Interaction between Cr-bearing pigments and transparent glaze: A transmission electron microscopy study - Sorbonne Université Accéder directement au contenu
Article Dans Une Revue Journal of Non-Crystalline Solids Année : 2017

Interaction between Cr-bearing pigments and transparent glaze: A transmission electron microscopy study

Résumé

Spinel ZnAl2O4 and corundum Al2O3 doped with chromium are used as pink pigments in porcelain glazes. However, alteration of the color can occur during firing, and the resulting glaze appears brown and green respectively, instead of the expected pink. To investigate the mechanism of color change, electron transparent sections were prepared by Focused Ion Beam (FIB) at the interface between pigment and glaze. Observations under a transmission electron microscope (TEM) reveal a common mechanism for both systems. Al migration from the pigment toward the silicate melt results in alteration of the grain of pigments, and formation of a Cr enriched phase, with the same crystalline structure than the initial pigment. Furthermore, the formation of anorthite is reported, due to the increase of the local concentration of Al in the melt. The different morphologies of altered grains of pigment encountered in the glaze are discussed base on the TEM observations.

Domaines

Chimie
Fichier principal
Vignette du fichier
Verger_2017_Interaction_between.pdf (892.3 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01458161 , version 1 (06-02-2017)

Identifiants

Citer

Louisiane Verger, Olivier Dargaud, Nicolas Menguy, David Troadec, Laurent Cormier. Interaction between Cr-bearing pigments and transparent glaze: A transmission electron microscopy study. Journal of Non-Crystalline Solids, 2017, 459, pp.184 - 191. ⟨10.1016/j.jnoncrysol.2017.01.016⟩. ⟨hal-01458161⟩
277 Consultations
415 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More