Abstract
A solid solution of FeTiO3 in host Bi0.5Na0.5TiO3 materials was fabricated by sol–gel method. The X-ray diffraction and Raman scattering analyses indicated that the Fe cations were randomly incorporated into the host lattice of Bi0.5Na0.5TiO3 materials, thereby resulting in the distortion of the crystal structural. The absorbance spectra of FeTiO3-modified Bi0.5Na0.5TiO3 samples revealed that the optical band gap decreased from 3.11 eV for pure Bi0.5Na0.5TiO3 materials to 2.41 eV with the addition of increasing amounts of FeTiO3 solid solution into the host Bi0.5Na0.5TiO3 materials (up to 9 mol% FeTiO3). The tunable magnetic properties of host Bi0.5Na0.5TiO3 materials were obtained as the concentration of FeTiO3 as solid solution was controlled. The weak ferromagnetism as compensation of diamagnetism of pure Bi0.5Na0.5TiO3 materials at room temperature was changed to ferromagnetism and end-off ferromagnetism combine with paramagnetism and/or antiferromagnetism with increasing FeTiO3 concentration during the formation of a solid solution. This work proposed an alternative method for obtaining ferromagnetism at room temperature for lead-free ferroelectric materials.
Published Version
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