التفاصيل البيبلوغرافية
| العنوان: |
Magnetoelectric coupling in multiferroic BiFeO3 by co-doping with strontium and nickel. |
| المؤلفون: |
Pedro-García, F.1 (AUTHOR), Betancourt-Cantera, L.G.1 (AUTHOR), Bolarín-Miró, A.M.1 (AUTHOR), Cortés-Escobedo, C.A.2 (AUTHOR), Barba-Pingarrón, A.3 (AUTHOR), Sánchez-De Jesús, F.1 (AUTHOR) fsanchez@uaeh.edu.mx |
| المصدر: |
Ceramics International. Jun2019, Vol. 45 Issue 8, p10114-10119. 6p. |
| مصطلحات موضوعية: |
*STRONTIUM, *PERMITTIVITY, *CRYSTAL structure, *MAGNETIC moments, *NICKEL, *IRON alloys, *RIETVELD refinement |
| مستخلص: |
Abstract We report the effects of the Sr2+ and Ni2+ co-doping of BiFeO 3 on the crystal structure and multiferroic properties of Bi 1−x Sr x Fe 1-y Ni y O 3 (x = 0.05, 0.0 ≤ y ≤ 0.10, and Δy = 0.05) that is synthesized using assisted high-energy ball milling. The mixtures of Bi 2 O 3 , Fe 2 O 3 , SrO and NiO were milled for 5 h, pressed at 900 MPa, and sintered at 800 °C in order to obtain cylindrical test pieces. X-ray diffraction and Rietveld refinement elucidated the effects of Sr2+ and Ni2+ on the crystal structure. Co-doping with Sr Ni in suitable proportions stabilizes rhombohedral BiFeO 3. High contents of Ni2+ promote the precipitation of secondary phases in the forms of NiFe 2 O 4 and Bi 25 FeO 40. The magnetic behavior was examined by means of vibrating sample magnetometry. The results showed a change in the magnetic order from antiferromagnetic for the undoped sample to the ferromagnetic order for the co-doped samples. This change is attributed to the modulations in the magnetic moment due to crystal structure distortions. All samples show high relative permittivity values, which were enhanced by doping with Sr2+. Ni2+ cations increase the dielectric dissipation factor; this enhancement is related to their interactions with cations of a different oxidation state, such as Fe3+, Fe2+, Ni2+, Bi3+ and Sr2+ in the crystal structure of BiFeO 3. The magnetoelectric coupling that was evaluated using magnetodielectric measurements was above 4% at 1 kHz for the higher applied magnetic field of 18 kOe. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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