Compound formation in Sn-based liquid alloys

L. C. Prasad; R. N. Singh; V. N. Singh; S. K. Chatterjee

doi:10.1016/0921-4526(95)00393-N

Compound formation in Sn-based liquid alloys

L. C. Prasad^*, R. N. Singh, V. N. Singh, S. K. Chatterjee

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

35 Citations (Scopus)

Abstract

The phenomenon of compound formation in Sn-based liquid alloys (MgSn and CuSn) has been discussed through the study of concentration-dependent thermodynamic and microscopic functions such as activity, excess free energy of mixing G_M^XS, concentration fluctuations in the long-wavelength limit Scc(0) and chemical short-range order (CSRO) parameters. The expressions for these functions have been obtained by using statistical mechanical theory based on compound formation. All the above-mentioned properties of mixing of MgSn and CuSn liquid alloys have been found to be asymmetric around equiatomic compositions. The larger negative values of G_M^XS and maximum deviation of Scc(0) from ideal values (Scc(0,id) at C_Mg = 0.66 in MgSn and at C_Cu = 0.75 in CuSn suggest that Mg₂Sn and Cu₃Sn compounds are formed in MgSn and CuSn systems, respectively. Our study of CSRO reveals that maximum order exists at compound-forming concentrations, i.e. C_Mg = 0.66 in MgSn and C_Cu = 0.75 in CuSn. It is also observed that the tendency for compound formation in MgSn is greater than that of the CuSn system, although the interactions in both systems are not very strong.

Original language	English
Pages (from-to)	225-232
Number of pages	8
Journal	Physica B: Physics of Condensed Matter
Volume	215
Issue number	2-3
DOIs	https://doi.org/10.1016/0921-4526(95)00393-N
Publication status	Published - Oct 2 1995
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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abstract = "The phenomenon of compound formation in Sn-based liquid alloys (MgSn and CuSn) has been discussed through the study of concentration-dependent thermodynamic and microscopic functions such as activity, excess free energy of mixing GMXS, concentration fluctuations in the long-wavelength limit Scc(0) and chemical short-range order (CSRO) parameters. The expressions for these functions have been obtained by using statistical mechanical theory based on compound formation. All the above-mentioned properties of mixing of MgSn and CuSn liquid alloys have been found to be asymmetric around equiatomic compositions. The larger negative values of GMXS and maximum deviation of Scc(0) from ideal values (Scc(0,id) at CMg = 0.66 in MgSn and at CCu = 0.75 in CuSn suggest that Mg2Sn and Cu3Sn compounds are formed in MgSn and CuSn systems, respectively. Our study of CSRO reveals that maximum order exists at compound-forming concentrations, i.e. CMg = 0.66 in MgSn and CCu = 0.75 in CuSn. It is also observed that the tendency for compound formation in MgSn is greater than that of the CuSn system, although the interactions in both systems are not very strong.",

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AU - Singh, V. N.

AU - Chatterjee, S. K.

PY - 1995/10/2

Y1 - 1995/10/2

N2 - The phenomenon of compound formation in Sn-based liquid alloys (MgSn and CuSn) has been discussed through the study of concentration-dependent thermodynamic and microscopic functions such as activity, excess free energy of mixing GMXS, concentration fluctuations in the long-wavelength limit Scc(0) and chemical short-range order (CSRO) parameters. The expressions for these functions have been obtained by using statistical mechanical theory based on compound formation. All the above-mentioned properties of mixing of MgSn and CuSn liquid alloys have been found to be asymmetric around equiatomic compositions. The larger negative values of GMXS and maximum deviation of Scc(0) from ideal values (Scc(0,id) at CMg = 0.66 in MgSn and at CCu = 0.75 in CuSn suggest that Mg2Sn and Cu3Sn compounds are formed in MgSn and CuSn systems, respectively. Our study of CSRO reveals that maximum order exists at compound-forming concentrations, i.e. CMg = 0.66 in MgSn and CCu = 0.75 in CuSn. It is also observed that the tendency for compound formation in MgSn is greater than that of the CuSn system, although the interactions in both systems are not very strong.

AB - The phenomenon of compound formation in Sn-based liquid alloys (MgSn and CuSn) has been discussed through the study of concentration-dependent thermodynamic and microscopic functions such as activity, excess free energy of mixing GMXS, concentration fluctuations in the long-wavelength limit Scc(0) and chemical short-range order (CSRO) parameters. The expressions for these functions have been obtained by using statistical mechanical theory based on compound formation. All the above-mentioned properties of mixing of MgSn and CuSn liquid alloys have been found to be asymmetric around equiatomic compositions. The larger negative values of GMXS and maximum deviation of Scc(0) from ideal values (Scc(0,id) at CMg = 0.66 in MgSn and at CCu = 0.75 in CuSn suggest that Mg2Sn and Cu3Sn compounds are formed in MgSn and CuSn systems, respectively. Our study of CSRO reveals that maximum order exists at compound-forming concentrations, i.e. CMg = 0.66 in MgSn and CCu = 0.75 in CuSn. It is also observed that the tendency for compound formation in MgSn is greater than that of the CuSn system, although the interactions in both systems are not very strong.

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Compound formation in Sn-based liquid alloys

Abstract

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