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Gil-González, E.

Manchón-Gordón, Alejandro F.

Perejón, Antonio

Pérez-Maqueda, Luis A.

Sánchez-Jiménez, Pedro E.

English

Engineering Conferences International

A COMPARATIVE STUDY OF MAGNETIC AND ELECTRICAL PROPERTIES OF BiFeO3 MUTIFERROIC CERAMICS SINTERED BY ELECTRIC FIELD ASSISTED-METHODS: SPARK PLASMA SINTERING AND FLASH SINTERING  Alejandro F. Manchón-Gordón, ICMSE CSIC-Universidad de Sevilla, Spain Antonio Perejón, ICMSE CSIC-Universidad de Sevilla; Universidad de Sevilla, Spain E. Gil-González, ICMSE CSIC-Universidad de Sevilla, Spain Pedro E. Sánchez-Jiménez, ICMSE CSIC-Universidad de Sevilla; Universidad de Sevilla, Spain Luis A. Pérez-Maqueda, ICMSE CSIC-Universidad de Sevilla, Spain   Key Words: Flash sintering, spark plasma sintering, bismuth ferrite, magnetic properties, electrical properties  Multiferroics are one class of unique functional materials that exhibit two or more ferroic orders, such as ferroelectricity, ferromagnetism and ferroelasticity. This class of materials have attracted considerable interest owing to the coexistence of at least two switchable states, which promises a wide range of applications in multifunctional devices. Despite being one of the most studied multiferroic ceramics, bismuth iron oxide, BiFeO3, still attracts much attention from scientist worldwide due to its unique properties of co-existence of ferroelectricity and ferromagnetism [1]. In fact, in its bulk form, BiFeO3 is a ferroelectric material with a theoretical saturated polarization as large as 90 𝜇𝜇C/cm2 and a relatively high Curie temperature 𝑇𝑇𝐶𝐶~1100 K [2].  In this work, we present the influence of the sintering process on the magnetic and the electrical properties of bulk BiFeO3 prepared by mechanosynthesis and sintered by two field-assisted sintering techniques, FAST: spark plasma sintering and flash sintering. Magnetic measurements proved that a decrease in the particle size causes the appearance of a ferromagnetic hysteresis loop at 300 K and a significant enhancement of the magnetic parameters when the samples are compared with those of a BiFeO3 specimen prepared by conventional methods. Magnetization curves of the specimens densified by FAST methodologies exhibit a phase transition around 250 K, which has not been previously detected in bulk BiFeO3 systems by magnetometry measurements. The electrical properties were measured by impedance spectroscopy. The conductivity of the flash sintering specimens was nearly one order of magnitude lower than samples prepared by SPS [3].   REFERENCES [1] J. Wu, Z. Fan, D. Xiao, J. Zhu, J. Wang, Multiferroic bismuth ferrite-based materials for multifunctional applications: Ceramic bulks, thin films and nanostructures, Progress in Materials Science 84 (2016) 335-402. [2] F. Kubel, H. Schmid, Structure of a ferroelectric and ferroelastic monodomain crystal of the perovskite BiFeO3, Acta Crystallographica Section B 46(6) (1990) 698-702. [3] L.A. Perez-Maqueda, E. Gil-Gonzalez, A. Perejon, J.M. Lebrun, P.E. Sanchez-Jimenez, R. Raj, Flash sintering of highly insulating nanostructured phase pure BiFeO3, Journal of the American Ceramic Society 100(8) (2017) 3365-3369.    

A comparative study of magnetic and electrical properties of BiFeO3 mutiferroic ceramics sintered by electric field assisted-methods: Spark plasma sintering and flash sintering

https://dc.engconfintl.org/cgi/viewcontent.cgi?filename=0&article=1057&context=efe_advancedmaterials_iii&type=additional

A comparative study of magnetic and electrical properties of BiFeO3 mutiferroic ceramics sintered by electric field assisted-methods: Spark plasma sintering and flash sintering

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