Thermal properties of [Cr(NH3)6](BF4)3 studied by adiabatic and relaxation calorimetry |
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| Institution: | 1. Department of Chemical Physics, Faculty of Chemistry, Jagiellonian University, Kraków 30-060, Poland;2. H. Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, Kraków 31-342, Poland;3. Research Centre for Structural Thermodynamics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan;4. Institute of Experimental Physics, Slovak Academy of Sciences, Ko?ice 040-01, Slovakia;1. Department of Space Equipment, The Academy of Equipment, Beijing 101416, China;2. Department of Scientific Research, The Academy of Equipment, Beijing 101416, China;3. Department of Automation Measurement and Control, Harbin Institute of Technology, Harbin 150001, China;1. College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China;2. Center for Nano Science and Technology of Anhui Normal University, Wuhu 241000, PR China;3. The Key Laboratory of Functional Molecular Solids, Ministry of Education, PR China;1. Department of Inorganic Chemistry, Faculty of Sciences, P. J. ?afárik University in Ko?ice, Moyzesova 11, 041 54 Ko?ice, Slovakia;2. Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), University of Zaragoza-CSIC, Pedro Cerbuna 12, E-50009 Zaragoza, Spain;3. Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón (ICMA), University of Zaragoza-CSIC, Pedro Cerbuna 12, E-50009 Zaragoza, Spain;4. Institute of Physics, P. J. ?afárik University in Ko?ice, Park Angelinum 9, 041 54 Ko?ice, Slovakia;1. Department of Materials Science, Lanzhou University, Lanzhou 730000, China;2. Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, PR China;1. Jagiellonian University, Faculty of Chemistry, Ingardena 3, 30-060 Kraków, Poland;2. Frank Laboratory of Neutron Physics, JINR, Dubna 141980, Russia;3. Institute of Physics, Jagiellonian University, ul. Reymonta 4, 30-059 Kraków, Poland |
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| Abstract: | Four (solid–solid) phase transitions were detected in the temperature range of (9 to 300) K in polycrystalline Cr(NH3)6](BF4)3 at TC1 = 240.7 K, TC2 = 108.0 K, TC3 = 91.9 K, and TC4 = 61.3 K by adiabatic calorimetry. The measurements by relaxation calorimetry were followed on lowering temperature from 20 K down to 0.35 K under six different external magnetic field values (9, 7, 5, 3, 1 and 0) T. For non-zero values of applied magnetic field well-defined Schottky anomaly appears. Magnetic heat capacity was calculated assuming the zero-field splitting for the decoupled Cr(III) ions. There is no discrepancy between the observed and calculated values. Isothermal magnetization curve recorded up to 5 T was measured at temperature of 1.8 K. |
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| Keywords: | Phase transitions Heat capacity Adiabatic and relaxation calorimetry Schottky anomaly |
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