Defect chemistry could be the review of stage defects in imperfect crystals. These incorporate vacancies, interstitial atoms or ions, trace aspects, electrons, or holes or any other deviation from the construction of a perfect crystal. Even Totally pure crystals have level defects at any temperature over absolute zero. Wonderful piece https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share