Figure 10: (a) Plot of versus 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 ( and °C) of the modified Curie-Weiss law from the 50 kHz plot of versus for the paraelectric phase of quenched PbNb2O6, which is orthorhombic.