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Rapid Microwave Preparation and Composition Tuning of the High-Performance Magnetocalorics (Mn,Fe)2(P,Si).
Grebenkemper, Jason H; Bocarsly, Joshua D; Levin, Emily E; Seward, Gareth; Heikes, Colin; Brown, Craig; Misra, Sumohan; Seeler, Fabian; Schierle-Arndt, Kerstin; Wilson, Stephen D; Seshadri, Ram.
Afiliação
  • Heikes C; Center for Neutron Research, National Institute of Standards and Technology , Gaithersburg, Maryland 20899, United States.
  • Brown C; Center for Neutron Research, National Institute of Standards and Technology , Gaithersburg, Maryland 20899, United States.
  • Misra S; BASF SE , 67056 Ludwigshafen, Germany.
  • Seeler F; BASF SE , 67056 Ludwigshafen, Germany.
  • Schierle-Arndt K; BASF SE , 67056 Ludwigshafen, Germany.
ACS Appl Mater Interfaces ; 10(8): 7208-7213, 2018 Feb 28.
Artigo em Inglês | MEDLINE | ID: mdl-29457889
ABSTRACT
Rapid preparation utilizing assisted microwave heating permits significantly shorter preparation times for magnetocaloric compounds in the (Mn,Fe)2(P,Si) family, specifically samples of (Mn,Fe)2-δP0.5Si0.5 with starting compositions of δ = 0, 0.06, and 0.12. To fully understand the effects of processing and composition changes on structure and properties, these materials are characterized using synchrotron powder diffraction, neutron powder diffraction, electron microprobe analysis (EMPA), X-ray fluorescence (XRF), and magnetic measurements. The diffraction analysis reveals that increasing δ results in decreasing amounts of the common Heusler (Mn,Fe)3Si secondary phase. EMPA shows (Mn,Fe)2(P,Si) in all three samples to be Mn and P rich, whereas XRF demonstrates that the bulk material is Mn rich yet P deficient. Increasing δ brings the Mn/Fe and P/Si ratios closer to their starting values. Measurements of magnetic properties show an increase in saturation magnetization and ordering temperature with increasing δ, consistent with the increase in Fe and Si contents. Increasing δ also results in a decrease in thermal hysteresis and an increase in magnetic entropy change, the latter reaching values close to what have been previously reported on samples that take much longer to prepare.

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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: ACS Appl Mater Interfaces Assunto da revista: Biotecnologia / Engenharia Biomédica Ano de publicação: 2018 Tipo de documento: Artigo