Single phase synthesis, neutron diffraction and dielectric studies on 0.6PbFe_(0.5)Nb_(0.5)O_3-0.4BiFeO_3 multiferroic

摘要

0.6Pb(Fe_(0.5)Nb_(0.5))O_3-0.4BiFeO_3 (0.6PFN-0.4BFO) multiferroic solid solution was synthesized by single step solid state reaction method. The optimized synthesis parameters for 0.6PFN-0.4BFO multiferroic was calcination at 700°C/2 hr and sintering at 800°C/3 hr. Single phase was confirmed though room temperature X-ray Diffraction (XRD) and room temperature Neutron Diffraction (ND). XRD and ND data were well fitted with monoclinic structure with Cm space group. The magnetic structure was refined using the propagation vector k = (0.5, 0.5, 0.5) and the structure was found to be G-type antiferromagnetic. The dielectric constant and loss tangent of 0.6PFN-0.4BFO shows the frequency and temperature dependent nature. Loss tangent exhibits the thermally dependent relaxation peaks. 0.6PFN-0.4BFO is a potential candidate for above room temperature applications.