Abstract
A simple statistical mechanical theory based on compound formation model (compound Aμ Bv formed by the preferential arrangement of A and B constituent atoms of the alloy AB, μA + νB ≒ Aμ Bv) has been used to investigate the phenomena of compound formation in NaCd liquid alloys through the study of concentration fluctuation in the long wavelength region [Scc(0)] and chemical short range order parameter (α1). The study explains the observed asymmetry successfully and suggest the existence of Cd2Na complex in the melt. The tendency of compound has been found to be weak. A tendency of inversion from segregation to order although very small, has been observed, in NaCd liquid alloys.
Highlights
The value of excess free energy of mixing GMXS for NaCd liquid alloys is small (–4.49 KJ at Ccd 0.66 ), still it shows asymmetry around equiatomic composition
A simple statistical mechanical theory based on compound formation model has been used to investigate the phenomena of compound formation in NaCd liquid alloys through the study of concentration fluctuation in the long wavelength region [SCC(0)] and chemical short range order parameter (α1)
Theoreticians have worked with various theoretical models [1,2,3,4,5,6,7,8,9,10], to understand the alloying behavior of compound forming binary molten alloys
Summary
The value of excess free energy of mixing GMXS for NaCd liquid alloys is small (–4.49 KJ at Ccd 0.66 ), still it shows asymmetry around equiatomic composition. This interesting aspect led the authors to undertake a theoretical investigation of NaCd liquid alloys. Many theoretical models based on the above assumptions have been used to investigate the alloying behavior of such type of binary molten alloys The microscopic properties such as [SCC(0), α1] show maximum deviation from ideal behavior around compound forming concentration and α1 has large negative values indicating chemical order essential for compound formation. In the present investigation, a simple theoretical model [2,7,8,9,10,11] of compound formation has been used to investigate the asymmetry in the property of mixing [Scc(o), α1] of Cd2Na compound forming liquid alloys
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