Influence of Fe<sub>2</sub>O<sub>3</sub> on the physical, structural and electrical properties of sodium lead borate glasses

doi:10.1007/s40145-014-0107-z

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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].

Key words： borate glasses Fourier transform infrared (FTIR) spectra microhardness thermal expansion AC electrical properties

Received: 19 March 2014 Published: 12 June 2015

Corresponding Authors: Mohamed Mahmoud GOMAA

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	Safeya IBRAHIM
	Mohamed Mahmoud GOMAA
	Hussein DARWISH

Cite this article:

Safeya IBRAHIM,Mohamed Mahmoud GOMAA,Hussein DARWISH. Influence of Fe₂O₃ on the physical, structural and electrical properties of sodium lead borate glasses[J]. Journal of Advanced Ceramics, 2014, 3(2): 155-164.

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http://jac.tsinghuajournals.com/EN/10.1007/s40145-014-0107-z OR http://jac.tsinghuajournals.com/EN/Y2014/V3/I2/155

A schematic representation of the sample holder.

Chemical composition, density, molar volume, average boron–boron separation and microhardness of the investigated glasses

Composition dependence of density and molar volume for the studied glasses.

Infrared transmission spectra of Fe₂O₃–Na₂O–PbO–B₂O₃ glasses.

Glass transition temperature, dilatometric softening temperature, thermal expansion coefficient, average coordination number and number of bonds per unit volume of the glass samples

Variation of thermal expansion coefficient of the glasses as a function of Fe₂O₃ content.

Conductivity variation with frequency for samples G₁ (◆),G₂ (●), G₃ (▲) and G₄ (★).

Dielectric constant variation with frequency for samples G₁ (◆),G₂ (●), G₃ (▲) and G₄ (★).

Imaginary impedance variation with real impedance for samples G₁ (◆), G₂ (●), G₃ (▲) and G₄ (★).

Cg and R∞ are the capacitance and resistance of the sample at high frequency, respectively; Ci is the interfacial capacitance and Ri is the interfacial resistance).">

Equivalent circuit that represents the sample (Cg and R∞ are the capacitance and resistance of the sample at high frequency, respectively; Ci is the interfacial capacitance and Ri is the interfacial resistance).

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