Layer-structured, single phase Bi5Fe0.5Co0.5Ti3O15 ceramics was synthesized following a multicalcination procedure. Magnetic moment increases more than three times by substituting half Fe sites by Co ions. The material exhibits an Aurivillius phase with a four-layer unit cell structure, and presents a remarkable coexistence of ferroelectricity and ferromagnetism above room temperature. The measured 2P(r) and 2M(r) are 13 mu C/cm(2) and 7.8 memu/g, respectively. The material's magnetic behavior below 275 degrees C is relaxationlike and its magnetic Curie temperature is similar to 345 degrees C.

ceramics; Curie temperature; ferromagnetic materials; magnetic moments; multiferroics

Yangzhou University