Synthesis of powellite-rich glasses for high level waste immobilization

Tatiana Taurines (1) , Bruno Boizot (1)

1 LSI - Laboratoire des Solides Irradiés

Increasing amounts of MoO3 were added to SiO2-B2O3-Na2O-CaO-Al2O3 glasses in order to trap molybdenum as powellite (nominally CaMoO4). Different heat treatments were performed to study their influences on powellite crystallization by X-ray diffraction and EPR. The glass compositions studied in this work lead to glass-ceramics rich in CaMoO4, up to [MoO3] = 5 mol% no poorly durable Na2MoO4 phase was identified by XRD. Trivalent actinides surrogates (Gd3+) were observed to incorporate into CaMoO4 crystals.

Keywords: Molybdenum; Glass-ceramic; Powellite; XRD; EPR

Domains: Physics [physics]; Condensed Matter [cond-mat]; Materials Science [cond-mat.mtrl-sci]

Tatiana Taurines, Bruno Boizot. Synthesis of powellite-rich glasses for high level waste immobilization. Conference on the Structure of Non-Crystalline Materials (NCM11), Jun 2010, Paris, France. pp.2723-2725, ⟨10.1016/j.jnoncrysol.2011.02.024⟩. ⟨hal-00599090⟩