Investigation of crystal structure and improved magnetic and dielectric properties of Ti-substituted Bi0.90Ho0.10FeO3 multiferroics

Bi-0.90Ho0.10Fe1-xTixO3 multiferroics (with x=0.00, 0.05, 0.10, and 0.15) were synthesized by method of solid state reaction. The XRD, SEM, dielectric properties, and magnetic measurements of the compounds were carried out. The X-ray patterns show structural change for x=0.15. Rietveld refinement of the XRD patterns deduces that the samples for x=0.00, 0.05, and 0.10 are found to fit well with rhombohedral R3c symmetry, while for x=0.15, sample accomplishes best fitting by the mixed-phase setting of rhombohedral R3c and triclinic P1 space group. The micro-Raman scattering observation also confirms the phase transformation. The change in crystal structure is attributed to the distortion of FeO6 octahedra due to replacing a part of B-site Fe ions by Ti ions. Magnetic measurements were performed at room temperature up to an external magnetic field of +/- 10kOe. Dielectric behaviour of all prepared ceramic samples was carried by impedance/gain phase analyser within the frequency range from 100Hz to 7MHz at different temperatures. It was observed that the Ti co-doping shows a significant role for the improving multiferroics properties.