Structural characterization of the ac conductivity in Ag ion conducting glasses
- 144 Downloads
The material trends in various silver ion conducting glasses have been studied recently by focusing on the relationship between the first sharp diffraction peak (FSDP) wave number Q, and the fitting parameters of the ac conductivity, precisely the ratio (log A)/n, where A and n represent the pre-exponential factor and the power law exponent of Jonscher’s law, respectively. In the present paper, a model for the FSDP wave number dependence of the ratio (log A)/n has been proposed and a good agreement has been found with the experiments. By using the concept of bond fluctuation in superionic conductors, the results have been successfully explained, leading to the conclusion that the universal aspect of the power law reflects the universal pattern of the potential barrier at intermediate length scales. The result reconfirms that the ion transport in glasses is intimately related with the FSDP wave number.
KeywordsAg2S Ag2O Superionic Conductor Glassy System Frequency Dependent Conductivity
The authors gratefully acknowledge the Japan Society for the Promotion of Science for the Grant-in-Aid for Scientific Research (No.19560014), and the Ministry of Education, Culture, Sports, Science, and Technology of Japan for the Grant-in-Aid for Scientific Research on Priority Area, “Nanoionics (439)” and for the MONBUKAGAKUSHO-Scholarship.
- 2.Ingram MD (1987) Phys Chem Glasses 28:215Google Scholar
- 7.Mott NF, Davies EA (1979) Electronic processes in non-crystalline materials. Oxford University Press, OxfordGoogle Scholar
- 18.Ndeugueu JL, Aniya M (2008) In: Chowdari BVR et al (eds) Solid state ionics. Macmillan, India, p 401Google Scholar
- 19.Taylor HE (1959) J Soc Glass Technol 43:124TGoogle Scholar
- 37.Kawamura J (1997) In: Iwahara H (ed) Dynamics of fast ions in solids and its evolution for solid state ionics, Report of a Priority Area Research Program supported by The Ministry of Education, Science, Sport and Culture of Japan, p 11Google Scholar