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The Standard Enthalpies of Formation of Some Binary Intermetallic Compounds of Lanthanide – Iron Systems by High Temperature Direct Synthesis Calorimetry

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SEMINAR
The State Key Lab of
High Performance Ceramics and Superfine Microstructure
Shanghai Institute of Ceramics, Chinese Academy of Sciences
中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室

The Standard Enthalpies of Formation of Some Binary Intermetallic Compounds of Lanthanide – Iron Systems by High Temperature Direct Synthesis Calorimetry

Speaker

Dr. Susan Meschel

University of Chicago

时间:10月23日 (星期二)下午14:30

地点:2号楼607会议室

联系人:张文清 研究员

Abstract

The standard enthalpies of formation of intermetallic compounds of some Lanthanide-iron  systems have been measured by high temperature direct synthesis calorimetry at 1373 2K. The following results in kJ/mole of atoms are reported: Ce2Fe17(-1.6  2.8);  Pr2Fe17(-0.2 3.0); Nd2Fe17(-3.0 2.7); Sm2Fe17(-3.1 3.2 ); GdFe2(-2.4 3.0); HoFe2(-2.6 3.3); ErFe2(-1.9 3.0); TmFe2(-2.2 2.8); LuFe2(-3.6  3.1).

The standard enthalpies of formation of some binary and ternary shape memory alloys have also been measured. These are: Terfenol-D(-1.5 3.1), Samfenol(-13.6 3.1), Galfenol(-10.4 2.8).The values are compared with predicted values of the semi empirical model of  Miedema and Coworkers and with predictions  by ab initio calculations. We will present a systematic picture of how the enthalpies of formation may be related to the atomic number of the Lanthanide element. We will also compare the thermochemical behavior of LA-Ni and the LA-Fe alloys.

 
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