Abstract
Iodine surface diffusion coefficient in some Ag + ion based superionic solid films has been measured by observing the radial movement of iodine under a metallurgical microscope. The values of surface diffusion coefficient for Ag 7 I 4 PO 4 , NH 4 Ag 4 I 5 and [(CH 3 ) 4 N] 2 Ag 13 I 15 are 2×10 -8 cm 2 /sec, 6.3×10 -8 cm 2 /sec and 7.8×10 -6 cm 2 /sec, respectively at 25°C. The low value of iodine diffusion coefficient for Ag 7 I 4 PO 4 , makes it a good material for film solid state battery.
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