The European Physical Journal B

, Volume 62, Issue 3, pp 277–280 | Cite as

An evidence for a microscopic phase separation in AsSeAg glasses revealed by thermal and structural investigations

Solids and Liquids

Abstract.

Alternating Differential Scanning Calorimetric (ADSC) studies show that Se rich As20Se80-xAgx (0 ≤ x ≤ 15) glasses exhibit two endothermic glass transitions and two exothermic crystallization peaks; the observed thermal behavior has been understood on the basis that As20Se80-xAgx glasses are microscopically phase separated, containing Ag2Se phases embedded in an As-Se backbone. With increasing silver concentration, the Ag2Se phase percolates in the As-Se matrix, with a well-defined percolation threshold at x = 8. A signature of this percolation transition is shown up in the thermal behavior, as sudden jumps in the composition dependence of non-reversing enthalpy, ΔHnr obtained at the second glass transition reaction. Scanning Electron Microscopic (SEM) studies also confirm the microscopic phase separation in these glasses. The super-ionic conduction observed earlier in these glasses at higher silver proportions, is likely to be associated with the silver phase percolation.

PACS.

61.43.Fs Glasses 65.60.+a Thermal properties of amorphous solids and glasses: heat capacity, thermal expansion, etc. 

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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2008

Authors and Affiliations

  1. 1.Department of InstrumentationIndian Institute of ScienceBangaloreIndia

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