Effect of PbO on the elastics properties of borate and phosphate glass system

The effect of PbO on the elastic properties phosphate of glass and borate glass system has been studied. A series of lead borate glasses [PbOx. (0.10 ≤ X ≤ 0.60)] were successfully synthesized. By using ultrasonic measurement system, the velocities of the propagated waves attained could be use...

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Main Author:	Kasim, Azman
Format:	Thesis
Language:	English English
Published:	2000
Subjects:	Borates - Elastic properties Phosphates - Elastic properties
Online Access:	http://psasir.upm.edu.my/id/eprint/9124/1/FSAS_2000_31%20IR.pdf
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id	my-upm-ir.9124
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spelling	my-upm-ir.91242024-04-01T04:20:01Z Effect of PbO on the elastics properties of borate and phosphate glass system 2000-07 Kasim, Azman The effect of PbO on the elastic properties phosphate of glass and borate glass system has been studied. A series of lead borate glasses [PbOx. (0.10 ≤ X ≤ 0.60)] were successfully synthesized. By using ultrasonic measurement system, the velocities of the propagated waves attained could be used to estimate the elastic properties of glass. In this studies, the velocities of propagated waves in lead borate and lead phosphate are found to decrease with the mole fraction of PbO. Meanwhile, the addition of PbO increases the density of g lasses. It shows that lead borate and lead phosphate glasses become more rigid but undergone a weakening structure. Hence, an addition of PbO will affect the elastic properties of glass. From the experimental results 'the elastic modulus C11 and C44, Young's modulus (E); bulk modulus (8) and Poisson ratio (0) are also found to vary with the mole fraction of PbO. The Oebye temperatures, which describe the thermal behaviour for isotropic materials such as glass also show a decreasing trend with the mole fraction of PbO. It seems that an addition of PbO into the borate and phosphate g lass systems changes the coordination of the glass structure and weakens the g lass network by the increase of non-bridging oxygens (N 80s). From the structural aspect, the lead borate glass consists of 803 and 804 units, which change markedly with the PbO content. At low PbO concentration (x ≤ 0.15), lead is assumed to assist in the formation of 804 tetrahedral. Whereas, for high PbO content (x> 0.15), some of lead act to form Pb04 pyramid. Meanwhile, for lead phosphate glasses , since the basic structure is Pb04 tetrahedral, hence an increment of PbO content tend to reduce the number of cross-linking P-O-P bonds between pairs of tetrahedral and increase the number of chains of P04 tetrahedral. Borates - Elastic properties Phosphates - Elastic properties 2000-07 Thesis http://psasir.upm.edu.my/id/eprint/9124/ http://psasir.upm.edu.my/id/eprint/9124/1/FSAS_2000_31%20IR.pdf text en public masters Universiti Putra Malaysia Borates - Elastic properties Phosphates - Elastic properties Faculty of Science and Environmental Studies Ab. Aziz, Sidek English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
advisor	Ab. Aziz, Sidek
topic	Borates - Elastic properties Phosphates - Elastic properties
spellingShingle	Borates - Elastic properties Phosphates - Elastic properties Kasim, Azman Effect of PbO on the elastics properties of borate and phosphate glass system
description	The effect of PbO on the elastic properties phosphate of glass and borate glass system has been studied. A series of lead borate glasses [PbOx. (0.10 ≤ X ≤ 0.60)] were successfully synthesized. By using ultrasonic measurement system, the velocities of the propagated waves attained could be used to estimate the elastic properties of glass. In this studies, the velocities of propagated waves in lead borate and lead phosphate are found to decrease with the mole fraction of PbO. Meanwhile, the addition of PbO increases the density of g lasses. It shows that lead borate and lead phosphate glasses become more rigid but undergone a weakening structure. Hence, an addition of PbO will affect the elastic properties of glass. From the experimental results 'the elastic modulus C11 and C44, Young's modulus (E); bulk modulus (8) and Poisson ratio (0) are also found to vary with the mole fraction of PbO. The Oebye temperatures, which describe the thermal behaviour for isotropic materials such as glass also show a decreasing trend with the mole fraction of PbO. It seems that an addition of PbO into the borate and phosphate g lass systems changes the coordination of the glass structure and weakens the g lass network by the increase of non-bridging oxygens (N 80s). From the structural aspect, the lead borate glass consists of 803 and 804 units, which change markedly with the PbO content. At low PbO concentration (x ≤ 0.15), lead is assumed to assist in the formation of 804 tetrahedral. Whereas, for high PbO content (x> 0.15), some of lead act to form Pb04 pyramid. Meanwhile, for lead phosphate glasses , since the basic structure is Pb04 tetrahedral, hence an increment of PbO content tend to reduce the number of cross-linking P-O-P bonds between pairs of tetrahedral and increase the number of chains of P04 tetrahedral.
format	Thesis
qualification_level	Master's degree
author	Kasim, Azman
author_facet	Kasim, Azman
author_sort	Kasim, Azman
title	Effect of PbO on the elastics properties of borate and phosphate glass system
title_short	Effect of PbO on the elastics properties of borate and phosphate glass system
title_full	Effect of PbO on the elastics properties of borate and phosphate glass system
title_fullStr	Effect of PbO on the elastics properties of borate and phosphate glass system
title_full_unstemmed	Effect of PbO on the elastics properties of borate and phosphate glass system
title_sort	effect of pbo on the elastics properties of borate and phosphate glass system
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Science and Environmental Studies
publishDate	2000
url	http://psasir.upm.edu.my/id/eprint/9124/1/FSAS_2000_31%20IR.pdf
_version_	1804888545685405696

Effect of PbO on the elastics properties of borate and phosphate glass system

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