أرسل هذا في رسالة قصيرة: Synthesis and Optical Band Gap Study of NIR-Reflective CoFe2O4 Black Pigments Doped with MgO, CaO and Al2O3

  _  __     ___      _____     _____     _____   
 | |/ //   / _ \\   / ____||  |  ___||  / ____|| 
 | ' //   | / \ || / //---`'  | ||__   / //---`' 
 | . \\   | \_/ || \ \\___    | ||__   \ \\___   
 |_|\_\\   \___//   \_____||  |_____||  \_____|| 
 `-` --`   `---`     `----`   `-----`    `----`