Europhys. Lett.
Volume 75, Number 5, September 2006
Page(s) 778 - 783
Section Condensed matter: structural, mechanical and thermal properties
Published online 02 August 2006
Europhys. Lett., 75 (5), pp. 778-783 (2006)
DOI: 10.1209/epl/i2006-10173-x

Anomalous electrical switching behaviour in phase-separated bulk $\chem{Ge\tx{-}Se\tx{-}Ag}$ chalcogenide glasses

Pulok Pattanayak and S. Asokan

Department of Instrumentation, Indian Institute of Science Bangalore 560012, India

received 19 April 2006; accepted in final form 13 July 2006
published online 2 August 2006

Bulk, Se-rich $\chem{Ge_{0.15}Se_{0.85-{\it x}}Ag_{\it x}}$ ( $0 \le
x \le 0.20$) glasses show anomalous electrical switching behaviour which is attributed to difference in the thermal conductivities of $\chem{Ag_{2}Se}$ inclusions and GeSe base glass. The present results also show that there is a sharp drop in switching voltage with silver addition, which is due to the higher metallicity of silver and the presence of $\ab{Ag}^{+}$ ions. Further, the leveling of threshold voltage ($V_\ab{T}$) around x = 0.10, is associated with the percolation of $\chem{Ag_{2}Se}$ phase in the Ge-Se matrix.

61.43.Fs - Glasses.
64.75.+g - Solubility, segregation, and mixing; phase separation.
72.60.+g - Mixed conductivity and conductivity transitions.

© EDP Sciences 2006