Microwave crystallization of Li_2O centre dot 2SiO_2 was investigated. The crystal growth rate in microwave crystallization was greater than in conventional crystallization. The microwave heating rate of glass was compared to that of the fully crystalized glass-ceramics. Dielectric properties as a function of temperature of the glass-ceramic also were investigated. The glassy phase exhibited higher dielectric constant and losses than those of the fully crystallized glass-ceramics. For a nucleated glass sample, the dielectric properties changed with the phase transformation. Results from the analysis of microwave power distribution at the interface between the glass and crystal suggested that a multimode microwave applicator was suitable for uniform crystal growth.
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