Karmakar, Basudeb and Kundu, Paritosh and Dwivedi, Ravindra Nath (2001) IR spectra and their application for evaluating physical properties of fluorophosphate glasses. Journal of Non-Crystalline Solids, 289 (1-3 ). pp. 155-162. ISSN 0022-3093

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Infrared (IR) absorbance spectra in the range 500-4000 cm(-1) of the glasses in the system Ba(PO3)(2)-MgF2-CaF2-AlF3 have been studied with increasing fluoride content. Quantitative justification for assignment of some bands has been attempted. The spectra reveal that the glass structure changes with fluoride addition from metaphosphate, (PO3-)(n) to P-2 (O, F)(7) and P(O, F)(4) along with the formation of Al(O, F)(6), [AlF6](3-) and [AlF4](-). As a result of these structural changes density (a), refractive index n,) and IR band absorption coefficient at similar to 2170 cm(-1)(alpha (IR)) of the glasses vary exhibiting maxima at similar to 36 mol% fluoride. Statistical analyses show that d and n, are correlated with alpha (IR) by linear equations. Each of these equations gives a high correlation coefficient (r) and low residual standard deviation (RSD), and may, thus, be employed for the evaluation of physical properties of fluorophosphate glasses. Physical properties of some fluorophosphate glasses of this work and the published literature have been calculated by using these equations to test their validity. The experimental properties of the glasses present a very good fit of data within 95% confidence interval of the calculated mean values. These facts indicate the suitability of this IR spectroscopic method for the determination of physical properties of fluorophosphate glasses

Item Type: Article
Subjects: Glass
Depositing User: Mrs Chandana Patra
Date Deposited: 13 Feb 2012 07:43
Last Modified: 13 Feb 2012 07:43
URI: http://cgcri.csircentral.net/id/eprint/791

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