Determination of standard free energy of formation for niobium silicides by EMF measurements

被引：13
|
作者：
Fujiwara, H [1 ]
Ueda, Y
Awasthi, A
Krishnamurthy, N
Garg, SP
机构：
[1] Kyoto Univ, Grad Sch Energy Sci, Kyoto 6068501, Japan
[2] Bhabha Atom Res Ctr, Mat Proc Div, Bombay 400085, Maharashtra, India
来源：
JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2003年 / 150卷 / 08期
关键词：
D O I：
10.1149/1.1591757
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
EMF measurements were carried out at temperatures ranging from 1280 to 1490 K in the following cells: - Mo, Si + NbSi2 + SiO2/SiO2-sat. Li2O-SiO2/NbSi2 + Nb5Si3 + SiO2, Mo +, - Mo, Si + NbSi2 + SiO2/SiO2-sat. Li2O-SiO2/Nb5Si3 + NbO + SiO2, Mo +, and - Mo, NbSi2 + Nb5Si3 + SiO2/SiO2-sat. Li2O-SiO2/Nb5Si3 + NbO + SiO2, Mo +, using SiO2-saturated lithium silicate liquid electrolyte. Each of the cells showed a reliable electromotive force (emf) corresponding to the difference in silicon potential between the electrodes. Based on these emf values measured, the molar standard free energy of formation for NbSi2 and Nb5Si3 were determined to be Delta(GNbSi2)(o)/kJ = -165 + 0.008 (T/K) +/- 13 and Delta(GNb5Si3)(o)/kJ = -526 + 0.009 (T/K) +/- 63, respectively. (C) 2003 The Electrochemical Society.
引用
收藏
页码：J43 / J48
页数：6
相关论文
共 50 条
12345