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- W2024870159 abstract "With a fully automated high temperature calorimeter the enthalpy of formation of the [Ir+Ga] liquid system was determined between 1106<Te<1471 K, in the molar fraction range 0<x<0.54 (with x=xtr). The molar enthalpy of formation of the [Ir+Ga] liquid alloys [ΔmaxHm°] corresponding to the reaction, at Te and p°: Ga(liq) + b lr(liq) → Ga, lr(1-a)(liq) can be described by the following Redlich-Kister equation (in kJ mol−1) ΔmaxHm°=x(1−x)ξ(y) with ξ(y)=−257.68−63.09y+76.47y2+14.39y3 and y=xtr − xGa. This function is negative with an estimated minimum ΔmaxHm°=−65±4 kJ mol−1 at x=0.55, and independent of temperature, within the experimental error. The limiting partial molar enthalpy of mixing of iridium, deduced from experiments performed at 1155 and 1482 K, is: Δmaxhm°(Ir supercooled liquid in ∞ liq Ga) = − 132±5 kJ mol−1. On the other hand, by extrapolation of the ξ-function to x = 1, the limiting enthalpy of Ga in supercooled liquid Ir was predicted with a larger uncertainty: Δmaxhm°(Ga liq. in ∞ supercooled liquid Ir) = − 230±30 kJ mol−1. For three compositions (x=0.141, 0.182 and 0.25), the molar heat capacities of the solid alloys have been measured between 423 and 763 K and the enthalpy of formation of IrGa3 was determined by dissolution calorimetry : ΔmaxHm°(Ir0.25Ga0.75; Tamb, sol) = −80 kJ mol−1. Moreover, from these calorimetric experiments, some points of the equilibrium phase diagram were obtained; thus the first shape of the liquidus of the Ir + Ga system (in the Ga-rich region, has been proposed. The integral and limiting partial enthalpies of mixing have been compared with the data previously obtained for the (transition metal + Ga) systems." @default.
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- W2024870159 date "1997-08-01" @default.
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- W2024870159 title "First thermodynamic approach of the (Ir+Ga) system" @default.
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- W2024870159 doi "https://doi.org/10.1016/s0925-8388(97)00114-x" @default.
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