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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 permittivityɛ r (formerly called dielectric constant) upon introduction of an ion of charge numberz and radius r:
Δ V el = − ( z e ) 2 2 r ɛ r ∂ ( ln ɛ r ) ∂ p
with e the elementary charge.
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.
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: (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
Last update: 2014-02-24; version: 2.3.3.
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