Electrical and magnetic properties of nanostructured (Bi0,85La0,15)FeO3 powders and ceramics

Reference	Presenter	Authors (Institution)	Abstract
08-009	Roger Carvalho Oliveira	Oliveira, R.C.(Universidade Estadua de Maringá); Eiras, J.A.(Universidade Federal de São Carlos); Garcia, D.(Universidade Federal de São Carlos); SANTOS, I.A.(Universidade Estadua de Maringá); Dias, G.S.(Universidade Estadua de Maringá); Volnistem, E.A.(Universidade Estadua de Maringá); Cótica, L.F.(Universidade Estadua de Maringá);	BiFeO3 (BFO) is a multiferroic magnetoelectric material with a rhomboedrally distorted perovskite structure (R3c space group), presenting ferroelectric and antiferromagnetic (G-type) orders at room temperature. When specially doped with rare earths, BFO ceramics can show high densification ratios and small-size (nanoscale) grains. In this contribution, single phase (Bi0,85La0,15)FeO3 powders and ceramics were synthesized by using a combination of high-energy ball milling, fast firing and quenching to room temperature protocols. Besides that, to decrease the mean particles size and reach the nanoscale, cryomilling (using a home-built setup for cryomill - low temperature high-energy ball milling process) was also used. The Spark-Plasma Sintering (SPS) technique was used focusing to achieve nanostructured monolithic samples. A series of experimental techniques was used to determine structural, microstructural, dielectric and magnetic properties of the processed powders and ceramics. X-ray diffraction results showed single-phased samples (R3c space group), while scanning electron microscopy analyzes confirmed that the obtained particles were indeed in nanoscale. Direct current electric conductivity, at room temperature, and dielectric measurement results, as a function of temperature and frequency, were also obtained and discussed.
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