College Park, Maryland June 6 - 10 , 2004 |
WP60: Structure and Dynamic of the Superionic Conductor AgI-Ag2S-AgPO3 measured by HIT-II at KENS and MARI at ISIS.
E. Kartini (R & D Center for Materials Science and Technology, National Nuclear Energy Agency, Tangerang 15314, Indonesia), M. Arai, H. Iwase (Neutron Science Laboratory, KEK, Tsukuba, Japan), K. Itoh (Kyoto University Research Reactor Institute, Kumatori-cho, Japan), S Bennington (ISIS, Rutherford Appleton Laboratory), M.F. Collins (Department of Physics and Astronomy, McMaster University, Hamilton, ON, Canada), S.J. Kennedy (Bragg Institute, Australian Nuclear Science and Technology Organisation, Australia)
Superionic conducting glasses are of considerable technological interest because of their use in batteries, displays, sensors and fuel-cells. One of the main scientific challenges is to explain how the disordered structure of the mixture is related to the high ionic conductivity that can be achieved at ambient temperature. This work presents the relation between the ionic conductivity on the superionic glasses AgI-Ag2S-AgPO3 and the appearance of a prepeak at low Q~0.6-0.9 Å-1 in the structure factor S(Q) measured by a time-of flight HIT-II instruments at KENS, Japan and the existence of Boson Peaks at low E~2.5 meV in the dynamic structure factor S(Q,E) measured by the time-of flight MARI instrument at ISIS, UK. These materials exhibited good conductivity at ambient temperatures. With increasing mol % of AgI+Ag2S, the results show (i) rapidly increasing conductivity (ii) slowly decreasing glass transition temperature (iii) increasing intensity and decreasing Q of the prepeak (iv) increasing the intensity and decreasing energy of the Boson peak. There is a strong correlation between the ionic conductivity and the existence and intensity of both the prepeak and the Boson peak.
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