Abstract
The thermodynamic model proposed by Miedema is capable of predicting the enthalpy of formation (ΔH) and relative stability of phases in binary but not in ternary or multi-component systems. While developing nanocrystalline binary/ternary metal hydrides for compressor-driven reversible heating–cooling applications, it is necessary to identify appropriate alloy compositions with suitable hydrogen storage capacity and reversible hydrogen absorption–desorption capability. Accordingly, a suitable modification of the Miedema model is proposed in the present study for calculating ΔH of AB2 type of pseudo-binary (Ti–Zr)(Fe–Cr)2 and pseudo-ternary (Ti–Zr)(Fe–Cr)2-H alloys. Subsequently, Gibbs energy (ΔG) of the possible phases is estimated to predict relative phase stability/equilibrium in a given system. It is shown that grain size or interfacial energy contribution exerts a significant influence on ΔG and relative stability of the phases beyond a critical value/limit. Finally, the predicted phase equilibrium from this model-based calculation is validated by suitable comparison with relevant experimental data reported in the literature.
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Acknowledgements
Partial financial support from the Ministry of Non-conventional Energy Sources, New Delhi (Grant no.: 103/08/2001-NT) is gratefully acknowledged. Useful technical discussion with Prof. E. Rabkin and Prof. H. J. Fecht is deeply appreciated.
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Bera, S., Mazumdar, S., Ramgopal, M. et al. Prediction of enthalpy of formation and Gibbs energy change in pseudo-binary (Ti–Zr)(Fe–Cr)2 and pseudo-ternary (Ti–Zr)(Fe–Cr)2-H system using extended Miedema model. J Mater Sci 42, 3645–3650 (2007). https://doi.org/10.1007/s10853-006-1377-9
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DOI: https://doi.org/10.1007/s10853-006-1377-9