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Drude–Nernst equation (for electrostriction)

Equation describing the contraction (Δ V el) taking place in a dielectric medium of relative static permittivity ɛ r (formerly called dielectric constant) upon introduction of an ion of charge number z and radius r:
Δ V el = − ( z e ) 2 2 r ɛ r ∂ ( ln ɛ r ) ∂ p
with e the elementary charge.
Note:
Inasmuch as the derivative of ln ɛ r with respect to pressure, ∂ ( ln ɛ r ) ∂ p, is not known for all media, there are approximations to evaluate this term as a function of ɛ r and of the isothermal compressibility of the medium, κ T.
Source:
PAC, 2007, 79, 293 (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 327
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi:10.1351/goldbook.DT07364.
Original PDF version: http://www.iupac.org/goldbook/DT07364.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.
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