Experimental study of the thermal expansion of (AgI)_0.67(Ag₂MoO₄)_0.33 ionic glass from 5 K to 300 K

Abstract

The thermal expansion of the ionically conducting silver iodide–silver molybdate glass (AgI)_0.67(Ag₂MoO₄)_0.33 was investigated from low temperatures up to about the glass transition region using a capacitance dilatometer via a quasi-adiabatic method. The results do not show any anomalous behaviour in a temperature range where the existence of relaxation processes with peculiar features was previously revealed using mechanical spectroscopy, but rather a monotonic increase of positive values of the thermal expansion coefficient.

Keywords:

• thermal expansion
• ionic glasses
• molybdate glasses
• dilatometry
• silver iodide
• fast ionic conductors

Acknowledgements

This work was partially supported by the Spanish Ministry of Education and Science within project FIS2006-01117. The authors thank gratefully Andres Buendia for his help with the experimental equipment and Dr. Francesco Rocca for fruitful discussion.