Structure and hyperfine interactions in multiferroic Aurivillius Bi m+1Ti3Fe O-m-3(3m+3) compounds prepared by mechanical activation

Abstract

The aim of the study was to determine the structure and hyperfine interactions of Bim+1Ti3Fem􀀀3O3m+3 multiferroic Aurivillius compounds prepared by mechanical activation process. X-ray diffraction and Mössbauer spectroscopy were applied as complementary methods. After the process of mechanical milling, desired Aurivillius phases were not formed, thus, thermal treatment needed to be applied. Heating the product of mechanical activation up to 993 K allowed to obtain Aurivillius phases with relatively large amount of non-reacted hematite. However, after the material was annealed at an elevated temperature of 1073 K, the content of not fully synthesized hematite was significantly reduced. Mössbauer spectroscopy confirmed that Aurivillius compounds remain in paramagnetic state at room temperature.