive pigment of Al/SiO2/Fe2O3/FeO/Fe4[Fe(CN)6]3/Cr2O3/Cr (MAS) was prepared by chemical deposition method. The camouflage characteristics of the coated fabric with paint mixed with MAS, binder and other auxiliary in the thermal infrared (IR 8~14 um) and the optical (0.38~1.2 um) region, was studied by emissivity tester, visible light camera and thermal infrared imager. The results show that the MAS pigment has low emissivity and optical camouflage effectiveness compared with the Al/SiO2 pigment. Particularly, the MAS pigment is in green by depositing metal oxide, ferrocyanide and pure metal on the surface of Al/SiO2. The optical reflectance spectrum of coated fabric was similar to the natural grass. Furthermore, the surface emissivity of the coated fabric reached 0.51 in the IR region. The thermography of the coated fabric with 4 wt% MAS was similar to the natural grass. It can conclude that the coated fabric can perfectly imitate grass background.

Optical Properties of Random Multilayers of Amorphous A-Si:H/A-Si3N4+x:H and the Classical Localization

ABSTRACTIn the optical reflectance spectrum of the random multilayers of a-Si:H/a-Si3N4+x:H, it is observed an anomalous peak which is explained by the classical localization of light propagation. The following two subjects are discussed in this report; (a). The Kramers-Kronig transformation is done including the anomalous disorder-related reflectance peak. Extra absorption coefficients Δα are obtained by this analysis. Energy dependence of the localization length 1(hv) of light propagation are obtained by 1(hv)=1/Δα(hv). (b). The other is the experiment on scaling where the ratio of the disorder and the average layer thickness is kept constant but the size of each layer is changed in each experiment