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Article Dans Une Revue Materials Letters Année : 2022

Redox-induced crystallisation in Ti-bearing glass-forming melts: a Ti K-edge XANES study

Mariona Tarrago
  • Fonction : Auteur
Charles Le Losq
  • Fonction : Auteur
Thibaut Robine
  • Fonction : Auteur
Solenn Reguer
  • Fonction : Auteur
Dominique Thiaudière
  • Fonction : Auteur

Résumé

Ti is usually tetravalent in silicate glasses. It may be trivalent under very reduced conditions, but this remains unclear. In this study, in situ Ti K-edge XANES experiments were performed on four different Tibearing melts, equilibrated at high temperatures using a micro-furnace with controlled atmosphere. No formation of Ti 3+ was observed, even at fO 2 ~ 10-15 (estimated). Instead, systematic crystallization of the melts was observed. In experiments at fO 2 ≤ 10-12 , the system favours Ti 4+ crystallization instead of reduction to Ti 3+ in the studied melts. Fluxing melts with reduced gas mixtures, like Ar-2% H 2 , may be a novel way to induce surface crystallisation and produce ceramic-coated glass materials.
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Dates et versions

hal-03857140 , version 1 (17-11-2022)

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Mariona Tarrago, Charles Le Losq, Thibaut Robine, Solenn Reguer, Dominique Thiaudière, et al.. Redox-induced crystallisation in Ti-bearing glass-forming melts: a Ti K-edge XANES study. Materials Letters, 2022, 319, pp.132296. ⟨10.1016/j.matlet.2022.132296⟩. ⟨hal-03857140⟩
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