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. Magic-angle spinning nuclear magnetic resonance of 11B, 29Si and 27Al has been used to study the distribution of nonbridging oxygen atoms (NBO) in an alkali borosilicate glass to which surrogate oxides for high-level radioactive waste have been added. The properties of such glasses are shown to depend on the fraction N4 of four-coordinated boron atoms (B4) and on the fraction of silicate tetrahedra...
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