Pyroelectric crystal | Wikipedia audio article
Channel: wikipedia tts
Date: 29/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Pyroelectricity


00:00:59 1 Explanation
00:04:03 1.1 Mathematical description
00:04:50 2 History
00:06:28 3 Crystal classes
00:08:34 3.1 Related effects
00:11:21 4 Pyroelectric materials
00:12:31 5 Applications
00:12:41 5.1 Heat sensors
00:13:07 5.2 Power generation
00:14:17 5.3 Nuclear Fusion
00:14:40 6 See also



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SUMMARY
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Pyroelectricity (from the two Greek words pyr meaning fire, and electricity) is a property of certain crystals which are naturally electrically polarized and as a result contain large electric fields. Pyroelectricity can be described as the 
ability of certain materials to generate a temporary voltage when they are heated or cooled. The change in temperature modifies the positions of the atoms slightly within the crystal structure, such that the polarization of the material changes. This polarization change gives rise to a voltage across the crystal. If the temperature stays constant at its new value, the pyroelectric voltage gradually disappears due to leakage current. (The leakage can be due to electrons moving through the crystal, ions moving through the air, or current leaking through a voltmeter attached across the crystal.)