2004年10月
Effect of calcium additive on structural changes under heat treatment in sodium borosilicate glasses
JOURNAL OF NON-CRYSTALLINE SOLIDS
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- 巻
- 345
- 号
- 開始ページ
- 99
- 終了ページ
- 103
- 記述言語
- 英語
- 掲載種別
- DOI
- 10.1016/j.jnoncrysol.2004.08.003
- 出版者・発行元
- ELSEVIER SCIENCE BV
The effect of calcium additive on structural change and phase separation behavior in response to heat treatment in 9.4Na(2)O-25.4B(2)O(3)-65.2SiO(2)-xCaO (mol%) glass, where x was from 0 to 15mol%, was investigated using B-11 NMR, Si-29 MAS NMR and SEM. With increasing CaO content, the fraction of four-coordinated boron showed a dramatic increase up to x = 2% but only slight increase at above x = 5%. Interestingly, four-coordinated boron showed no significant increase in response to heat treatment at below x = 2 mol%, but a clear increase at above x = 5 mol%. These changes can be explained by a model in which calcium ions are confined to borate units in samples with low calcium content, but begin to form Si-O-Ca2+-O--Si or Si-O-Ca2+-O--B units in samples with high calcium content, which also agrees with the results of Si-29 MAS NMR spectra. Here we discuss the relationship between the reduced size of the phase-separation structure in samples with calcium added and the formation of Si-O-Ca2+-O--B units. (C) 2004 Elsevier B.V. All rights reserved.
- リンク情報
- ID情報
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- DOI : 10.1016/j.jnoncrysol.2004.08.003
- ISSN : 0022-3093
- CiNii Articles ID : 80017050463
- Web of Science ID : WOS:000225583200018