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The dielectric constant of PbTiO 3 in both amorphous and crystalline states has been measured down to 18 mK at several frequencies in the range between 0.3 and 100 kHz. In each state, the dielectric constant around 100 mK has a frequency-dependent minimum, which is characteristic of vitreous state.
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Miura et al. (1983) studied this question.
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