New thermodynamic investigation of some solid phases of Sn-Ti phase diagram

Abstract

Thermodynamic description of the part of Sn-Ti phase diagram is presented using the CALPHAD approach. The thermodynamic parameters of the some phases of system modifying according new experimental phase equilibrium and thermodynamic data. Some phases described as stoichiometric, but another with sublattice models. Ti3Sn, TI5Sn3, TI6Sn5 are modelled with three sublattice modes. Better agreement is obtained by the present optimization. Calculated results are compared with the original experimental data to demonstrate the successfulness of this assessment. The enthalpies of formation of solid phases are calculated and compared by two methods.

Synthesis and Crystal Structure of Zr3V3GeSn4

“…The hexagonal β-phase of Ti 6 Sn 5 has been known for decades and forms in the centrosymmetric P6 3 /mmc space group [19,20]. This phase is purportedly thermodynamically favored over the orthorhombic-structured α-phase at temperatures T > 1063 K [21]. Even at higher temperatures, however, the β-phase sits just at the cusp of stability with even high-quality single crystal samples containing intergrowths of the low-temperature αphase, which take the form of planar-like stacking faults within single crystallites [22].…”