MISC

2004年10月

Effect of calcium additive on structural changes under heat treatment in sodium borosilicate glasses

JOURNAL OF NON-CRYSTALLINE SOLIDS
  • H Miyoshi
  • ,
  • D Chen
  • ,
  • H Masui
  • ,
  • T Yazawa
  • ,
  • T Akai

345
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
DOI
https://doi.org/10.1016/j.jnoncrysol.2004.08.003
CiNii Articles
http://ci.nii.ac.jp/naid/80017050463
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000225583200018&DestApp=WOS_CPL
ID情報
  • DOI : 10.1016/j.jnoncrysol.2004.08.003
  • ISSN : 0022-3093
  • CiNii Articles ID : 80017050463
  • Web of Science ID : WOS:000225583200018

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