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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 hematite stones. A nearly insulating synthetic hematite didn't generate audible vibrations. The semiconducting hematite stones from Brazil showed enhanced ferromagnetism. I tried to prepare this non-stoechiometric hematite by dissolving pure iron in acetic acid and heating the reaction product ferric-acetate. I succeeded in preparing a special iron oxide which looks like hematite but is semiconducting and ferromagnetic. This red powder shows strong electrostriction.
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