Zinc Borophosphate Glasses Doped with Molybdenum Oxide

Jiří Šubčík; Ladislav Koudelka; Petr Mošner; Zdeněk Černošek

doi:10.4028/www.scientific.net/AMR.39-40.97

Paper Titles

The Effect of CaO and MgO on Physical Properties of MgO-CaO-B₂O₃-Al₂O₃-SiO₂ Glasses with Composition Close to the E-Glass Fibers
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First Principles Molecular Simulations of Soda-Lime-Silica Glass
p.85

Volumetric Changes Between Different Conformations of Two SiOH Groups in SiO₂ Glass
p.89

The Yttria-Alumina Glasses - MD and TD Models
p.93

Zinc Borophosphate Glasses Doped with Molybdenum Oxide
p.97

The Structure-Property Relationship in Oxide Glasses: A Thermodynamic Approach
p.103

Transport and Relaxation Study of Ionic Phosphate Glasses
p.111

Glass as Solid Non-Equilibrium Phase under Negative Pressure
p.117

New Paradigm of Glass Structure and Physicochemical Essence of Glass Transition
p.123

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Zinc Borophosphate Glasses Doped with Molybdenum Oxide

Abstract:

The glasses of the series (1-x)[0.5ZnO-0.1B2O3-0.4P2O5]-xMoO3 with 0 ≤ x ≤ 0.6 were prepared by slow cooling of the melt. These glasses were characterized by the measurements of density, molar volume, chemical durability, glass transition temperature and the thermal expansion coefficient. The density and molar volume of the glasses increase with increasing MoO3 content. All glasses crystallize on heating and their crystallization temperature decreases with increasing MoO3 content. An incorporation of MoO3 into the parent borophosphate glass results in a substantial decrease of their glass transition temperature and also of their chemical durability. The observed changes were ascribed to the gradual replacement of stronger P-O-P bonds by weaker Mo- O-P and Mo-O-Mo bonds. ESR spectra revealed the presence of Mo5+ ions responsible for the blue colour of the glasses and the relative ratio of Mo5+/Mototal decreases with increasing MoO3 content.