STANDARD ENTHALPIES OF FORMATION OF SOME CARBIDES, SILICIDES AND GERMANIDES OF CERIUM AND PRASEODYMIUM
STANDARD ENTHALPIES OF FORMATION OF SOME CARBIDES, SILICIDES AND GERMANIDES OF CERIUM AND PRASEODYMIUM
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DOI：
10.1016/0925-8388(94)06009-6
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发表时间：
1995-04-01
影响因子：
6.2
通讯作者：
KLEPPA, OJ
中科院分区：
文献类型：
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作者：
MESCHEL, SV;KLEPPA, OJ
用直接合成量热法测定了1473+/-2K下Re-X（Re=Ce，Pr或La，X=C，Si或Ge）二元系中某些同熔化合物的标准生成量。报告了Δ H-f度的以下值：CeC 2，-25.4+/-1.4 kJ（摩尔原子）（-1）; CeSi 2，-60.5+/-2.0 kJ（摩尔原子）（-1）; CeSi，-71.1+/-3.3 kJ（摩尔原子）（-1）; Ce 5Ge 3，-73.4+/-2.3 kJ（摩尔原子）（-1）; CeGe 1.6，-75.6+/-1.9 kJ（摩尔原子）（-1）; PrC 2，-29.4+/-1.6 kJ（摩尔原子）（-1）; PrSi 2，-61.5+/-1.7 kJ（摩尔原子）（-1）; PrSi，-78.1+/-1.9 kJ（摩尔原子）（-1）; Pr 5Ge 3，-70.4+/-2.3 kJ（摩尔原子）（-1）; PrGe 1.6，-81.7+/-1.7 kJ（摩尔原子）（-1）; LaSi 2，-56.8+/-2.5 kJ（摩尔原子）（-1）。结果与早期的实验数据进行了比较，从Miedema的半经验模型的预测值，并与Borzone等人获得的Sn和Pb化合物的可用数据，由帕伦佐纳和帕伦佐纳和西拉菲西。
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.