Structure and Magnetic Properties of Bi5Ti3FeO15 Ceramics Prepared by Sintering, Mechanical Activation and Edamm Process. A Comparative Study

Three different methods were used to obtain Bi₅Ti₃FeO₁₅ ceramics, i.e. solid-state sintering, mechanical activation (MA) with subsequent thermal treatment, and electrical discharge assisted mechanical milling (EDAMM). The structure and magnetic properties of producedBi₅Ti₃FeO₁₅ samples were characterized using X-ray diffraction and Mössbauer spectroscopy. The purest Bi₅Ti₃FeO₁₅ ceramics was obtained by standard solid-state sintering method. Mechanical milling methods are attractive because the Bi₅Ti₃FeO₁₅ compound may be formed at lower temperature or without subsequent thermal treatment. In the case of EDAMM process also the time of processing is significantly shorter in comparison with solid-state sintering method. As revealed by Mössbauer spectroscopy, at room temperature theBi₅Ti₃FeO₁₅ ceramics produced by various methods is in paramagnetic state.