STANDARD ENTHALPIES OF FORMATION OF SOME CARBIDES, SILICIDES AND GERMANIDES OF CERIUM AND PRASEODYMIUM

被引：30
|
作者：
MESCHEL, SV
KLEPPA, OJ
机构：
[1] The James Franck Institute, The University of Chicago, Chicago
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 1995年 / 220卷 / 1-2期
关键词：
ENTHALPY OF FORMATION; RARE EARTHS; CARBIDES; SILICIDES; GERMANIDES;
D O I：
10.1016/0925-8388(94)06009-6
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：
The standard enthalpies of formation of some congruent-melting compounds in the binary systems Re-X, where Re=Ce, Pr or La and X=C, Si or Ge have been determined by direct-synthesis calorimetry at 1473+/-2 K. The following values of Delta H-f degrees are reported: CeC2, -25.4+/-1.4 kJ (mol atom)(-1); CeSi2, -60.5+/-2.0 kJ (mol atom)(-1); CeSi, -71.1+/-3.3 kJ (mol atom)(-1); Ce5Ge3, -73.4+/-2.3 kJ (mol atom)(-1); CeGe1.6, -75.6+/-1.9 kJ (mol atom)(-1); PrC2, -29.4+/-1.6 kJ (mol atom)(-1); PrSi2, -61.5+/-1.7 kJ (mol atom)(-1); PrSi, -78.1+/-1.9 kJ (mol atom)(-1); Pr5Ge3, -70.4+/-2.3 kJ (mol atom)(-1); PrGe1.6, -81.7+/-1.7 kJ (mol atom)(-1); LaSi2, -56.8+/-2.5 kJ (mol atom)(-1). The results are compared with earlier experimental data, with predicted values from Miedema's semiempirical model, and with available data obtained for Sn and Pb compounds by Borzone et al., by Palenzona and by Palenzona and Cirafici.
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页码：88 / 93
页数：6
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