TY - JOUR
T1 - Multiferroic properties of nanostructured BiFeO3 tailored by milling and sintering by SPS
AU - Pedro-García, F.
AU - Sánchez-De Jesús, F.
AU - Cortés-Escobedo, C. A.
AU - Patiño-Pineda, J. A.
AU - Bolarín-Miró, A. M.
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/7/5
Y1 - 2019/7/5
N2 - We report the magnetic and dielectric behavior of multiferroic bismuth ferrites synthesized using milling-annealing processes and tailored through the crystallite size reduction and the microstrain generated by mechanical milling. For synthesis, stoichiometric mixtures of Bi2O3 and Fe2O3 were mixed and milled for 5 h using a ball to powder weight ratio of 10:1 by high-energy ball milling and annealed at 650 °C. Subsequently, was carried out the Crystallite Size Reduction by Milling-Process at different milling times, in a range of 0–60 min, using a ball to powder weight ratio of 50:1 adding 5% wt. of methanol. X-ray diffraction and Rietveld analysis were used to evaluate the crystallite size and microstrain of the crystal structure. Morphology was studied by scanning electron microscopy, and magnetic behavior was evaluated using vibrating sample magnetometry. The powders obtained from Crystal Size Reduction by Milling-Process were sintered using spark plasma sintering in a 10 mm diameter graphite die at 750 °C. The effect of spark plasma sintering was evaluated by X-ray diffraction, Rietveld analysis, vibrating sample magnetometry and broadband dielectric spectroscopy. The results show a transformation from BiFeO3 phase to Bi2Fe4O9 phase for longest Crystallite Size Reduction by Milling Process time. Relationships between microstructural transformation and oxidation-reduction reactions, as well as antiferromagnetic-ferromagnetic changes, are discussed. Dielectric properties were found to decrease with high Crystallite Size Reduction by Milling-Process. Also, an unusual ratio was observed in magnetodielectric coupling which increases with Crystallite Size Reduction by Milling-Process time.
AB - We report the magnetic and dielectric behavior of multiferroic bismuth ferrites synthesized using milling-annealing processes and tailored through the crystallite size reduction and the microstrain generated by mechanical milling. For synthesis, stoichiometric mixtures of Bi2O3 and Fe2O3 were mixed and milled for 5 h using a ball to powder weight ratio of 10:1 by high-energy ball milling and annealed at 650 °C. Subsequently, was carried out the Crystallite Size Reduction by Milling-Process at different milling times, in a range of 0–60 min, using a ball to powder weight ratio of 50:1 adding 5% wt. of methanol. X-ray diffraction and Rietveld analysis were used to evaluate the crystallite size and microstrain of the crystal structure. Morphology was studied by scanning electron microscopy, and magnetic behavior was evaluated using vibrating sample magnetometry. The powders obtained from Crystal Size Reduction by Milling-Process were sintered using spark plasma sintering in a 10 mm diameter graphite die at 750 °C. The effect of spark plasma sintering was evaluated by X-ray diffraction, Rietveld analysis, vibrating sample magnetometry and broadband dielectric spectroscopy. The results show a transformation from BiFeO3 phase to Bi2Fe4O9 phase for longest Crystallite Size Reduction by Milling Process time. Relationships between microstructural transformation and oxidation-reduction reactions, as well as antiferromagnetic-ferromagnetic changes, are discussed. Dielectric properties were found to decrease with high Crystallite Size Reduction by Milling-Process. Also, an unusual ratio was observed in magnetodielectric coupling which increases with Crystallite Size Reduction by Milling-Process time.
KW - BiFeO
KW - High-energy ball milling
KW - Mechanochemical processing
KW - Multiferroic BiFeO
KW - Reduced crystallite size
UR - http://www.scopus.com/inward/record.url?scp=85064084115&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2019.04.106
DO - 10.1016/j.jallcom.2019.04.106
M3 - Artículo
SN - 0925-8388
VL - 792
SP - 694
EP - 701
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -