Vaporisation thermodynamic studies over <U3Sn7(cr) + USn2(cr)> and <USn2(cr) + USn(cr)> biphasic regions of U-Sn system using high temperature mass spectrometry

被引：0
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作者：
Trinadh, V. Venkata [1 ]
Manikandan, P. [1 ]
Bera, Suranjan [1 ]
Rao, C. V. S. Brahmananda [1 ,2 ]
机构：
[1] Indira Gandhi Ctr Atom Res, Mat Chem & Met Fuel Cycle Grp, Kalpakkam 603102, Tamil Nadu, India
[2] Homi Bhabha Natl Inst, Mumbai 400094, Maharashtra, India
来源：
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY | 2024年 / 87卷
关键词：
U-Sn system; Pressure-temperature relation; Knudsen Effusion Mass Spectrometry; Enthalpy; Gibbs energy; INTERMETALLIC COMPOUNDS; URANIUM; SYSTEM; HEAT; GA;
D O I：
10.1016/j.calphad.2024.102751
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
High-temperature vaporisation thermodynamic studies over <U3Sn7(cr) + USn2(cr)> and <USn2(cr) + USn(cr)> two-phase regions were carried out by employing Knudsen Effusion Mass Spectrometry (KEMS) in the temperature range 1148-1465 and 1222-1471 K, respectively. Sn(g) was the only species observed in the mass spectra of the equilibrium vapour phase over both the biphasic regions. The partial pressure-temperature relations of Sn(g) were deduced as log(p(Sn)/Pa) = (-15,737 +/- 73)/(T/K)) + (9.52 +/- 0.06) (1148-1465 K) <U3Sn7(cr) + USn2(cr)> and log(p(Sn)/Pa) = (-16,151 +/- 67)/(T/K)) + (9.70 +/- 0.05) (1222-1471 K) <USn2(cr) + USn(cr)> Using p-T relations, the enthalpies of the following heterogeneous reaction equilibria were evaluated by the second law method: U3Sn7(cr) = 3USn(2)(cr) + Sn(g) and USn2(cr) = USn(cr) + Sn(g). Subsequently, the Gibbs energies of the formation of U3Sn7(cr) and USn2(cr) were derived. Knudsen effusion mass spectrometric studies over these two biphasic regions are being reported for the first time.
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页数：8
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