Title

The Properties and Structure of Zinc Magnesium Phosphate Glasses

Abstract

Zn-Mg-phosphate (ZMP) glasses, including those with the nominal molar compositions (50 - x)ZnO xMgO 50P2O5 (0 ≥ x ≥ 50) and (60 - y)ZnO yMgO 40P2O5(0 ≥ y ≥ 60), were prepared and properties such as density, refractive index, coefficient of thermal expansion and glass transition temperature (Tg), were measured. The glass transition temperature increases by 100-150 [degree]C and the room temperature dissolution rates in water decrease by 1-2 orders of magnitude when MgO replaces ZnO while maintaining a constant P2O5 content. Glass structures were characterized by Raman spectroscopy and there were no significant changes in the phosphate anion distributions when MgO replaces ZnO. The significant changes in properties cannot be explained by a simple cation field strength argument since Mg2+ and Zn2+ have similar sizes; instead, the effect of 3d electrons on the nature of the bonds between Zn2+ ions and non-bridging oxygens on the phosphate tetrahedra must be considered.

Department(s)

Materials Science and Engineering

Comments

The authors acknowledge the Department of Education for the Graduate Assistance in Areas of National Need (GAANN) fellowship and the National Science Foundation (DMR 1207520 ) for funding this work.

Keywords and Phrases

Divalent Cations; Electron Configurations; Thermal Properties; Zinc Magnesium Phosphates; Zinc Phosphate Glasses

International Standard Serial Number (ISSN)

0022-3093

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2014 Elsevier B.V., All rights reserved.

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