Thermodynamic measurement of Nd-Fe system by double Knudsen cell mass spectrometry

被引：13
作者：
Nagai, Takashi [1 ]
Shirai, Sho [1 ]
Maeda, Masafumi [1 ]
机构：
[1] Univ Tokyo, Inst Ind Sci, Meguro Ku, Tokyo 1538505, Japan
来源：
THERMOCHIMICA ACTA | 2011年 / 516卷 / 1-2期
关键词：
Thermodynamics; Neodymium-iron alloy; Gibbs energy; VAPOR-PRESSURE; NEODYMIUM; RECOVERY;
D O I：
10.1016/j.tca.2010.12.023
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The activities of Nd in the Nd-Fe alloys were determined by double Knudsen cell mass spectrometry. The activities of Nd in Nd-Fe alloys with Nd concentration from 8.5 to 93 at% were determined at 1373-1523K, measuring the ion current of vapor of Nd in equilibrium with melts, Nd2Fe17 + gamma Fe, Nd2Fe17 + liquid, and gamma Fe + liquid. The standard Gibbs energy of formation of Nd2Fe17 was calculated from the activities of Nd obtained from the measurement, as follows: 2Nd(I) + 17Fe(gamma) = Delta G(f)(o)Nd(2)Fe(17)(s), = -238.000 + 130T +/- (21, 000)J/mol (1373-1473K). The activities of Fe in Nd-Fe alloys were calculated based on the Gibbs-Duhem equation. (C) 2011 Elsevier B.V. All rights reserved.
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页码：8 / 12
页数：5
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