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The influence of adding Fe2O3 at the expense of Na2O in sodium lead borate glasses on the structural, physical and electrical properties have been investigated. Results obtained from Fourier transform infrared (FTIR) spectra indicated that Fe2O3 plays an important role in converting three coordinated boron atoms [BO3] to four coordinated boron atoms [BO4]. The physical properties such as density and molar volume helped to evaluate the compact structure of the prepared glass samples due to presence of [BO4] groups. The increase of Fe2O3/Na2O replacements led to increasing the microhardness values and decreasing the thermal expansion coefficients of the studied glasses. The increase of Fe2O3/Na2O replacements generally decreased the AC conductivity. That decrease might be due to converting of the three coordinated boron atoms [BO3] to four coordinated boron atoms [BO4]. Dielectric constants of the samples might be an indication of the distortion in the coordinated boron atoms. The obtained experimental data indicated the internal structure of glass network and the change of the structure of the samples from three [BO3] to four coordinated boron atoms [BO4].


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Influence of Fe2O3 on the physical, structural and electrical properties of sodium lead borate glasses

Show Author's information Safeya IBRAHIMaMohamed Mahmoud GOMAAb( )Hussein DARWISHa
Glass Research Department, National Research Centre, Dokki, Cairo, Egypt
Geophysical Sciences Department, National Research Centre, Dokki, Cairo, Egypt

Abstract

The influence of adding Fe2O3 at the expense of Na2O in sodium lead borate glasses on the structural, physical and electrical properties have been investigated. Results obtained from Fourier transform infrared (FTIR) spectra indicated that Fe2O3 plays an important role in converting three coordinated boron atoms [BO3] to four coordinated boron atoms [BO4]. The physical properties such as density and molar volume helped to evaluate the compact structure of the prepared glass samples due to presence of [BO4] groups. The increase of Fe2O3/Na2O replacements led to increasing the microhardness values and decreasing the thermal expansion coefficients of the studied glasses. The increase of Fe2O3/Na2O replacements generally decreased the AC conductivity. That decrease might be due to converting of the three coordinated boron atoms [BO3] to four coordinated boron atoms [BO4]. Dielectric constants of the samples might be an indication of the distortion in the coordinated boron atoms. The obtained experimental data indicated the internal structure of glass network and the change of the structure of the samples from three [BO3] to four coordinated boron atoms [BO4].

Keywords:

borate glasses, Fourier transform infrared (FTIR) spectra, microhardness, thermal expansion, AC electrical properties
Received: 19 March 2014 Revised: 24 April 2014 Accepted: 27 April 2014 Published: 01 June 2014 Issue date: June 2014
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Publication history

Received: 19 March 2014
Revised: 24 April 2014
Accepted: 27 April 2014
Published: 01 June 2014
Issue date: June 2014

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