Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7887942 | Ceramics International | 2018 | 26 Pages |
Abstract
We report a study on the effect of the substitution of Bi3+ by Sr2+ on the stabilization of R3c structure of Bi1âxSrxFeO3 (0 ⤠x ⤠0.3, Îx = 0.05), and its effect in the magnetic and dielectric behavior. Stoichiometric mixtures of Bi2O3, Fe2O3 and SrO were mixed and milled for 5â¯h using a ball to powder weight ratio of 10:1 by high-energy ball milling. The obtained powder were pressed at 900â¯MPa to obtain cylindrical pellets and sintered at 800â¯Â°C for 2â¯h. X-ray diffraction and Rietveld refinement were used to evaluate the effect of Sr2+ on the crystal structure. In addition, vibrating sample magnetometry (VSM) and dielectric tests were used for describing the multiferroic behavior. The results show that Sr-doped BiFeO3 particles present rhombohedral structure (R3c) characteristic of α-BiFeO3 when the doping is below 0.10â¯mol of Sr. Additionally, a gradual decrease in the amount of secondary phases with the increase of the amount of strontium is observed. For doping concentration higher than 0.15â¯mol of Sr, a phase transition to an orthorhombic symmetry (β-BiFeO3, Pbnm) is detected. Besides, changes in relative intensities of reflection peaks planes (110) and (104) are associated with the phase transformations and with the magnetic and dielectric behavior. The α-BiFeO3 phase show antiferromagnetic behavior and high values of dielectric permittivity, whereas the β-BiFeO3 phase show a ferromagnetic behavior and low dielectric permittivity.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
F. Pedro-GarcÃa, A.M. BolarÃn-Miró, F. Sánchez-De Jesús, C.A. Cortés-Escobedo, Z. Valdez-Nava, G. Torres-Villaseñor,