Abstract
Films of p-DiMethylAminoBenzaldehyde exhibit pyroelectricity in the temperature range 58° to 77°C and indicates the presence of a phase with spontaneous polarization. The origin of pyrocurrent can be attributed to the reorientation of two dipole groups CHO and (CH3)2N around the long molecular axis. The high value of pyroelectric coefficient 6.8×10-8 C/cm2/°C around 63°C showing a maxima, is thought to be due to the combined effect of the reorientation of these two dipole moments. The molecular contribution from the CHO group is expected to be larger here and has more temperature dependence.
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