Defect chemistry may be the analyze of point defects in imperfect crystals. These consist of vacancies, interstitial atoms or ions, trace factors, electrons, or holes or every other deviation from the structure of a great crystal. Even Definitely pure crystals have level defects at any temperature higher than complete zero. https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share