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Signature of a silver phase percolation threshold in microscopically phase separated ternary $Ge_0_._1_5Se_0_._8_5_-_xAg_x(0\not\leq x\not\leq 0.20)$ glasses

Pattanayak, Pulok and Asokan, S (2005) Signature of a silver phase percolation threshold in microscopically phase separated ternary $Ge_0_._1_5Se_0_._8_5_-_xAg_x(0\not\leq x\not\leq 0.20)$ glasses. In: Journal of Applied Physics, 97 . 013515/1-4.

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Abstract

Temperature modulated alternating differential scanning calorimetric studies show that Se rich $Ge_0_._1_5Se_0_._8_5_-_xAg_x(0\not\leq x\not\leq 0.20)$ glasses are microscopically phase separated, containing $Ag_2Se$ phases embedded in a $Ge_0_._1_5Se_0_._8_5$ backbone. With increasing silver concentration, $Ag_2Se$ phase percolates in the Ge–Se matrix, with a well-defined percolation threshold at x=0.10. A signature of this percolation transition is shown up in the thermal behavior, as the appearance of two exothermic crystallization peaks. Density, molar volume, and microhardness measurements, undertaken in the present study, also strongly support this view of percolation transition. The superionic conduction observed earlier in these glasses at higher silver proportions is likely to be connected with the silver phase percolation.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to American Institute of Physics (AIP).
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation and Applied Physics (Formally ISU)
Date Deposited: 08 Apr 2005
Last Modified: 19 Sep 2010 04:18
URI: http://eprints.iisc.ernet.in/id/eprint/3050

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