Dielectric and optical properties of ferroelectric dicalcium lead propionate

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Abstract
Temperature dependence of spontaneous polarization, dielectric constant, optical rotatory power and birefringence of ferroelectric Ca2Pb(C2H5CO2)6 have been measured in a wide temperature region including the I-II phase transition point. It was found that, in as-grown crystals, an internal biasing field of 20 ∼ 30 kV/cm exists and this can be removed by annealing crystals at 250°C for 12 hours. Effects of annealing on dielectric and optical properties were also investigated. Below about 0°C, the spontaneous polarization decreased with decreasing temperature in contrast to that of the isomorphous ferroelectric Ca2Sr(C2H5CO2)6. Except for this point, temperature dependence of the other quantities are very similar to those of Ca2Sr(C2H5CO2)6.