Lithium rare-earth silicate glasses, (Li
2O)
35.7(RE
2O
3)
7.2(SiO
2)
57.1 (RE=Sm, Gd, Dy, Ho, Y, Er and Yb), were prepared by melting a mixture of Li
2CO
3, RE
2O
3 and SiO
2 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 Li
2SiO
3, (Li
2SO
3+RE
2Si
2O
7+RE
2SiO
5) and (Li
2SO
3+RE
2Si
2O
7) formed around
Tc(I),
Tc(II) and
Tc(III), respectively. The conductivity of (Li
2O)
35.7(RE
2O
3)
7.2(SiO
2)
57.1 glass was found to increase about two orders of magnitude over that of the corresponding Li
5YSi
4O
12 ceramic.
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