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College Park, Maryland      June 6 - 10 , 2004

TP17: Neutron Diffraction Studies on the Superionic-conducting Composite (AgI)0.6(NaPO3)0.4

E. Kartini (R & D Center for Materials Science and Technology, National Nuclear Energy Agency, Tangerang 15314, Indonesia), M.F. Collins (Deparment of Physics and Astronomy, McMaster University, Hamilton. ON, Canada), A. Purwanto (R & D Center for Materials Science and Technology, National Nuclear Energy Agency, Tangerang 15314, Indonesia; Neutron Science Laboratory, KEK, Tsukuba, Japan), T. Kamiyama (Neutron Science Laboratory, KEK, Tsukuba, Japan), K. Itoh (Kyoto University Research Reactor Institute, Kumatori-cho, Japan), T. Sakuma (Department of Physics, Ibaraki University, Mito, Japan)

Superionic conductors are of considerable interest from both application and fundamental point of view. An ionic conductivity of at least 10-3 S/cm is needed for use in solid electrolytes, batteries, fuel cells and sensors. We have successfully made a new superionic composite (AgI)0.6(NaPO3)0.4 by melt quenching. This material exhibits a high ionic conductivity of about 2 x 10-3 S/cm at ambient temperature, whereas the conductivity of crystalline AgI and NaPO3 glass are orders of magnitude lower. (AgI)0.6(NaPO3)0.4 is a composite material containing both crystalline and glass phases. To understand the ionic conduction mechanism two neutrons experiments have been performed. Firstly to investigate the crystalline phase measurements have been made by the high-resolution powder diffractometer VEGA, and secondly, the structure factor of the glass phase has been measured by the time of flight High Intensity Total Scattering instrument (HIT-II). Both measurements were performed at the Neutron Science Laboratory (KENS), KEK, Japan.

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