A technique for measuring thermal vacancy concentrations in stoichiometric FeAl

被引：17
|
作者：
Schneibel, JH
Pike, LM
机构：
[1] Oak Ridge Natl Lab, Mat & Ceram Div, Oak Ridge, TN 37831 USA
[2] Haynes Int Inc, Kokomo, IN 46904 USA
来源：
INTERMETALLICS | 2004年 / 12卷 / 01期
关键词：
iron alummides (based on FeAl); thermal properties; thermodynamic properties; defects point defects; vacancies; diffraction (X-ray);
D O I：
10.1016/j.intermet.2003.09.003
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：
A technique for measuring thermal vacancy concentrations in FeAl is described. The densities of specimens quenched from different temperatures (to freeze in the thermal vacancies) were obtained from room temperature lattice parameter and bulk density measurements. The two sets of density data were extrapolated to a quenching temperature of 0 K and adjusted to match at that temperature. From the adjusted density values the vacancy concentrations were calculated as a function of temperature. The vacancy formation enthalpy for stoichiometric FeAl was found to be (0.51+/-0.14) eV. A comparison with published experimental and theoretical formation enthalpies showed considerable uncertainty in measuring and interpreting the formation energy. As a result, the formation energy for thermal vacancies in stoichiometric FeAl is believed to be somewhere between 0.5 and 0.8 eV. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码：85 / 90
页数：6
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