Na⁺ -ION CONDUCTION PROPERTIES OF GLASS-CERAMIC NARPSIO IN THE Y-Sm MIXED SYSTEM

抄録

The glass-ceramics of the phosphorus induced Na₅RESi₄O₁₂-type (RE=rare earth) Na+ -superionic conductors (Narpsio-V) in the Y-Sm mixed system Na₂O-Y₂O₃-Sm₂O₃-P₂O₅-SiO₂ were prepared by crystallization of glasses with the composition Na_3+3x-yY_(1-x)/2 Sm_(1-x)/2 P_ySi_3-yO₉. The optimum conditions for crystallization were discussed with reference to the conduction properties and the preparation of uncracked bulky glass-ceramic Narpsio-V. The ionic conductivity of the glass-ceramic Na_4.1Y_0.25Sm_0.25P_0.4Si_2.6O₉ was 2.8×10^-2 S/cm at 300°C.