Explanation

A physical phenomenon in which some substances can generate temporary voltage when temperature changes. materials with pyroelectric effect are called thermoelectric. The phenomenon of pyroelectricity was discovered by the ancient Greek philosopher Theophrastus as early as 314 BC. Sugebi scientist David Brewster gave this phenomenon its current name in 1824. The physical mechanism of the pyroelectric effect is as follows: the temperature change causes a slight change in the relative position of positive and negative ions in these materials. This leads to a change in the polarization state. The change of polarization state causes voltage on two polarization surfaces of materials. pyroelectric material must be polar crystalline materials. There is a spontaneous polarization direction.

Classification