Fe-dependent structural evolution of peralkaline soda aluminosilicate glasses

Iron speciation vs. glass transition

authored by

Michele Cassetta, Emanuele De Bona, Alessia Sambugaro, Francesco Enrichi, Nicola Daldosso, Beatrice Giannetta, Claudio Zaccone, Mattia Biesuz, Vincenzo M. Sglavo, Renat Almeev, Luca Nodari, Daniele Giordano, Gino Mariotto

Abstract

The incorporation of iron into peralkaline silicate glasses significantly impacts their structural and thermal properties. Here we investigate how addition of iron influences the network connectivity (short- and medium-range order) and glass transition temperature (T_g) with particular regard to the iron speciation and the Fe²⁺ and Fe³⁺ coordination state. We also found a sort of tipping point in iron concentration beyond which the short-range structures evolve linearly with density while the medium-range structure deviates from linearity. This behavior seems related to a re-enrichment of tetrahedral units triggered by iron self-compensation effect explaining the observed jump in T_g.

Organisation(s)

Institute of Earth System Sciences

External Organisation(s)

University of Turin
University of Verona
University of Trento
University of Foggia
Istituto Nazionale Di Geofisica E Vulcanologia, Rome
National Research Council Italy (CNR)
Institute of Geosciences and Earth Resources (IGG), Pisa Section

Type

Article

Journal

Chemical geology

Volume

674

No. of pages

10

ISSN

0009-2541

Publication date

20.02.2025

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Geology, Geochemistry and Petrology

Electronic version(s)

https://doi.org/10.1016/j.chemgeo.2024.122561 (Access: Open)