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X-ray radial distribution analysis of amorphous Bi2O3-B2O3-TeO2 (BBT)

A. ABOU SHAMA1,* , A. ABD-ALLAH1, G. MA. YOUSSEF1

Affiliation

  1. Physics Department, Faculty of Science, Ain Shams University, 11566 Abbassia, Cairo, Egypt

Abstract

Short range order (SRO) and Medium range order (MRO) of the amorphous [xBi2O3-(0.5-x)B2O3](0.5TeO2) with x=0.05, 0.1, 0.2, and 0.3 respectively were studied with the application of X-ray radial distribution analysis. This set of samples was prepared by the melt rapid quenching technique of its initial reagents. The extracted information for the first ordered shells in the real space clearly showed the role of incresed percents of Bi2O3. The role of Bi2O3 introduced in the matrix was found to increase the amorphous network order besides its ability to modify the atomic correlated distances of the detected atomic pairs and also their coordination numbers. The first ordered shell in SRO was belonging to Te-O pairs arranged in the form TeO4 at nearly 1.96Å with an evolution of Te-O pairs with Non-Bridging Oxygen (NBO) at nearly 1.83Å. The correlated Bi pairs of oxygen environment were revealed at 2.57Å for x=0.05, 0.1, 0.2 and this distance was highly stretched at x=0.3 to be 2.75Å with a distorted pyramidal form. The Te-Te and Bi-Bi atomic pairs were observed at 3.85Å, 4.35Å for x=0.05 and 0.2. The previous pairs had contracted distances, 3.75Å, 4.20Å for x=0.1 and 0.2 respectively. The B-O and/or B-B correlations were not evidenced due to the weak scattering strength of B2O3 to X-ray compared to other heavier components. The previous atomic pairs of Te-Te and Bi-Bi had a layered structure in the MRO region. The bond angle distributions of different atomic pairs were also reported as a funtion of x and throwed an increased structural information on the studied amorphous system..

Keywords

Non-Bridging Oxygen (NBO), Bridging oxygen (BO), Distorted octahedral glasses and pyramidal units.

Submitted at: Jan. 25, 2013
Accepted at: May 15, 2014

Citation

A. ABOU SHAMA, A. ABD-ALLAH, G. MA. YOUSSEF, X-ray radial distribution analysis of amorphous Bi2O3-B2O3-TeO2 (BBT), Journal of Optoelectronics and Advanced Materials Vol. 16, Iss. 5-6, pp. 677-681 (2014)