Fe-dependent structural evolution of peralkaline soda aluminosilicate glasses

Iron speciation vs. glass transition

verfasst von

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.

Organisationseinheit(en)

Institut für Erdsystemwissenschaften

Externe Organisation(en)

Università di Torino
University of Verona
Università degli Studi di Trento
University of Foggia
Istituto Nazionale Di Geofisica E Vulcanologia, Rome
Consiglio Nazionale delle Ricerche (CNR)
Istituto di Geoscienze e Georisorse (IGG), Sezione di Pisa

Typ

Artikel

Journal

Chemical geology

Band

674

Anzahl der Seiten

10

ISSN

0009-2541

Publikationsdatum

20.02.2025

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Geologie, Geochemie und Petrologie

Elektronische Version(en)

https://doi.org/10.1016/j.chemgeo.2024.122561 (Zugang: Offen)