Temperature dependence of entropy of mixing of liquid alkali alloys

Authors

  • B K Singh University Department of Physics, T.M. Bhagalpur University, Bhagalpur
  • Sudhir Singh Department of Physics, R. D. College Sheikhpura, T.M. Bhag. Univ., Bhagalpur
  • Golak Kumar Mandal University Department of Physics, T.M. Bhagalpur University, Bhagalpur
  • Dhiraj Kumar Singh University Department of Physics, T.M. Bhagalpur University, Bhagalpur

DOI:

https://doi.org/10.3126/bibechana.v14i0.15410

Keywords:

Alkali alloys, Semi-empirical approach, Entropy, Helmholtz free energy, Boltzmann Constant, Packing fraction.

Abstract

A semi-empirical approach has been considered to study the temperature dependence of entropy of mixing, (ΔsM), for various alkai-alkali alloys using hard-sphere model. The most important physical parameters occurring here is the hard-sphere diameter (σ) and the packing fraction (η). For pure liquid metals, this is usually determined empirically from the observed entropy as a function of temperature which in turn are utilised to compute ΔSM for Na-K, K-Rb, Na-Rb, NaCs, Rb-Cs and K-Cs alloys as a function of concentration at five different temperature ranging from 400°K-800°K. The study reveals that entropy of mixing for Na-K, Na-Rb and K-Rb systems decreases with increasing temperature. But the result for Cs-based alloys exhibit a mixed behaviour.

BIBECHANA 14 (2017) 16-29

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Published

2016-11-28

How to Cite

Singh, B. K., Singh, S., Mandal, G. K., & Singh, D. K. (2016). Temperature dependence of entropy of mixing of liquid alkali alloys. BIBECHANA, 14, 16–29. https://doi.org/10.3126/bibechana.v14i0.15410

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Section

Research Articles