Abstract
Lithium rare-earth silicate glasses, (Li2O)35.7(RE2O3)7.2(SiO2)57.1 (RE=Sm, Gd, Dy, Ho, Y, Er and Yb), were prepared by melting a mixture of Li2CO3, RE2O3 and SiO2 under the composition ratio of each component. The density was increased with increasing the atomic weight of RE. Three differential thermal analysis (DTA) exothermic peaks (Tc(I), Tc(II) and Tc(III)), attributed to crystallization, were observed in the temperature range of 650 to 880°C. The powder X-ray diffraction analysis indicated that Li2SiO3, (Li2SO3+RE2Si2O7+RE2SiO5) and (Li2SO3+RE2Si2O7) formed around Tc(I), Tc(II) and Tc(III), respectively. The conductivity of (Li2O)35.7(RE2O3)7.2(SiO2)57.1 glass was found to increase about two orders of magnitude over that of the corresponding Li5YSi4O12 ceramic.
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