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Title: Infrared study of the effect of P<sub>2</sub>O<sub>5</sub> in the structure of lead silicate glasses
Authors: Ahsan, M Rafiqul
Uddin, M Alfaz
Mortuza, M Golam
Keywords: Infrared spectra
Lead silicate glasses
Binary glass
Issue Date: Feb-2005
Publisher: CSIR
Series/Report no.: G01J 3/00
Abstract: The infrared spectra of <i style="">x</i>PbO (1-<i style="">x</i>-<i style="">z</i>)SiO<sub>2</sub>zP<sub>2</sub>O<sub>5</sub> glasses with a PbO:SiO<sub>2</sub> molar ratio of 3:2 and <i style="">z</i>=0,1,2,5,30,40 and 50 mol% have been examined in the region 4000-400 cm<sup>-1</sup>, together with XRD. The structure of PbO-SiO<sub>2</sub> binary glass is significantly different from that of P<sub>2</sub>O<sub>5</sub> substituted glasses. The low amount of P<sub>2</sub>O<sub>5 </sub>containing PbO-SiO<sub>2 </sub>glasses results in infrared spectra of the same pattern as 3:2 binary lead silica glass but the maximum peak intensities and positions are different. The spectra of high P<sub>2</sub>O<sub>5</sub> (30-50 mol%) containing glasses show an increased number of distinct peaks in the low frequency region with a convolution of several broad Gaussians in the high frequency region. All the spectra are base line corrected and deconvoluted to appropriate number of Gaussians. The peaks and peak positions of the Gaussians are assigned to Si-O-Si, Si-O-Pb, Si-O-P, P-O-P, O-P-O, P=O, P-O<sup>-</sup> etc. bonds. A variation in the band positions and the relative amounts of bonds with P<sub>2</sub>O<sub>5</sub> is also shown. The result indicates that <i style="">ortho-</i> and <i style="">pyro-</i>phosphate are formed around 1-5 mol% P<sub>2</sub>O<sub>5</sub> containing glasses and <i style="">meta-</i>phosphate species from the high P<sub>2</sub>O<sub>5</sub> containing glasses. The ionic character of the phosphate groups P-O<sup>-</sup>, PO<sub>4</sub><sup>3</sup><sup>- </sup>is well revealed by the formation of new band within 1250-900 cm<sup>-1</sup>. The incorporation of high contents of P<sub>2</sub>O<sub>5</sub> in the materials suggests that P<sup>5+ </sup>occupies the network position and forms the linkage Si-O-P in the glasses. This Si-O-P bond may lead to the formation of five and six coordinated silicon in the glass matrix. X-ray diffraction pattern of the base samples, within the detection limit, shows that all are homogeneous glasses and these have not shown any evidence of phase separation on optical inspection.
Description: 89-99
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.43(02) [February 2005]

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