Adding a Schottky junction to certain crystals can turn them into piezoelectric or pyroelectric crystals, even if they were unaffected by deformation or heat before, according to the the University of Warwick, where the research was done. The subjects were ‘centrosymmetric’ semiconductors. niobium-doped strontium titanium oxide crystals niobium-doped titanium dioxide crystals niobium-doped barium strontium titanium ...
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