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題名 Magnetism in nanoparticles of semiconducting FeSi2
作者 Hamdeh, H.H.;Eltabey, M.M.;Ho, J.C.;Lee, P.C.;Chen, K.;Chen, Yang-Yuan
陳洋元
貢獻者 應物所
關鍵詞 Chemical disorder; Compositional heterogeneity; Fe-ions; Iron disilicide; Low temperatures; Magnetic ordering; Magnetic orders; Magnetic studies; Quadrupoles; Shift parameters; Sommerfeld constant; XRD; Calorimetry; Iron compounds; Molybdenum; Nanoparticles; Specific heat; Spin glass; Superparamagnetism; Nanomagnetics
日期 2010-08
上傳時間 29-Jun-2015 17:21:41 (UTC+8)
摘要 Iron disilicide has been found to exhibit superparamagnetism in nanoparticles, even though no magnetic ordering occurs in bulk. The unexpected behavior was attributed, based on magnetic studies, to chemical disorder. A lack of sextet-type signals in Mössbauer spectra supports that the observed magnetic order is confined to only a very small fraction of magnetic Fe ions. Moreover, quadrupole-splitting and isomer-shift parameters reveal a significant amount of Fe in a short-range α-FeSi2 structure, while XRD suggests an overall β-FeSi2 structure. Such a compositional heterogeneity is also reflected in a calorimetrically obtained spin-glass-like anomaly at low temperatures. Meanwhile, as the particle size decreases, specific heat and Sommerfeld constant are enhanced due to lattice softening and the emergence of surface charge density of states, respectively, in nanoparticles. © 2010 Elsevier B.V. All rights reserved.
關聯 Journal of Magnetism and Magnetic Materials, 322(15), 2227-2230
資料類型 article
DOI http://dx.doi.org/10.1016/j.jmmm.2010.02.015
dc.contributor 應物所
dc.creator (作者) Hamdeh, H.H.;Eltabey, M.M.;Ho, J.C.;Lee, P.C.;Chen, K.;Chen, Yang-Yuan
dc.creator (作者) 陳洋元zh_TW
dc.date (日期) 2010-08
dc.date.accessioned 29-Jun-2015 17:21:41 (UTC+8)-
dc.date.available 29-Jun-2015 17:21:41 (UTC+8)-
dc.date.issued (上傳時間) 29-Jun-2015 17:21:41 (UTC+8)-
dc.identifier.uri (URI) http://nccur.lib.nccu.edu.tw/handle/140.119/76101-
dc.description.abstract (摘要) Iron disilicide has been found to exhibit superparamagnetism in nanoparticles, even though no magnetic ordering occurs in bulk. The unexpected behavior was attributed, based on magnetic studies, to chemical disorder. A lack of sextet-type signals in Mössbauer spectra supports that the observed magnetic order is confined to only a very small fraction of magnetic Fe ions. Moreover, quadrupole-splitting and isomer-shift parameters reveal a significant amount of Fe in a short-range α-FeSi2 structure, while XRD suggests an overall β-FeSi2 structure. Such a compositional heterogeneity is also reflected in a calorimetrically obtained spin-glass-like anomaly at low temperatures. Meanwhile, as the particle size decreases, specific heat and Sommerfeld constant are enhanced due to lattice softening and the emergence of surface charge density of states, respectively, in nanoparticles. © 2010 Elsevier B.V. All rights reserved.
dc.format.extent 492578 bytes-
dc.format.mimetype application/pdf-
dc.relation (關聯) Journal of Magnetism and Magnetic Materials, 322(15), 2227-2230
dc.subject (關鍵詞) Chemical disorder; Compositional heterogeneity; Fe-ions; Iron disilicide; Low temperatures; Magnetic ordering; Magnetic orders; Magnetic studies; Quadrupoles; Shift parameters; Sommerfeld constant; XRD; Calorimetry; Iron compounds; Molybdenum; Nanoparticles; Specific heat; Spin glass; Superparamagnetism; Nanomagnetics
dc.title (題名) Magnetism in nanoparticles of semiconducting FeSi2
dc.type (資料類型) articleen
dc.identifier.doi (DOI) 10.1016/j.jmmm.2010.02.015
dc.doi.uri (DOI) http://dx.doi.org/10.1016/j.jmmm.2010.02.015