Evolution of structure, microstructure and hyperfine properties of nanocrystalline Fe50Co50 powders prepared by mechanical alloying
Identifieur interne : 000553 ( Main/Exploration ); précédent : 000552; suivant : 000554Evolution of structure, microstructure and hyperfine properties of nanocrystalline Fe50Co50 powders prepared by mechanical alloying
Auteurs : K. Akkouche [Algérie] ; A. Guittoum [Algérie] ; N. Boukherroub [Algérie] ; N. Souami [Algérie]Source :
- Journal of magnetism and magnetic materials [ 0304-8853 ] ; 2011.
Descripteurs français
- Pascal (Inist)
- Microstructure, Alliage mécanique, Broyeur boulet, Distribution concentration, Structure locale, Dépendance temps, Diffraction RX, Microscopie électronique balayage, Spectrométrie dispersive, Effet Mössbauer, Paramètre cristallin, Grosseur grain, Champ magnétique hyperfin, Nanocristal, Fer alliage, Cobalt alliage, Métal transition alliage.
English descriptors
- KwdEn :
- Ball mill, Cobalt alloys, Concentration distribution, Dispersive spectrometry, Grain size, Hyperfine magnetic field, Iron alloys, Lattice parameters, Local structure, Mechanical alloying, Microstructure, Moessbauer effect, Nanocrystal, Scanning electron microscopy, Time dependence, Transition element alloys, XRD.
Abstract
Nanostructured Fe50Co50 powders were prepared by mechanical alloying of Fe and Co elements in a vario-planetary high-energy ball mill. The structural properties, morphology changes and local iron environment variations were investigated as a function of milling time (in the 0-200 h range) by means of X-ray diffraction, scanning electron microscopy (SEM), energy dispersive X-ray analysis and 57Fe Mössbauer spectroscopy. The complete formation of bcc Fe50Co50 solid solution is observed after 100 h milling. As the milling time increases from 0 to 200 h, the lattice parameter decreases from 0.28655 nm for pure Fe to 0.28523 nm, the grain size decreases from 150 to 14 nm, while the meal level of strain increases from 0.0069% to 1.36%. The powder particle morphology at different stages of formation was observed by SEM. The parameters derived from the Mössbauer spectra confirm the beginning of the formation of Fe50Co50 phase at 43 h of milling. After 200 h of milling the average hyperfine magnetic field of 35 T suggests that a disordered bcc Fe-Co solid solution is formed.
Affiliations:
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Akkouche</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>LMMC, M'hamed Bougara University</s1><s2>Boumerdes 35000</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>Boumerdes 35000</wicri:noRegion></affiliation></author><author><name sortKey="Guittoum, A" sort="Guittoum, A" uniqKey="Guittoum A" first="A." last="Guittoum">A. Guittoum</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Nuclear Research Centre of Algiers, 2 Bd Frantz Fanon</s1><s2>BP399 Alger-Gare, Algiers</s2><s3>DZA</s3><sZ>2 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Algérie</country><placeName><settlement type="city">Alger</settlement><region nuts="2">Wilaya d'Alger</region></placeName></affiliation></author><author><name sortKey="Boukherroub, N" sort="Boukherroub, N" uniqKey="Boukherroub N" first="N." last="Boukherroub">N. Boukherroub</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>LMMC, M'hamed Bougara University</s1><s2>Boumerdes 35000</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>Boumerdes 35000</wicri:noRegion></affiliation></author><author><name sortKey="Souami, N" sort="Souami, N" uniqKey="Souami N" first="N." last="Souami">N. Souami</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Nuclear Research Centre of Algiers, 2 Bd Frantz Fanon</s1><s2>BP399 Alger-Gare, Algiers</s2><s3>DZA</s3><sZ>2 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Algérie</country><placeName><settlement type="city">Alger</settlement><region nuts="2">Wilaya d'Alger</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Journal of magnetism and magnetic materials</title><title level="j" type="abbreviated">J. magn. magn. mater.</title><idno type="ISSN">0304-8853</idno><imprint><date when="2011">2011</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of magnetism and magnetic materials</title><title level="j" type="abbreviated">J. magn. magn. mater.</title><idno type="ISSN">0304-8853</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Ball mill</term><term>Cobalt alloys</term><term>Concentration distribution</term><term>Dispersive spectrometry</term><term>Grain size</term><term>Hyperfine magnetic field</term><term>Iron alloys</term><term>Lattice parameters</term><term>Local structure</term><term>Mechanical alloying</term><term>Microstructure</term><term>Moessbauer effect</term><term>Nanocrystal</term><term>Scanning electron microscopy</term><term>Time dependence</term><term>Transition element alloys</term><term>XRD</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Microstructure</term><term>Alliage mécanique</term><term>Broyeur boulet</term><term>Distribution concentration</term><term>Structure locale</term><term>Dépendance temps</term><term>Diffraction RX</term><term>Microscopie électronique balayage</term><term>Spectrométrie dispersive</term><term>Effet Mössbauer</term><term>Paramètre cristallin</term><term>Grosseur grain</term><term>Champ magnétique hyperfin</term><term>Nanocristal</term><term>Fer alliage</term><term>Cobalt alliage</term><term>Métal transition alliage</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Nanostructured Fe<sub>50</sub>Co<sub>50</sub> powders were prepared by mechanical alloying of Fe and Co elements in a vario-planetary high-energy ball mill. The structural properties, morphology changes and local iron environment variations were investigated as a function of milling time (in the 0-200 h range) by means of X-ray diffraction, scanning electron microscopy (SEM), energy dispersive X-ray analysis and <sup>57</sup>Fe Mössbauer spectroscopy. The complete formation of bcc Fe<sub>50</sub>Co<sub>50</sub> solid solution is observed after 100 h milling. As the milling time increases from 0 to 200 h, the lattice parameter decreases from 0.28655 nm for pure Fe to 0.28523 nm, the grain size decreases from 150 to 14 nm, while the meal level of strain increases from 0.0069% to 1.36%. The powder particle morphology at different stages of formation was observed by SEM. The parameters derived from the Mössbauer spectra confirm the beginning of the formation of Fe<sub>50</sub>Co<sub>50</sub> phase at 43 h of milling. After 200 h of milling the average hyperfine magnetic field of 35 T suggests that a disordered bcc Fe-Co solid solution is formed.</div></front></TEI><affiliations><list><country><li>Algérie</li></country><region><li>Wilaya d'Alger</li></region><settlement><li>Alger</li></settlement></list><tree><country name="Algérie"><noRegion><name sortKey="Akkouche, K" sort="Akkouche, K" uniqKey="Akkouche K" first="K." last="Akkouche">K. Akkouche</name></noRegion><name sortKey="Boukherroub, N" sort="Boukherroub, N" uniqKey="Boukherroub N" first="N." last="Boukherroub">N. Boukherroub</name><name sortKey="Guittoum, A" sort="Guittoum, A" uniqKey="Guittoum A" first="A." last="Guittoum">A. Guittoum</name><name sortKey="Souami, N" sort="Souami, N" uniqKey="Souami N" first="N." last="Souami">N. Souami</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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