Structural Investigation of Amorphous xLi2O. xWO3. (1-2x)B2O3 Correlated with its Physical Properties

The system Li2O-WO3-B2O3 were prepared with equal molar ratios of both Li2O and WO3 by the usual rapid quenching technique. From the analysis of X-ray diffraction data (using a Mo-source of wavelength λ = 0.709 Å), it was found that for 0.0 ≤ x ≤ 0.25 the systems formed are crystalline, while for x ≥ 0.30, glassy formed systems are obtained. The glassy phases are investigated by analyzing the experimental radial distribution function RDF in both short range order (SRO) and medium range order (MRO) regions. The structural derived information's from RDF analysis in the two regions are significant and promising. The first nearest neighbor distance which is due to B-O correlations had an extended distance (1.30-1.499) Å. The presence of Li2O in that amorphous matrix in the present ratio can modify the BO3 units to BO4 ones. The second nearest neighbor of W-O bonds were arranged in form of distorted WO6 of a dispersed bond length (1.712-2.149) Å. Both of B-B and O-O correlations are of smaller scattering weights and are observed as included shoulders within a main representative peak. The presence of bridging and nonbridging oxygen's was detected inside MRO range. The building units of B-O containing non-bridging oxygen's (NBO) was detected in the range (~3.099- 3.25) Å, while those including bridging oxygen (BO) was observed in the range (3.489-3.788) Å. The activation energy and electrical conductivity for the studied samples are measured and supplied for these structural collected data [12] to give a good correlation in between.