Magnetic properties of the mixed-valence compounds CaMn3O6 and CaMn4O8 |
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| Authors: | WS Glaunsinger HS Horowitz JM Longo A Chang |
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| Institution: | Department of Chemistry, Arizona State University, Tempe, Arizona 85281 USA;Corporate Research Laboratories, Exxon Research and Engineering Company, Linden, New Jersey 07036 USA;Department of Chemistry, Cornell University, Ithaca, New York 14853 USA |
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| Abstract: | The preparation of two new mixed-valence compounds, CaMn3O6 and CaMn4O8, are described and their magntic and EPR behavior investigated. The Mn moments in both compounds have nearly spinonly values. CaMn3O6 and CaMn4O8 order ferrimagnetically near 3 and 89 K, respectively. The broad, Lorentzian EPR lines indicate a significant exchange interaction between Mn3+ and Mn4+ ions. The magnetic and EPR results suggest a strong ferromagnetic interaction between Mn3+ and Mn4+ ions and a comparable antiferromagnetic Mn3+Mn3+ and/or Mn+Mn4+ interaction. |
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