High- <i>T</i> <sub>c</sub> Molecular-Based Magnets: Ferrimagnetic Mixed-Valence Chromium(III)-Chromium(II) Cyanides with <i>T</i> <sub>c</sub> at 240 and 190 Kelvin
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- T. Mallah
- Laboratoire de Chimie des Métaux de Transition, U.A. Centre National de la Recherche Scientifique 419, Université Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris, France
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- S. Thiébaut
- Laboratoire de Chimie des Métaux de Transition, U.A. Centre National de la Recherche Scientifique 419, Université Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris, France
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- M. Verdaguer
- Laboratoire de Chimie des Métaux de Transition, U.A. Centre National de la Recherche Scientifique 419, Université Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris, France
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- P. Veillet
- Institut d'Electronique Fondamentale, U.A. Centre National de la Recherche Scientifique 22, Université de Paris Sud, 91405 Orsay, France
書誌事項
- 公開日
- 1993-12-03
- DOI
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- 10.1126/science.262.5139.1554
- 公開者
- American Association for the Advancement of Science (AAAS)
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説明
<jats:p> Molecular-based magnets with high magnetic-ordering temperatures, <jats:italic>T</jats:italic> <jats:sub>c</jats:sub> , can be obtained by mild chemistry methods by focusing on the bimetallic and mixed-valence transition metal μ-cyanide of the Prussian blue family. A simple orbital model was used to predict the electronic structure of the metal ions required to achieve a high ordering temperature. The synthesis and magnetic properties of two compounds, [Cr <jats:sub>5</jats:sub> (CN) <jats:sub>12</jats:sub> ]⋅10H <jats:sub>2</jats:sub> O and Cs <jats:sub>0.75</jats:sub> [Cr <jats:sub>2.125</jats:sub> (CN) <jats:sub>6</jats:sub> ]⋅5H <jats:sub>2</jats:sub> O, which exhibited magnetic-ordering temperatures of 240 and 190 kelvin, respectively, are reported, together with the strategy for further work. </jats:p>
収録刊行物
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- Science
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Science 262 (5139), 1554-1557, 1993-12-03
American Association for the Advancement of Science (AAAS)