A thermodynamic study of the D03-ordered intermetallic compound Fe3Al

被引：5
作者：
Huang, Yongzhang [3 ]
Yuan, Wenxia [2 ]
Qiao, Zhiyu [3 ]
Semenova, Olga [1 ]
Bester, Gabriel [4 ]
Ipser, Herbert [1 ]
机构：
[1] Univ Vienna, Dept Inorgan Chem Mat Chem, A-1090 Vienna, Austria
[2] Beijing Univ Sci & Technol, Dept Chem, Sch Appl Sci, Beijing 100083, Peoples R China
[3] Beijing Univ Sci & Technol, Sch Met & Ecol Engn, Beijing 100083, Peoples R China
[4] Natl Renewable Energy Lab, Golden, CO 80401 USA
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2008年 / 458卷 / 1-2期
基金：
奥地利科学基金会; 中国国家自然科学基金;
关键词：
metals and alloys; intermetallics; electromotive force; EMF; thermodynamic properties; thermodynamic modeling;
D O I：
10.1016/j.jallcom.2007.04.208
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Thermodynamic activities of aluminum in the iron-aluminum system were determined between about 720 and 850 K for the composition range between 23 and 33 at.% Al which includes the D0(3)-ordered nonstoichiometric intermetallic compound Fe3Al For this purpose an electromotive force method with a single-crystal CaF2 electrolyte was used, and the following cell arrangement was employed: (-)Pt vertical bar Ir vertical bar Al0.85Sn0.15, Na3AlF(6)vertical bar CaF2 vertical bar Al1 +/- xFe3 +/- x, Na3AlF6 vertical bar Ir vertical bar Pt(+). Activities of iron were obtained by means of a Gibbs-Duhem integration for the same composition range. The results of the activity measurements were interpreted in terms of a statistical-thermodynamic model for nonstoichiometric phases with the D0(3)-superstructure based on defect formation energies from the literature. It was found that non-stoichiometry in Fe3Al is caused by anti-structure atoms on two of the three possible sublattices. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：277 / 281
页数：5
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