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• W3104877345 abstract "We present a high sensitivity method allowing the measurement of the nonlinear dielectric susceptibility of an insulating material at finite frequency. It has been developed for the study of dynamic heterogeneities in supercooled liquids using dielectric spectroscopy at frequencies 0.05 Hz≤f≤3×104 Hz. It relies on the measurement of the third harmonics component of the current flowing out of a capacitor. We first show that standard laboratory electronics (amplifiers and voltage sources) nonlinearities lead to limits on the third harmonics measurements that preclude reaching the level needed by our physical goal, a ratio of the third harmonics to the fundamental signal about 10−7. We show that reaching such a sensitivity needs a method able to get rid of the nonlinear contributions both of the measuring device (lock-in amplifier) and of the excitation voltage source. A bridge using two sources fulfills only the first of these two requirements, but allows to measure the nonlinearities of the sources. Our final method is based on a bridge with two plane capacitors characterized by different dielectric layer thicknesses. It gets rid of the source and amplifier nonlinearities because in spite of a strong frequency dependence of the capacitor impedance, it is equilibrated at any frequency. We present the first measurements of the physical nonlinear response using our method. Two extensions of the method are suggested." @default.
• W3104877345 created "2020-11-23" @default.
• W3104877345 creator A5016813436 @default.
• W3104877345 creator A5022918056 @default.
• W3104877345 creator A5052389156 @default.
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• W3104877345 date "2008-10-01" @default.
• W3104877345 modified "2023-10-18" @default.
• W3104877345 title "A method for measuring the nonlinear response in dielectric spectroscopy through third harmonics detection" @default.
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• W3104877345 doi "https://doi.org/10.1063/1.2960564" @default.
• W3104877345 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19044727" @default.
• W3104877345 hasPublicationYear "2008" @default.
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