On the case of the negative activation volumes of defects in solids

When conductivity, self-diffusion or electrical relaxation measurements are carried out at various pressures, the results are described in terms of a defect activation volume. Here, we discuss the rare case of negative activation volumes e.g., the one found by Fontanella et al. [Phys. Rev. Lett. 51...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2009-05, Vol.404 (8), p.1394-1397
Main Authors: Zardas, G.E., Symeonides, Ch.I.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Conductivity under pressure
Defect volume
Diffusion in solids
Electrical relaxation
Exact sciences and technology
Physics
Self-diffusion and ionic conduction in nonmetals
Theory of diffusion and ionic conduction in solids
Transport properties of condensed matter (nonelectronic)
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Summary:When conductivity, self-diffusion or electrical relaxation measurements are carried out at various pressures, the results are described in terms of a defect activation volume. Here, we discuss the rare case of negative activation volumes e.g., the one found by Fontanella et al. [Phys. Rev. Lett. 51 (1983) 1992] in the electrical relaxation measurements under pressure in β-PbF 2 doped with lanthanum and cerium. This might be of importance for the explanation of electric signals detected before earthquakes, We suggest that this might be due to a small Gruneisen constant γ i , namely smaller than 1 3 .
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2008.12.029