Electrostriction of hematite

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Description: An alternating current in the audible range through hematite stones with different electric conductivity generated audible vibrations of the hematite

License: GNU General Public License (GPL) 3.0

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Hematite is an insulator. But it can be a semiconductor too. It depends of crystal defects like oxygen vacancies and others. I tested hematite with different electric conductivity. For this I used a pulse generator with a pulsating voltage of 50 Volt. After connecting the stones with the output of this pulse generator audible sound could be heard caused by vibrations of the semiconducting hematit...

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