Figure ( 1 ) shows the XRD for bismuth borate glass samples containing molybdenium oxide from 0 to 20 mol %. From figure (1) can observe that the samples containing molybdenium oxide up to 15mol%MoO3 are in the amorphous state. Then the sample containing 20mol% MoO3 are I the amorphous and crystalline state. The analysis of the sample containing 20mol% MoO3 poured between two copper plates or poured at air, the x-ray diffraction patterns indicate the formation of Bi2MoO6 crystalline phase formed in the sample at air more intensity than the sample between two copper plates. This phase is one of the important Aurivillius oxides [15] possessing special perovskite-like layer structures, photocatalytic activity under visible light irradiation, the increased optical absorption efficiency and the decreased photo-generated carriers recombination efficiency. The FTIR spectra provided structural information as the arrangement of the structural units present in the glass samples with …show more content…
The values of the experimental and the theoretical density determined and tabulated in table 1. From table 1, it can show a little difference between the calculated and the experimental values that represent the accurate measurements. The density behavior can be explained according to the molecular weight and the structural volume. From fig 3 it can be observed that density increase as the increase of MoO3 that have larger molecular weight than the B2O3. From the structural units view the introduction of MoO3 into composition converts symmetric BO3 triangles into BO4 tetrahedral or converts the latter into asymmetric BO3 triangles. Both the BO4 tetrahedral and asymmetric BO3 triangles are considerably denser than the symmetric BO3 triangles. [9] The average boron-boron separation (-- removed HTML --) calculated according the relation [19,