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Submitted on: 31 August 2001.
Revised on: 20 October 2001.
Accepted on: 13 November 2001.
___________________Journal of Non-Crystalline Solids
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Submitted on: 25 June 2015.
Revised on: 04 October 2015.
Accepted on: 24 November 2015.
___________________Journal of Non-Crystalline Solids
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Submitted on: 09 December 2021.
Revised on: 22 February 2022.
Accepted on: 18 April 2022.
___________________Journal of Non-Crystalline Solids
Submitted on: 29 March 2011.
Revised on: 14 June 2011.
Accepted on: 17 July 2011.
___________________Journal of Non-Crystalline Solids