Thermal Stability of Na₂O-FeO-Fe₂O₃-P₂O₅ Glasses

Author

Lina Ma
Richard K. Brow, Missouri University of Science and TechnologyFollow
Luciana Ghussn
Mark E. Schlesinger, Missouri University of Science and TechnologyFollow

Abstract

The crystallization tendencies of five series of Na₂O-FeO-Fe₂O₃-P₂O₅ (NFP) glasses with different O/P (3.0-3.5) and Fe/P (0.13-0.67) ratios were studied. Characteristic temperatures, including the glass transition temperature (T_g) and crystallization temperature (T_x^h), were obtained using differential thermal analysis (DTA), and liquidus temperatures (T_L) were determined by microscopic evaluation of heat-treated samples. The compositional dependence of glass structure and the characteristic temperatures are discussed. The glass stability (GS) against crystallization is described using parameters based on the characteristic temperatures. For the glass series with O/P ratios near the pyrophosphate composition (O/P ~ 3.5), the glass stability goes through a minimum value around Fe/P ~ 0.3 to 0.4, which corresponds to the crystalline phase NaFeP₂O₇ and Na₇Fe₃(P₂O₇)₄.

Recommended Citation

L. Ma et al., "Thermal Stability of Na₂O-FeO-Fe₂O₃-P₂O₅ Glasses," Journal of Non-Crystalline Solids, vol. 409, pp. 131 - 138, Elsevier, Feb 2015.

The definitive version is available at https://doi.org/10.1016/j.jnoncrysol.2014.11.019

Department(s)

Materials Science and Engineering

International Standard Serial Number (ISSN)

0022-3093; 1873-4812

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2015 Elsevier, All rights reserved.

Publication Date

01 Feb 2015