Ivair Santos - Academia.edu (original) (raw)
I have completed my BS in Physics (1994) at the State University of Maringá, MSc. in Physics (1997) at the Campinas State University and Ph.D. in Physics (2001) at the Federal University of São Carlos. I'm currently Associate Professor of the Department of Physics, State University of Maringá, and permanent member of the Graduate Program in Physics and Mechanical Engineering at that institution. I have published over 100 papers in indexed scientific journals and over one hundred communications in scientific meetings. I also have advised more than a dozen undergraduate and graduate (MSc. and PhD.) students in the last five years. Currently I coordinate 5 research projects supported by governamental brazilian research agencies (CNPq, CAPES and Fundação Araucária de Apoio ao Desenvolvimento Científico e Tecnológico do Parana), everyone in the area of Condensed Matter Physics. These projects aim to study and development of nanomaterials, especially multiferroic magnetoelectrics, and multifunctional devices. My interests are focused on the study of the structure/properties in multiferroic magnetoelectrics, with special emphasis on the study of magnetoelectric coupling in polycrystals, and the development of solid state transformers, actuators and sensors.
less
Related Authors
Hwa Hsia Institute of Technology
Uploads
Papers by Ivair Santos
Journal of the Brazilian Chemical Society, 2008
Este trabalho descreve a síntese e a caracterização de BiFeO 3 obtido a partir da rota Pechini, u... more Este trabalho descreve a síntese e a caracterização de BiFeO 3 obtido a partir da rota Pechini, utilizando-se nitrato de bismuto e nitrato de ferro como precursores. Os pós foram calcinados a 800 °C em ar durante 2 h. Os difratogramas de raios X mostraram que o material apresenta duas fases, BiFeO 3 (95%) e α-Bi 2 O 3 (5%). A transição de fase ferroelétrica da amostra em 821 °C foi detectada por análise térmica diferencial. Os resultados das análises por microscopia eletrônica de varredura (SEM), espectroscopia de energia dispersiva (EDS) e fluorescência de raios X por dispersão de energia (EDX) mostraram que a amostra é quimicamente homogênea. As imagens de microscopia eletrônica de transmissão revelaram que a amostra é uniforme e apresenta partículas com formato esférico e tamanho médio de 30 nm.
In this manuscript, X-ray and high-resolution neutron powder diffraction investigations, associat... more In this manuscript, X-ray and high-resolution neutron powder diffraction investigations, associated with Rietveld refinements, magnetic hysteresis curves and a modeling of electron-density distributions around the ions, are used to describe the driving forces responsible for tuning the ferroic states in La doped (0.6)BiFeO 3 -(0.4)PbTiO 3 compositions. The intrinsic relations between the ferroic orders and the structural arrangements (angles, distances and electron-density distributions around the ions) are revealed, helping in the understanding of some aspects comprising the ferroic properties of perovskite-based displacive multiferroic compounds.
Journal of the Brazilian Chemical Society, 2008
Este trabalho descreve a síntese e a caracterização de BiFeO 3 obtido a partir da rota Pechini, u... more Este trabalho descreve a síntese e a caracterização de BiFeO 3 obtido a partir da rota Pechini, utilizando-se nitrato de bismuto e nitrato de ferro como precursores. Os pós foram calcinados a 800 °C em ar durante 2 h. Os difratogramas de raios X mostraram que o material apresenta duas fases, BiFeO 3 (95%) e α-Bi 2 O 3 (5%). A transição de fase ferroelétrica da amostra em 821 °C foi detectada por análise térmica diferencial. Os resultados das análises por microscopia eletrônica de varredura (SEM), espectroscopia de energia dispersiva (EDS) e fluorescência de raios X por dispersão de energia (EDX) mostraram que a amostra é quimicamente homogênea. As imagens de microscopia eletrônica de transmissão revelaram que a amostra é uniforme e apresenta partículas com formato esférico e tamanho médio de 30 nm.
In this manuscript, X-ray and high-resolution neutron powder diffraction investigations, associat... more In this manuscript, X-ray and high-resolution neutron powder diffraction investigations, associated with Rietveld refinements, magnetic hysteresis curves and a modeling of electron-density distributions around the ions, are used to describe the driving forces responsible for tuning the ferroic states in La doped (0.6)BiFeO 3 -(0.4)PbTiO 3 compositions. The intrinsic relations between the ferroic orders and the structural arrangements (angles, distances and electron-density distributions around the ions) are revealed, helping in the understanding of some aspects comprising the ferroic properties of perovskite-based displacive multiferroic compounds.