Pyroelectricity

Japanese: 焦電気 - しょうでんき

Also known as pyroelectricity or pyroelectricity. The phenomenon in which a crystal becomes electrically charged when part of it is heated. This phenomenon is particularly prevalent in tourmaline, from which the name is derived. It is said to have been discovered by FUT Epinus in 1756, but it is also said to have been discovered earlier. If you sprinkle powdered red lead and sulfur on a heated crystal while it is cooling, the red lead will gather in the negatively charged parts and the sulfur will gather in the positively charged parts, which can be observed.

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

パイロ電気，ピロ電気とも。結晶体の一部を熱すると電気を帯びる現象。電気石に顕著で名の由来となっている。1756年F.U.T.エピヌスが発見したとされるが，それ以前に発見されていたともいわれる。熱した結晶を冷やしながら鉛丹と硫黄の粉末をふりかけると，鉛丹は負，硫黄は正に帯電した部分に集まるので観察できる。

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