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

Pulok Pattanayak and S. Asokan ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2008, vol. 62, issue 3, 277-280

Abstract: Alternating Differential Scanning Calorimetric (ADSC) studies show that Se rich As 20 Se 80-x Ag x (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 As 20 Se 80-x Ag x glasses are microscopically phase separated, containing Ag 2 Se phases embedded in an As-Se backbone. With increasing silver concentration, the Ag 2 Se 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, ΔH nr 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. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2008

Keywords: 61.43.Fs Glasses; 65.60.+a Thermal properties of amorphous solids and glasses: heat capacity; thermal expansion; etc. (search for similar items in EconPapers)
Date: 2008
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DOI: 10.1140/epjb/e2008-00171-4

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