Plot of the imaginary part, in kΩ, of impedance versus its real part, in kΩ, for the paraelectric PbNb2O6 with rhombohedral phase, at temperatures (a) 400°C and 450°C (inset) (b) 560°C, 565°C, 580°C, and 590°C, and (c) 500°C, 550°C, 570°C, 600°C, 650°C, and 700°C (inset), since the complex impedance , quantity () has actually been plotted in the figure.
