Low-temperature heat capacities and thermodynamic properties of rare-earth triisothiocyanate hydrates (III) —Sm(NCS)3 · 6H2O, Gd(NCS)3 · 6H20, Yb(NCS)3 · 6H20 and Y(NCS)3 · 6H20 |
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| Authors: | Zhicheng Tan Takasuke Matsuo Hiroshi Suga Zhiying Zhang Jingzhi Yin Bengao Jiang Tongshan Sun |
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| Affiliation: | (1) Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023 Dalian, China;(2) Microcalorimetry Research Center and Department of Chemistry, Faculty of Science, Osaka University, Toyonaka, 560 Osaka, Japan;(3) Thermochemistry Laboratory, Northwestern University, 710069 Xi’an, China;(4) Department of Chemistry, Shandong University, 250100 Jinan, China |
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| Abstract: | The heat capacities of four RE isothiocyanate hydrates, Sm(NCS)3, · 6H20, Gd(NCS)3 · 6H20, Yb(NCS)3, · 6H2O and Y(NCS)3, · 6H20, have been measured from 13 to 300 K with a fully-automated adiabatic calorimeter. No obvious thermal anomaly was observed for the above-mentioned compounds in the experimental temperature ranges. The polynomial equations for calculating the heat capacities of the four compounds in the range of 13–300 K were obtained by the least-squares fitting based on the experimentalC P, data. TheC P, values below 13 K were estimated by using the Debye-Einstein heat capacity functions. The standard molar thermodynamic functions were calculated from 0 to 300 K. Gibbs energies of formation were also calculated. Project supported by the National Natural Science Foundation of China. |
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| Keywords: | low-temperature heat capacity rare-earth salt thermodynamic function Sm(NCS)3 · 6H2O Gd(NCS)3 · 6H2O Yb(NCS)3 · 6H2O Y(NCS)3 · 6H2O |
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