Refinements in the dc transient current method are described for precision measurements of dielectric permittivity from 50 mHz down to 1 μHz. Relaxation increment, relaxation time, and distribution of the relaxation times for a test sample of poly(vinyl acetate) have been measured with satisfactory accuracy as judged by comparison with results from steady-state measurements. Convenient procedures for numerical Fourier transformation of the observed current are described to easily obtain the complex permittivity.
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Takeishi et al. (1982) studied this question.
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