Pyroelectric /(?)/

Pyr·o·e·lec·tric

Pyroelectric

a.
  1. Pertaining to, or dependent on, pyroelectricity; receiving electric polarity when heated. (Physics)

Pyroelectric

n.
  1. A substance which becomes electrically polar when heated, exhibiting opposite charges of statical electricity at two separate parts, especially the two extremities. (Physics)