引用本文:
黄永章, 袁文霞, 朱鸿民, 乔芝郁. 非化学计量金属间化合物DO3型Fe3Al热力学性质[J]. 物理化学学报,
2005, 21(03): 273-277.
doi:
10.3866/PKU.WHXB20050309
Citation: HUANG Yong-Zhang, YUAN Wen-Xia, ZHU Hong-Min, QIAO Zhi-Yu. Thermodynamic Properties of Nonstoichiometric Intermetallic Compounds Fe3Al with DO3 Structure[J]. Acta Physico-Chimica Sinica, 2005, 21(03): 273-277. doi: 10.3866/PKU.WHXB20050309
Citation: HUANG Yong-Zhang, YUAN Wen-Xia, ZHU Hong-Min, QIAO Zhi-Yu. Thermodynamic Properties of Nonstoichiometric Intermetallic Compounds Fe3Al with DO3 Structure[J]. Acta Physico-Chimica Sinica, 2005, 21(03): 273-277. doi: 10.3866/PKU.WHXB20050309
非化学计量金属间化合物DO3型Fe3Al热力学性质
摘要:
用以CaF2单晶为固体电解质的电池电动势(EMF)法测定了720～850 K温度区间内(－)Pt|Ir|Al0.85Sn0.15,Na3AlF6|CaF2|AlxFe1－x(x=0.23～0.33),Na3AlF6|Ir|Pt(＋)电池电动势,通过DO3型Fe3Al的粉末化以及选用富Al合金Al0.85Sn0.15作为参比电极,使电池反应较快地达到热力学平衡,EMF测量前后工作电极的X射线衍射分析证明没有化学变化发生.计算了DO3型Fe3Al非化学计量金属间化合物均相范围内组元Al的活度及Al的偏摩尔热力学函数ΔGAl、ΔHAl、ΔSAl ,基于Gibbs-Duhem方程计算了DO3型Fe3Al中另一组元Fe的活度和偏摩尔Gibbs自由能.计算了750 K时DO3型Fe3Al相中Al的扩散热力学因子,在化学计量比成分(xAl=0.25)附近Fe3Al相中Al扩散的热力学因子达到最大值.
English
Thermodynamic Properties of Nonstoichiometric Intermetallic Compounds Fe3Al with DO3 Structure
Abstract:
The electromotive force(EMF) values of the cell (－)Pt|Ir|Al0.85Sn0.15, Na3AlF6|CaF2|AlxFe1－x(x=0.23～0.33), Na3AlF6|Ir|Pt (＋) were measured between 720 K and 847 K using solid galvanic cells with a single-crystal CaF2 electrolyte. For attaining quick thermodynamic equilibrium of the cell, Al0.85Sn0.15 alloy was used as the reference electrode and DO3-Fe3Al was powdered. It was confirmed that there was no chemical transformation in the working electrode by X-ray diffraction experiments before and after EMF measurement. The Al activities in Fe3Al with DO3-ordered nonstoichiometric intermetallic compounds were derived. The partial molar thermodynamic functions ΔGAl、ΔHAl、ΔSAl of Al were calculated. The activities and partial molar Gibbs energies of Fe in the Fe-Al alloys were derived by Gibbs-Duhem equation. The thermodynamic factor in diffusion of aluminum in the Fe3Al phase at 750 K was calculated, and showed a maximum at a composition near the stoichiometric proportion (xAl=0.25).
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