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Search for a novel zero thermal expansion material: dilatometry of the AgI-CuI system

Kumar, Senthil P and Kini, NS and Umarji, AM and Sunandana, CS (2006) Search for a novel zero thermal expansion material: dilatometry of the AgI-CuI system. In: Journal Of Materials Science, 41 (12). pp. 3861-3865.

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Abstract

AgI is a well-known superionic conductor possessing a negative thermal expansion (NTE) coefficient while CuI is a p-type semiconductor possessing a positive thermal expansion coefficient. Pellets of X-Ray Diffraction (XRD) characterized compositions in the AgI-CuI system namely, beta AgI, gamma AgI, Ag0.5Cu0.5I, Ag0.25Cu0.75I, Ag0.10Cu0.90I, Ag0.05Cu0.95I and gamma CuI have been examined by quartz pushrod dilatometry measurements in order to look for a zero thermal expansion material. It is found that the systematic displacement of Ag by Cu gradually reduces the NTE anomaly in AgI. The composition Ag0.25Cu0.75I apparently exhibits near-zero thermal expansion. The results are discussed qualitatively in terms of relevant models.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Springer.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 08 Apr 2009 08:53
Last Modified: 19 Sep 2010 04:59
URI: http://eprints.iisc.ernet.in/id/eprint/17948

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