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 |
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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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