Abstract
AbstractThe electric conductivity and the optical absorption of PbTiO3 crystals are explained by the existence of Pb3+ ions and free holes as electronic defects and of O– vacancies and interstitials as ionic anti‐Frenkel defects. The absorption band at 475 nm is caused by Pb3+ ions and produces the yellowish or brownish colour of the crystals. Using fluoridic fluxes instead of oxidic fluxes for the crystals growth a small part of O– ions is replaced by F− foreign ions. This substitution diminishes the Pb3+ ion content and causes an increased optical transmission of the PbTiO3 crystals.
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