Abstract
A unified classification (considered within the Langevin phenomenology) is proposed on the basis of comparing the spectral features of complex permittivity ɛ*, specific conductivity σ*, and noises. This classification is generalized to fractal systems, and a description of flicker noise is proposed. The experimental data on flicker noise in the dipole glass phase of lead zirconate titanate with sodium and bismuth impurities (PZTNB-1) in piezoelectric ceramics are reported.
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