Dielectric properties of PbWO₄, PbMgWO₄ and PbCaWO₄ compounds

PbWO₄, PbMgWO₄ and PbCaWO₄ have been synthesised by the solid solution route technique. XRD patterns show them to be tetragonal. Dielectric constant (K´) and Dielectric loss (K´´) of PbWO₄, PbMgWO₄ and PbCaWO₄ have been measured at 1 kHz in the temperature range of 300 K to 1050 K. The log K´ vs T as well as log K´´ vs T plot of PbWO₄, PbMgWO₄ and PbCaWO₄ shows rapid increase of dielectric constant above 640 K, 700 K and 650 K respectively.