Dielectric Properties of PbNb₂O₆ up to 700°C from Impedance Spectroscopy

Figure 10

(a) Plot of ln(1/𝜀^′−1/𝜀^′_max) versus ln(𝑇−𝑇_𝑚) for quenched PNO sample, the orthorhombic phase of PbNb₂O₆, at various frequencies (3 MHz, 2 MHz, 1 MHz, 50 kHz, and 1 kHz). It examines the relationship, expected for the paraelectric phase of a normal ferroelectric. (b) A specific example of finding the parameters (𝛾=1.0346 and 𝐶=123569.04°C) of the modified Curie-Weiss law from the 50 kHz plot of ln(1/𝜀^′−1/𝜀^′_max) versus ln(𝑇−𝑇_𝑚) for the paraelectric phase of quenched PbNb₂O₆, which is orthorhombic.

(a)

(b)