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- W2056554036 abstract "Heat capacities of the organic free radical magnet 2-tert-butylaminoxylbenzimidazole (BABI) have been measured in the 0.2−300 K range by adiabatic calorimetry for investigation of its magnetic properties from a thermodynamic viewpoint. An antiferromagnetic phase transition was observed at TN = 1.7 K. A heat capacity hump arising from short-range spin ordering characteristic of low-dimensional magnets was found around 2 K. The magnetic enthalpy and entropy were determined to be 17.4 J mol-1 and 5.34 J K-1 mol-1, respectively. The magnitude of the magnetic entropy is in good agreement with the theoretical value for the magnetic ordering of spin quantum number S = 1/2 systems, R ln 2 = 5.76 J K-1 mol-1, where R is the gas constant. The heat capacity hump above TN is well reproduced by the S = 1/2 two-dimensional antiferromagnetic bilayer Heisenberg model with the intralayer interaction J1/kB = −1.2 K and the interlayer interaction J2/kB = −1.9 K, where kB is the Boltzmann constant. The bilayer model gives a close fit to both the present calorimetric and previously reported magnetic data with very similar intra- and interlayer exchange interaction parameters. Lower dimensionality models (such as dimeric interaction) for the magnetic and heat capacity behavior are not consistent with experimental results." @default.
- W2056554036 created "2016-06-24" @default.
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- W2056554036 date "2002-07-31" @default.
- W2056554036 modified "2023-10-02" @default.
- W2056554036 title "Heat Capacity and Antiferromagnetic Phase Transition of the Organic Free Radical Magnet, 2-<i>tert</i>-Butylaminoxylbenzimidazole (BABI)" @default.
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- W2056554036 doi "https://doi.org/10.1021/jp020630i" @default.
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