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Answer for the clue "Generation of an electric charge on certain crystals (such as tourmaline) as a result of a change in temperature ", 15 letters:
pyroelectricity

Word definitions for pyroelectricity in dictionaries

WordNet Word definitions in WordNet
n. generation of an electric charge on certain crystals (such as tourmaline) as a result of a change in temperature

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Pyroelectricity \Pyr`o*e`lec*tric"i*ty\, n. (Physics) Electricity developed by means of heat; the science which treats of electricity thus developed.

Wiktionary Word definitions in Wiktionary
n. (context physics English) The generation of electric charge as a result of a change in temperature.

Wikipedia Word definitions in Wikipedia
Pyroelectricity (from the Greek pyr , fire, and electricity ) is 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 ...