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(a) Temperature dependence of at various frequencies, with a magnified view in the inset. The direction of the arrow shows increasing frequency. (b) Temperature coefficient of dielectric constant of at an applied frequency of 100 kHz. The inset to Fig. 2(b) shows the temperature dependence of the loss, , at an applied frequency of 100 kHz. (c) of measured as a function of frequency for various fixed temperatures. (d) Linear behavior of Polarization (P) of measured as a function of the applied electric field (E) with and 100 Hz (inset) at 300 K. Similar linearity is observed down to 15 K.
(a) Vibrational density of states of at point; dashed line separates soft modes (vibrational frequency ) from the rest. (b) Contribution of phonons to dielectric response of HCTO, averaged over , , and directions. The softest IR-active mode in HCTO contributes a small fraction of the total dielectric response.
Dielectric properties of the best known dielectric materials. The dielectric constant values, the values, and the temperature coefficients of dielectric constant measured at 300 K and at a frequency of around 100 kHz. The values given for the material, , are from the present measurements.
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