The electrical conductivity and pyroelectrical properties of ferric acetylacetone single crystal

The dielectric constant, the electrical conductivity and the pyroelectric behaviour of ferric acetylacetone Fe(ac.ac)3 single crystal have been measured as a function of temperature from 20 to 140 °C. The measurements along theb-axis show a peak value in the dielectric constant at 82 °C, while no peaks were recorded along the other axes. This anomaly is described as due to a phase transition. On repeating these measurements at high frequency (100 kHz), no abnormality was obtained. The electrical conductivity measurements show a discontinuity around the transition temperature at 82 °C. The spontaneous polarization of the crystal was measured along theb-axis at different temperatures. The curve shows a rapid decrease in the crystal polarization between 60 and 100 °C.