Ionic Motion and Structure of Ion Conductive Glasses
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IONIC MOTION AND STRUCTURE OF ION CONDUCTIVE GLASSES T. Akai, M. Yamashita, H, Yamanaka, and H. Wakabayashi. Optical Material Department, Osaka National Research Institute, AIST* 1-8-3 1,Midorigaoka, Ikeda, 563, Japan. ABSTRACT The dynamic structure of xLi2S-Ga2S3-6GeS2 (x=4 and 6) glasses has been investigated by 7Li nuclear magnetic resonance. In two samples similar values of spin-lattice relaxation time (Ti) were obtained. The relaxation mechanism at 20MHz and 78MHz is therefore attributed to the local motion of lithium ions. In the glass corresponding to x=6, which shows higher conductivity, the slow motion of ions showing an activation energy of 24.3kJ/mol has been detected by the spinlattice relaxation time in the rotating frame (Tip). This value is comparable to the activation energy determined by the conductivity. The existence of this mode is supported by the motional narrowing of the line width which is sensitive to the motion less than 10kHz. INTRODUCTION In the last decade, much attention has been concentrated on the use of solid state lithium ion conductors as an appropriate element for microbatteries [1]. Since Ribes et al. proved the high conductivity of alkali-containing sulfide glasses in 197812], numerous sulfide glass systems such as Li 2S- SiS2[31, Li 2 S-B 2 S3[4], Li 2S-P 2 S5[5] have been prepared. The characteristic conductivity of these sulfide glasses is as high as 10- 3 Scm-I - 10-4 Scm-I at room temperature. The xLi 2S - (1-x)GeS 2 system is also known to form a glass over the range 0
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