Phase formation in Mg–Sn–Si and Mg–Sn–Si–Ca alloys

Defect and phase stability of solid solutions of Mg2X with an antifluorite structure: An ab initio study

“…The Mg 2 Si 1À x Sn x alloys were found to have the best dimensionless figure of Merit ZT (about 1.1) close to 800 K [3]. However, a recent study of the phase diagram of the Mg 2 Si 1 À x Sn x solid solution questions us about the stability of these alloys [4]. Indeed, contrary to a previous work indicating that the alloys investigated in [3] have a single-phase composition [5], this work indicates that this is not the case and that these compounds are two-phase compounds with compositions inside a miscibility gap [4].…”

“…However, a recent study of the phase diagram of the Mg 2 Si 1 À x Sn x solid solution questions us about the stability of these alloys [4]. Indeed, contrary to a previous work indicating that the alloys investigated in [3] have a single-phase composition [5], this work indicates that this is not the case and that these compounds are two-phase compounds with compositions inside a miscibility gap [4]. Conversely, in the case of Mg 2 Si 1À x Ge x , a complete solid solution seems to exist [6], making these compounds more attractive, but the cost of Ge is an obstacle in this case.…”

Phase selection during calcium silicide formation for layered and powder growth

“…The phase formation and transformation of multi-component compound systems have been intensively discussed based on thermodynamic considerations [1][2][3][4][5][6][7][8]. For the case of phase formation and phase stability, thermodynamic descriptions were developed using thermodynamic models for Cr-Sn-Ti [1] and Al-Zn-Mg-Si [2].…”

“…The chemical potentials consideration was made for the growth of gold-seeded III-V semiconductor nanowires [3]. On the other hand, for the case of growth phase evolution, the preferable phase formation or phase selection was investigated under the consideration of thermodynamics for Mg-Sn-Si and Mg-Sn-Si-Ca [4] and Fe-Co [5]. The phase transformation or the solidification pathways was investigated for from anantase to rutile [6], Mg-Pd nanoparticles [7] and Mg-Zn-Y-Zr alloys [8].…”

Numerical and Experimental Investigations on the Growth of the Intermetallic Mg2Si Phase in Mg Infiltrated Si‐Foams

“…From the phase diagram, [10,11] as well as the anti-fluorite structure, the magnesium silicide phase is exactly stoichiometric and the ratio of the concentration of Mg to Si in the intermetallic phase is precisely 2. Following the phase diagram and the stoichiometric assumption, there is no chance to establish a concentration gradient in the intermetallic phase and, therefore, the intermetallic layer is a "diffusion barrier", wherein the substitution-diffusion is not permitted.…”