أرسل هذا في رسالة قصيرة: Characterization of lead-free bismuth titanate (Bi<inf>4</inf>Ti <inf>3</inf>O<inf>12</inf>) synthesized by a modified oxalate co-precipitation method

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