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Novel iron oxide–silica coreshell powders compacted by using pulsed electric current sintering: Optical and magnetic properties

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Title: Novel iron oxide–silica coreshell powders compacted by using pulsed electric current sintering: Optical and magnetic properties
Authors: Mahmed, N.1,2 norsuria.mahmed@aalto.fi, Heczko, O.3 heczko@fzu.cz, Maki, R.1,4 maki-ryuji@meti.go.jp, Söderberg, O.1 outi.soderberg@aalto.fi, Haimi, E.1 eero.haimi@aalto.fi, Hannula, S-P.1 simo-pekka.hannula@aalto.fi
Source: Journal of the European Ceramic Society. Aug2012, Vol. 32 Issue 11, p2981-2988. 8p.
Subjects: Iron oxides, Silica, Sintering, Electric currents, Powder metallurgy, Nanoparticle synthesis, Magnetic properties of metals, Optical properties of metals
Abstract: Abstract: The properties of the bulk materials consolidated of silica coreshell powders with iron oxide core have been studied. Iron oxide nanoparticles smaller than 20nm in size were synthesized by a reverse co-precipitation process in ambient atmosphere. Coreshell structures with various amounts of iron oxide were prepared via a modified Stöber method. The powders were compacted by using pulsed electric current sintering (PECS) at 1373K. The morphologies, microstructures, phases, optical, and magnetic properties of the samples were studied by using transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray diffraction (XRD), UV–visible spectroscopy (UV–Vis), and vibrating sample magnetometer (VSM). Transmittance values in the 250–800nm range varied with the amount of iron oxide. Sample with the lower content was transparent while the sample with the highest content was opaque with microporosity. The compact with the highest iron oxide content showed the ferromagnetic behaviour at 300K. The phase transformations in the coreshell powders during the sintering process are discussed. [Copyright &y& Elsevier]
Copyright of Journal of the European Ceramic Society is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 76334885
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  Label: Title
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  Data: Novel iron oxide–silica coreshell powders compacted by using pulsed electric current sintering: Optical and magnetic properties
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  Data: <searchLink fieldCode="AR" term="%22Mahmed%2C+N%2E%22">Mahmed, N.</searchLink><relatesTo>1,2</relatesTo><i> norsuria.mahmed@aalto.fi</i><br /><searchLink fieldCode="AR" term="%22Heczko%2C+O%2E%22">Heczko, O.</searchLink><relatesTo>3</relatesTo><i> heczko@fzu.cz</i><br /><searchLink fieldCode="AR" term="%22Maki%2C+R%2E%22">Maki, R.</searchLink><relatesTo>1,4</relatesTo><i> maki-ryuji@meti.go.jp</i><br /><searchLink fieldCode="AR" term="%22Söderberg%2C+O%2E%22">Söderberg, O.</searchLink><relatesTo>1</relatesTo><i> outi.soderberg@aalto.fi</i><br /><searchLink fieldCode="AR" term="%22Haimi%2C+E%2E%22">Haimi, E.</searchLink><relatesTo>1</relatesTo><i> eero.haimi@aalto.fi</i><br /><searchLink fieldCode="AR" term="%22Hannula%2C+S-P%2E%22">Hannula, S-P.</searchLink><relatesTo>1</relatesTo><i> simo-pekka.hannula@aalto.fi</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+the+European+Ceramic+Society%22">Journal of the European Ceramic Society</searchLink>. Aug2012, Vol. 32 Issue 11, p2981-2988. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Iron+oxides%22">Iron oxides</searchLink><br /><searchLink fieldCode="DE" term="%22Silica%22">Silica</searchLink><br /><searchLink fieldCode="DE" term="%22Sintering%22">Sintering</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+currents%22">Electric currents</searchLink><br /><searchLink fieldCode="DE" term="%22Powder+metallurgy%22">Powder metallurgy</searchLink><br /><searchLink fieldCode="DE" term="%22Nanoparticle+synthesis%22">Nanoparticle synthesis</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+properties+of+metals%22">Magnetic properties of metals</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+properties+of+metals%22">Optical properties of metals</searchLink>
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  Label: Abstract
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  Data: Abstract: The properties of the bulk materials consolidated of silica coreshell powders with iron oxide core have been studied. Iron oxide nanoparticles smaller than 20nm in size were synthesized by a reverse co-precipitation process in ambient atmosphere. Coreshell structures with various amounts of iron oxide were prepared via a modified Stöber method. The powders were compacted by using pulsed electric current sintering (PECS) at 1373K. The morphologies, microstructures, phases, optical, and magnetic properties of the samples were studied by using transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray diffraction (XRD), UV–visible spectroscopy (UV–Vis), and vibrating sample magnetometer (VSM). Transmittance values in the 250–800nm range varied with the amount of iron oxide. Sample with the lower content was transparent while the sample with the highest content was opaque with microporosity. The compact with the highest iron oxide content showed the ferromagnetic behaviour at 300K. The phase transformations in the coreshell powders during the sintering process are discussed. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of the European Ceramic Society is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.jeurceramsoc.2012.02.050
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      – Code: eng
        Text: English
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        PageCount: 8
        StartPage: 2981
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      – SubjectFull: Iron oxides
        Type: general
      – SubjectFull: Silica
        Type: general
      – SubjectFull: Sintering
        Type: general
      – SubjectFull: Electric currents
        Type: general
      – SubjectFull: Powder metallurgy
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      – SubjectFull: Nanoparticle synthesis
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      – SubjectFull: Magnetic properties of metals
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      – SubjectFull: Optical properties of metals
        Type: general
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      – TitleFull: Novel iron oxide–silica coreshell powders compacted by using pulsed electric current sintering: Optical and magnetic properties
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            NameFull: Mahmed, N.
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              Text: Aug2012
              Type: published
              Y: 2012
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