First observed (1824) in quartz, pyroelectricity is exhibited only in crystallized nonconducting substances having at least one axis of symmetry that is polar (that is, having no centre of symmetry, the different crystal faces occurring on opposite ends).

What crystals are pyroelectric?

A large number of pyroelectric materials exist, including minerals such as tourmaline, single crystals such as triglycine sulfate, ceramics such as lead zirconate titanate, polymers such as polyvinylidene fluoride, and even biological materials, such as collagen.

What is a pyroelectric material?

Pyroelectricity or pyroelectric material is an electric response of polar dielectric with a change in temperature. … The pyroelectric voltage becomes zero due to the leakage current. So, within this same temperature limits, the charges developed by the effect of heating or cooling are equal and opposite.