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Structure and temperature dependence of conductivity of Ag2.5Se‐Se composite

Vitta, Satish (1990) Structure and temperature dependence of conductivity of Ag2.5Se‐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 Ag2.5Se and Se. The microstructure consists of spherical Se grains of 2–20 μm size, randomly distributed in a matrix of Ag2.5 Se. The Se grains were found to be layered hexagonal while the Ag2.5 Se had an orthorhombic crystal structure. The unit cell size of this phase, however, was twice that reported for the equilibrium orthorhombic Ag2 Se compound. The conductivity σ variation with temperature in the range 80–320 K was found to be similar to that observed in degenerate semiconductors. The σ decreased from 295 Ω−1 cm−1 at room temperature to a saturation value of 70 Ω−1 cm−1 for temperatures <80 K. The results are discussed in terms of percolation conduction in the Ag2.5 Se phase.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Institute of Physics.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Depositing User: Ms V Mangala
Date Deposited: 27 Feb 2012 11:05
Last Modified: 27 Feb 2012 11:05
URI: http://eprints.iisc.ac.in/id/eprint/43024

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