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A. ABOU SHAMA1,* , M. BAHAA EL-DEN1, YASSER A. EL-GAMMAM1
The local order structure was studied for the amorphous 0.7PbO-0.25B2O3-0.05Al2O3 glasses doped with 0.5, 2.0 and 5.0 gm of Sm2O3. The radial distribution analysis for both short range order (SRO) and medium range order structure (MRO) was applied for the collected XRD data. The sine Fourier transform was performed on the extracted interference function in the inverted space to get on the inter-atomic pair distribution function in the real space. The role of Sm2O3 introduced in the matrix was found to modify the atomic correlated distances of the detected atomic pairs and also their coordination numbers. This role of Sm2O3 was highly observed in the samples 3 and 4 containing 2.0 and 5.0 gm of Sm2O3 to change AlO4 and BO3 to AlO6 and BO4 forms. Three evidenced main peaks were observed at the ranges (2.33-2.54)Å, (4-4.16)Å and (6.65-6.74)Å respectively with the un-doped and doped samples with Sm2O3. These observed peaks were belonging to Pb-O, Pb-Pb in the SRO and Pb-O of the second order in the MRO. The assigned pairs were arranged in the form PbO3 units while the metallic Pb-Pb pairs were of tetrahedral units. The second and successive RDF peaks are of composite structure (can be resolved into more than one atomic pair); accordingly, a small unresolved pre and post shoulders may be predicted in SRO and MRO regions which belonging to B-O and Sm-O correlated pairs. The other correlated pairs such as, Al-Al and Sm-Sm were not evidenced due to their small introduced weights in the given amorphous matrix. The extracted structural information's were correlated with the measured IR for these studied samples and the IR studies gave a good consistency with the RDF analysis for the detected atomic pairs..
SRO, MRO, Tetrahedral units, Inter-atomic correlations, Network units and IR correlation.
A. ABOU SHAMA, M. BAHAA EL-DEN, YASSER A. EL-GAMMAM, Local order structure of lead borate glasses doped with Sm2O3 correlated with IR study, Optoelectronics and Advanced Materials - Rapid Communications, 6, 1-2, January-February 2012, pp.126-131 (2012).
Submitted at: Dec. 19, 2011
Accepted at: Feb. 20, 2012
Optoelectronics and Advanced Materials - Rapid Communications
(2022): 0.5 - 2022 Journal Citation Reports (Clarivate Analytics, 2023)
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