Synthesis, Structure, and Magnetic Properties of Co, Ni, and Co−Ni Alloy Nanocluster-Doped SiO2 Films by Sol−Gel Processing
Identifieur interne : 001755 ( Main/Exploration ); précédent : 001754; suivant : 001756Synthesis, Structure, and Magnetic Properties of Co, Ni, and Co−Ni Alloy Nanocluster-Doped SiO2 Films by Sol−Gel Processing
Auteurs : G. Mattei [Italie, Inde] ; C. De Julián Fernández [Italie, Inde] ; P. Mazzoldi [Italie, Inde] ; C. Sada [Italie, Inde] ; G. De [Italie, Inde] ; G. Battaglin [Italie, Inde] ; C. Sangregorio [Italie, Inde] ; D. Gatteschi [Italie, Inde]Source :
- Chemistry of Materials [ 0897-4756 ] ; 2002.
Abstract
The optical, structural, and magnetic properties of Co, Ni, and CoxNi100-x (0 < x < 100) alloy nanoclusters in silica host obtained by the sol−gel route are presented. Throughout the entire range of composition investigated, from pure Ni to pure Co, the nanoclusters exhibit an fcc structure, with lattice parameters increasing with the Co fraction in the system. This indicates Co−Ni alloy formation. It has also been observed that the average cluster diameter increases with increasing Co fraction in the system. An enhancement of the magnetic moment was exhibited in the pure Co and Ni samples, and good agreement between the measured values and those of the corresponding bulk alloys was found for the other samples. All composites are superparamagnetic at room temperature.
Url:
DOI: 10.1021/cm021106r
Affiliations:
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Gatteschi</name><affiliation wicri:level="4"><country xml:lang="fr">Italie</country><wicri:regionArea>INFM, Dipartimento di Fisica, Università di Padova, via Marzolo 8, I-35131 Padova</wicri:regionArea><orgName type="university">Université de Padoue</orgName><placeName><settlement type="city">Padoue</settlement><region type="region" nuts="2">Vénétie</region></placeName></affiliation><affiliation wicri:level="1"><country xml:lang="fr">Inde</country><wicri:regionArea>Sol−Gel Division, Central Glass and Ceramic Research Institute,196 Raja S.C. Mullick Road, Kolkata 700032</wicri:regionArea><wicri:noRegion>Kolkata 700032</wicri:noRegion></affiliation><affiliation wicri:level="1"><country xml:lang="fr">Italie</country><wicri:regionArea>INFM, Dipartimento di Chimica Fisica, Università di Venezia, Calle Larga S. Marta 2137,I-30123 Padova</wicri:regionArea><wicri:noRegion>I-30123 Padova</wicri:noRegion></affiliation><affiliation wicri:level="1"><country xml:lang="fr">Italie</country><wicri:regionArea>Dipartimento di Chimica, Università di Firenze, via della Lastruccia 5,I-50019 Sesto Fiorentino (Firenze)</wicri:regionArea><wicri:noRegion>I-50019 Sesto Fiorentino (Firenze)</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Chemistry of Materials</title><title level="j" type="abbrev">Chem. Mater.</title><idno type="ISSN">0897-4756</idno><idno type="eISSN">1520-5002</idno><imprint><publisher>American Chemical Society</publisher><date type="e-published" when="2002-07-12">2002</date><date when="2002-08-19">2002</date><biblScope unit="vol">14</biblScope><biblScope unit="issue">8</biblScope><biblScope unit="page" from="3440">3440</biblScope><biblScope unit="page" to="3447">3447</biblScope></imprint><idno type="ISSN">0897-4756</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0897-4756</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract">The optical, structural, and magnetic properties of Co, Ni, and CoxNi100-x (0 < x < 100) alloy nanoclusters in silica host obtained by the sol−gel route are presented. Throughout the entire range of composition investigated, from pure Ni to pure Co, the nanoclusters exhibit an fcc structure, with lattice parameters increasing with the Co fraction in the system. This indicates Co−Ni alloy formation. It has also been observed that the average cluster diameter increases with increasing Co fraction in the system. An enhancement of the magnetic moment was exhibited in the pure Co and Ni samples, and good agreement between the measured values and those of the corresponding bulk alloys was found for the other samples. All composites are superparamagnetic at room temperature.</div></front></TEI><affiliations><list><country><li>Inde</li><li>Italie</li></country><region><li>Vénétie</li></region><settlement><li>Padoue</li></settlement><orgName><li>Université de Padoue</li></orgName></list><tree><country name="Italie"><region name="Vénétie"><name sortKey="Mattei, G" sort="Mattei, G" uniqKey="Mattei G" first="G." last="Mattei">G. 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De</name><name sortKey="De, G" sort="De, G" uniqKey="De G" first="G." last="De">G. De</name><name sortKey="De, G" sort="De, G" uniqKey="De G" first="G." last="De">G. De</name><name sortKey="Gatteschi, D" sort="Gatteschi, D" uniqKey="Gatteschi D" first="D." last="Gatteschi">D. Gatteschi</name><name sortKey="Gatteschi, D" sort="Gatteschi, D" uniqKey="Gatteschi D" first="D." last="Gatteschi">D. Gatteschi</name><name sortKey="Gatteschi, D" sort="Gatteschi, D" uniqKey="Gatteschi D" first="D." last="Gatteschi">D. Gatteschi</name><name sortKey="Mattei, G" sort="Mattei, G" uniqKey="Mattei G" first="G." last="Mattei">G. Mattei</name><name sortKey="Mattei, G" sort="Mattei, G" uniqKey="Mattei G" first="G." last="Mattei">G. Mattei</name><name sortKey="Mattei, G" sort="Mattei, G" uniqKey="Mattei G" first="G." last="Mattei">G. Mattei</name><name sortKey="Mazzoldi, P" sort="Mazzoldi, P" uniqKey="Mazzoldi P" first="P." last="Mazzoldi">P. 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