Measurements of the relative complex dielectric constant of lead titanate powder to above 600°C and then back down in temperature, demonstrating hysteresis at the phase transition (Ref. 5) at 490°C.

Measurements of the relative complex dielectric constant of strontium carbonate powder to above 1000°C, demonstrating the phase transition (Ref. 5) at 928°C.

Measurements of the relative complex dielectric constant of potassium sulphate powder to above 700°C, demonstrating the phase transition (Ref. 5) at 582°C.