Stabilization of α-BiFeO3 structure by Sr2+ and its effect on multiferroic properties
| Autor: | Zarel Valdez-Nava, Ana María Bolarín-Miró, F. Sánchez-De Jesús, G. Torres-Villaseñor, F. Pedro-García, C.A. Cortés-Escobedo |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Phase transition Materials science Rietveld refinement Process Chemistry and Technology Analytical chemistry 02 engineering and technology Dielectric Crystal structure 021001 nanoscience & nanotechnology 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ferromagnetism 0103 physical sciences Materials Chemistry Ceramics and Composites Antiferromagnetism Multiferroics 0210 nano-technology Ball mill |
| Zdroj: | Ceramics International. 44:8087-8093 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2018.01.251 |
| Popis: | We report a study on the effect of the substitution of Bi3+ by Sr2+ on the stabilization of R3c structure of Bi1−xSrxFeO3 (0 ≤ x ≤ 0.3, Δx = 0.05), and its effect in the magnetic and dielectric behavior. Stoichiometric mixtures of Bi2O3, Fe2O3 and SrO were mixed and milled for 5 h using a ball to powder weight ratio of 10:1 by high-energy ball milling. The obtained powder were pressed at 900 MPa to obtain cylindrical pellets and sintered at 800 °C for 2 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 0.10 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 0.15 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. |
| Databáze: | OpenAIRE |
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