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Home  >  Journal list  >  Journal of the Ceramic Society of Japan ( 2003 - 2007 )  >  Vol.114  No.1329 (May) (2006)  >  pp.380-385

Journal of the Ceramic Society of Japan ( 2003 - 2007 )
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Volume Change of β-Spodumene s.s. Glass-Ceramics Due to Structural Relaxation

Akihiko SAKAMOTO1) and Shigeru YAMAMOTO1)
1) Technical Division, Nippon Electric Glass

  The high-temperature dimensional stability of β-spodumene solid solution (s.s.) glass-ceramics with different crystallinities was investigated. It was demonstrated that the glass-ceramics show volume change due to structural relaxation in the residual glass phase regardless of crystallinity, even in the specimen with a high crystallinity of 90 vol%. The volume change process was expressed by the Kohlrausch-Williams-Watts (KWW) function. In the specimens with lower crystallinity (52, 71 vol%), normal relaxation behavior like that of non-crystalline glasses was observed, with activation energies of 599 and 414 kJ/mol, respectively. In contrast, the specimen with a crystallinity of 90 vol% showed an anomalous relaxation behavior accompanied with a densification limit and lower activation energy (250 kJ/mol). This anomalous behavior was attributed to the inner friction caused by proximity of the crystal grains in the glass-ceramic, which may result in a blocking effect on the volume shrinkage. We predicted the long-term dimensional stability of a precision glass-ceramic capillary for fiber-optic devices, based on the relaxation data in the KWW function.



Keyword:
Glass-ceramic, Structural relaxation, Crystallinity, Densification limit, Inner friction, Dimensional stability

Received: December 21, 2005
Accepted: April 19, 2006 , Published online: May 01, 2006
Copyright (c) 2006 The Ceramic Society of Japan

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