Abstract
The Zr–Sn binary system has been reinvestigated by several experimental techniques: X-ray diffraction, electron probe micro-analysis, mass density and calorimetry measurements. The existence of a miscibility gap inside the homogeneity domain of the η phase (Zr 5Sn 3–Zr 5Sn 4) has been confirmed. It has been also shown that Zr substitution on the Sn sublattice is responsible for the non-stoichiometry of the A 15 phase (Zr 4Sn). The temperature of the peritectoid reaction β Zr+A15↔α Zr has been determined to be at 1216 K that is 4 0 ∘ below the temperature reported in the literature. All these new experimental data have been taken into account for a new thermodynamic assessment of this system.
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