أرسل هذا في رسالة قصيرة: Synthesis, phase formation and characterization of Co<inf>4</inf>Nb <inf>2</inf>O<inf>9</inf> powders synthesized by solid-state reaction

 _    _      ___      ______    ______    _  _   
| || | ||   / _ \\   /_   _//  /_   _//  | \| || 
| || | ||  / //\ \\  `-| |,-    -| ||-   |  ' || 
| \\_/ || |  ___  ||   | ||     _| ||_   | .  || 
 \____//  |_||  |_||   |_||    /_____//  |_|\_|| 
  `---`   `-`   `-`    `-`'    `-----`   `-` -`