Structural investigations of borosilicate glasses containing MoO3 by MAS NMR and Raman spectroscopies

被引：107

作者：

Caurant, D. ^{[1
]}

Majerus, O. ^{[1
]}

Fadel, E. ^{[1
]}

Quintas, A. ^{[1
]}

Gervais, C. ^{[2
]}

Charpentier, T. ^{[3
]}

Neuville, D. ^{[4
]}

机构：

[1] Ecole Natl Super Chim Paris ENSCP, ParisTech, Lab Chim Mat Condensee Paris, CNRS,UMR 7574, F-75231 Paris, France

[2] Univ Paris 06, Lab Chim Mat Condensee Paris, CNRS, UMR 7574, F-75252 Paris, France

[3] CEA, IRAMIS, CEA Saclay, Serv Interdisciplinaire Syst Mol & Mat, F-91191 Gif Sur Yvette, France

[4] Inst Phys Globe, CNRS, UMR 7047, F-75252 Paris, France

来源：

JOURNAL OF NUCLEAR MATERIALS | 2010年 / 396卷 / 01期

关键词：

NUCLEAR-WASTE GLASSES; CRYSTAL-STRUCTURES; SILICATE-GLASSES; OXIDATION-STATE; LOCAL-STRUCTURE; MOLYBDENUM; CRYSTALLIZATION; SYSTEM; TEMPERATURE; SPECTRA;

D O I：

10.1016/j.jnucmat.2009.10.059

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High molybdenum concentration in glass compositions may lead to alkali and alkaline-earth molybdates crystallization during melt cooling that must be controlled particularly during the preparation of highly radioactive nuclear glassy waste forms. To understand the effect of molybdenum addition on the structure of a simplified nuclear glass and to know how composition changes can affect molybdates crystallization tendency, the structure of two glass series belonging to the SiO2-B2O3-Na2O-CaO-MoO3 system was studied by Si-29, B-11, Na-23 MAS NMR and Raman spectroscopies by increasing MoO3 or B2O3 concentrations. Increasing MoO3 amount induced an increase of the silicate network reticulation but no significant effect was observed on the proportion of BO4- units and on the distribution of Na+ cations in glass structure. By increasing B2O3 concentration, a strong evolution of the distribution of Na+ cations was observed that could explain the evolution of the nature of molybdate crystals (CaMoO4 or Na2MoO4) formed during melt cooling. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：94 / 101

页数：8

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