Temperature () dependence of the real part of the dielectric constant () during heating runs at various frequencies (5.5 MHz, 5 MHz, 4 MHz, 3 MHz, 2 MHz, 1 MHz, 500 kHz, 50 kHz, 30 kHz, 10 kHz, 5 kHz, and 1 kHz) for the rhombohedral phase of PbNb2O6. Inset enlarges 400°C to 700°C view of the versus graph. After 700°C cycling in Figure 4, presently observed low intensity peaks, marked in the present figure, got removed.
