The structure of R-NiF3, and synthesis,and magnetism of new R3 MIINiIVF6 (M = Fe,Co, Cu,Zn), and MIINiIIF4 (M = Co,Cu) |
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| Affiliation: | 1. Chemistry Department, and Chemical Sciences Division, Lawrence Berkeley Laboratory, The University of California, Berkeley, CA 94720, USA;2. Center for Neutron Research, NIST, Gaithersburg, MD 20899, USA;1. Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, PR China;2. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;3. Institute of Thermal Engineering, China Jiliang University, Hangzhou 310018, PR China;4. School of Building Environment Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, PR China;1. Department of Gastrointestinal Surgery, Stavanger University Hospital, Stavanger, Norway;2. Department of Clinical Medicine, University of Bergen, Bergen, Norway;1. Institute of Public Safety Research, Tsinghua University, China;2. Department of Engineering Physics, Tsinghua University, China;3. School of Information Management, Wuhan University, Wuhan, China;1. The Sheikh Zayed Institute for Pediatric Surgical Innovation, Children''s Research Institute, School of Medicine and Health Sciences, George Washington University, Washington, DC 20010, USA;2. Department of Perioperative Medicine, National Institutes of Health Clinical Center, National Institutes of Health, Bethesda, MD 20892, USA;3. Department of Nutritional Sciences, Howard University, Washington, DC 20059, USA |
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| Abstract: | Neutron diffraction, at 2 K, of R-NiF3 indicates the formulation approaches NiIINiIVF6, with NiII − F = 1.959(3) and NiIV − F = 1.811(3) Å, but 295 K data allow for only a slight increase in any NiIII. Relatives have been precipitated from liquid anhydrous HF, at ≤ 20 °C, by adding K2NiF6 to M(SbF6)2 (M = Co, Cu, Zn) or M(AsF6)2 (M = Fe). CuNiF6 like NiNiF6 is metastable and loses F2 easily, above 40 °C. CuNiF6 is reduced by Xe or C3F6 at −20 °C; CoNiF6 by H2 at 350 °C, each giving pseudo-rutile MNiF4. Magnetic data indicate the dominant formulation is MIINiIVF6 (Ni(IV) low spin d6) with field dependence in CoNiF6 (≤ 220 K) and FeNiF6 (≤ 295 K). |
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