The high-temperature dimensional stability of b-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 volಚ. The volume change process was expressed by the Kohlrausch-Williams-Watts KWW function. In the specimens with lower crystallinity 52, 71 volಚ, normal relaxation behavior like that of non-crystalline glasses was observed, with activation energies of 599 and 414 kJmol, respectively. In contrast, the specimen with a crystallinity of 90 volಚ showed an anomalous relaxation behavior accompanied with a densification limit and lower activation energy 250 kJmol. 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.
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