أرسل هذا في رسالة قصيرة: Effect of magnesium niobate precursors on phase formation, microstructure and dielectric properties of perovskite lead magnesium niobate ceramics

 _____      ______    _____      ___     ______   
|  __ \\   /_   _//  /  ___||   / _ \\  |      \\ 
| |  \ ||   -| ||-  | // __    / //\ \\ |  --  // 
| |__/ ||   _| ||_  | \\_\ || |  ___  |||  --  \\ 
|_____//   /_____//  \____//  |_||  |_|||______// 
 -----`    `-----`    `---`   `-`   `-` `------`