Magnetic and Magnetoelectric Properties of AurivilliusThree- and Four-Layered Intergrowth Ceramics

In this work, we have prepared intergrowth of multiferroic compounds namely Bi4RTi3Fe0.7Co0.3O15-Bi3RTi2Fe0.7Co0.3O12−δ (BRTFCO15-BRTFCO12) (rare earth (R) = Dy, Sm, La) by solid-state reaction method. From the X-ray diffraction Rietveld refinement, structure intergrowths was found to be orthorhombic in which satisfactory fittings establish existence three-layered (space group: b 2 c b) and four-layered A21am). Analysis magnetic measurements confirmed a larger magnetization for theSm-modified compound (BSTFCO15-BSTFCO12) compared Dy- La-doped ones. The emergence higher properties can due distortion unit cell when some Bi3+ ions are replaced with Sm3+, bonding Fe3+-O-Co3+ as well possible mixture FexCoy-type nanoparticles that formed generally synthesis intergrowths. changes state Aurivillius been reflected magnetoelectric (ME) coupling: ME coefficient (~30 mV/Cm-Oe) at lower fields is constant up 3 kOe. results were corroborated Raman spectroscopy variation temperature data. revealed RE-modified route an effective preparative method higher-layer ceramics.