Effect of compositional variations on charge compensation of AlO4 and BO4 entities and on crystallization tendency of a rare-earth-rich aluminoborosilicate glass

被引：52

作者：

Quintas, A. ^{[1
]}

Caurant, D. ^{[1
]}

Majerus, O. ^{[1
]}

Charpentier, T. ^{[2
]}

Dussossoy, J-L ^{[3
]}

机构：

[1] ENSCP, CNRS, UMR 7574, Lab Chim Matiere Condensee Paris, F-75231 Paris, France

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

[3] CEA Marcoule, DEN DTCD SCDV, Lab Etud & Dev Matrices Conditionnement, F-30207 Bagnols Sur Ceze, France

来源：

MATERIALS RESEARCH BULLETIN | 2009年 / 44卷 / 09期

关键词：

Glasses; Nuclear magnetic resonance (NMR); Electron microscopy; X-ray diffraction; NUCLEAR-WASTE IMMOBILIZATION; MAS NMR; CERAMICS; BEHAVIOR; CALCIUM; CATION; RATIO; NA; LI;

D O I：

10.1016/j.materresbull.2009.05.009

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This paper presents the structural and crystallization study of a rare-earth-rich aluminoborosilicate glass that is a simplified version of a new nuclear glass proven to be a potential candidate for the immobilization of highly concentrated radioactive wastes that will be produced in the future. In this work, we studied the impact of changing the nature of alkali (Li+, Na+, K+, Rb+, Cs+) or alkaline-earth (Mg2+ Ca2+. Sr2+, Ba2+) cations present in glass composition on glass structure (by Al-27 and B-11 nuclear magnetic resonance spectroscopy) and on its crystallization tendency during melt cooling at 1 K/min (average cooling rate during industrial process). From these composition changes, it was established that alkali cations were preferentially involved in charge compensation of (AlO4)(-) and (BO4)(-) entities in the glassy network comparatively to alkaline-earth cations. Whatever the nature of alkali cations, glass compositions containing calcium gave way to the crystallization of an apatite silicate phase bearing calcium and rare-earth (RE) cations (Ca2RE8(SiO4)(6)O-2, RE = Nd or La) but melt crystallization tendency during cooling strongly varied with the nature of alkaline-earth cations. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：1895 / 1898

页数：4

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