For the electrical measurements, sintered disc samples with a diameter of about 11 mm were ground to a 15 µm surface finish on both sides and subsequently annealed for 30 min at 800 °C with a heating rate of 5 °C/min and a cooling rate of 3 °C/min, to remove the residual stresses. Note that these conditions are not expected to result in CaTiO3 precipitation in quenched samples . 150 nm thick Ag electrodes were sputtered to cover the entire circular surfaces of the samples.