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- W1965909289 abstract "With a fully automated high temperature calorimeter the enthalpy of formation of the [Pt–Sn] liquid system was determined on the molar fraction range 0<x<0.72 (with x=xPt) between 870 K<T<1660 K. Referring to the liquid constituents [ΔmixHm°], the molar enthalpy of mixing of the [Pt–Sn] liquid alloys, can be described by the following equation (in kJ mol−1):ΔmixHm°=x(1−x)(−123.76−96.27x−119.62x2+88.89x3+97.58x4)withx=xPt.The enthalpies are negative over the entire concentration range with a minimum ΔmixHm°=−46.8±2 kJ mol−1 at x=0.554, independent of temperature. The limiting partial molar enthalpy of mixing of platinum is determined asΔmixhm°∞(Ptsc,xPt=0)=−124±5kJmol−1.Enthalpies of formation and fusion of PtSn and Pt3Sn, respectively, have been determined by calorimetric measurements. They show that PtSn exists in an high temperature (H.T.) and a low temperature (L.T.) form, respectively:ΔforHm°(Pt0.5Sn0.5(L.T.),sol)=−74kJmol−1,ΔforHm°(Pt0.5Sn0.5(H.T.),sol)=−63.5kJmol−1,ΔforHm°(Pt0.75Sn0.25,sol)=−55.3kJmol−1.Moreover, some points of the equilibrium phase diagram were obtained by the calorimetric experiments. The integral and limiting partial enthalpies of mixing have been compared with the data previously obtained for other (T.M.–Sn) systems. The energetic effect is caused by sharing 3 electrons from Sn at most with the uppermost bands of Pt." @default.
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- W1965909289 date "1998-10-01" @default.
- W1965909289 modified "2023-10-18" @default.
- W1965909289 title "Enthalpy of formation of the (Pt–Sn) system" @default.
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- W1965909289 doi "https://doi.org/10.1016/s0925-8388(98)00682-3" @default.
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