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Analogue and digital lock-in techniques are proposed for very-low-frequency impedance spectroscopy, versus f, involving modest instrumental effort, but achieving very high resolution, , in the frequency range Hz. Systematic errors are eliminated after careful network analysis. As an example, some data observed on the relaxor system (SCT) at low temperatures, , are presented. Its dielectric non-linearity and its transition into a frozen domain state at are briefly discussed.
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Albertini et al. (1997) studied this question.
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