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APS » Journals » Phys. Rev. Lett. » Volume 98 » Issue 19
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Phys. Rev. Lett. 98, 195501 (2007) [4 pages]

Fast-Ion Conduction and Flexibility of Glassy Networks

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Deassy I. Novita and P. Boolchand
Department of Electrical and Computer Engineering, University of Cincinnati, Cincinnati, Ohio 45221-0030, USA

M. Malki
Centre de Recherche sur les Matériaux à Haute Température, CNRS, 1D Avenue de la Recherche Scientifique, 45071 Orléans, and Polytech’Orléans, Université d’Orléans, 8, rue Léonard de Vinci, 45072 Orléans, France

M. Micoulaut
Laboratoire de Physique Théorique de la Matière Condensée, Université Pierre et Marie Curie, Boite 121, 4, Place Jussieu, 75252 Paris, Cedex05, France

Received 20 December 2006; published 8 May 2007

We observe two thresholds in the variations of electrical conductivity of dry (AgI)x(AgPO3)1-x solid electrolyte glasses, when the AgI additive concentration x increases to 9.5% and to 37.8%. Raman scattering complemented by calorimetric measurements confirms that these thresholds are signatures of the rigidity phase transitions at x=9.5% from a stressed rigid to an isostatically (stress-free) rigid phase, and at x=37.8% from isostatically rigid to a flexible phase. In the flexible phase, the electrical conductivity seems to increase as a power of x. This is in good agreement with the theoretical prediction based on 3D percolation.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.195501
DOI:
10.1103/PhysRevLett.98.195501
PACS:
61.43.Fs
 
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