Structure and temperature dependence of conductivity of $Ag_{2.5}Se-Se$ composite

Vitta, Satish (1990) Structure and temperature dependence of conductivity of $Ag_{2.5}Se-Se$ composite. In: Journal of Applied Physics, 68 (7). pp. 3413-3417.

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Abstract

Rapid solidification of $Ag$-53 at. % Se alloy resulted in the formation of a composite mixture of $Ag_{2.5}Se$ and $Se$. The microstructure consists of spherical $Se$ grains of $2–20 \mu m$ size, randomly distributed in a matrix of $Ag_{2.5}Se$. The $Se$ grains were found to be layered hexagonal while the $Ag_{2.5}Se$ had an orthorhombic crystal structure. The unit cell size of this phase, however, was twice that reported for the equilibrium orthorhombic $Ag_2Se$ compound. The conductivity sigma variation with temperature in the range 80–320 K was found to be similar to that observed in degenerate semiconductors. The sigma decreased from $295 \Omega^{-1} cm^{-1}$ at room temperature to a saturation value of $70\Omega^{-1} cm^{-1}$ for temperatures <80 K. The results are discussed in terms of percolation conduction in the $Ag_{2.5}Se$ phase.

Item Type:	Journal Article
Publication:	Journal of Applied Physics
Publisher:	American Institute Of Physics
Additional Information:	Copyright of this article belongs to American Institute of Physics.
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	03 Jul 2007
Last Modified:	20 Jan 2012 06:15
URI:	http://eprints.iisc.ac.in/id/eprint/11384

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