CONDUCTION PROPERTIES OF He⁺-ION IMPLANTED Na₅SmSi₄O₁₂-TYPE GLASS-CERAMICS

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Glass-ceramics of the phosphorus containing Na₅RSi₄O₁₂-type (R=rare earth; Sm) Na⁺-superionic conductors (Narpsio-V) were prepared by crystallization of glasses with the composition Na_3.9Sm_0.6P_0.3Si_2.7O₉. The effects of He⁺ ion implantation are discussed with respect to the conduction properties. Large decrease of ionic conductivity has been observed in the glass-ceramics by ion implantation of He⁺ ions at 200 keV with fluences of 10¹⁴ and 10¹⁵ ions/cm². Upon this implantation the ionic conductivity of the glass-ceramics at 300°C is decreased from 0.534x10^-1 S/cm (before ion implantation) to 0.021×10^-1S/cm (10¹⁴ ions/cm²) and to 0.039×10^-1 S/cm (10¹⁵ ions/cm²).