Activities of Ti in Ti-C Solid Solutions

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  • TiC固溶体のTiの活量
  • TiC コヨウタイ ノ Ti ノ カツリョウ

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(1) In order to measure the activities of Ti in Ti-C solid solutions, three kinds of cells,<BR>[ (a)] Ti, TiF3|CaF2|TiF3, Ti-C [ (b)] Ti, TiF3-CaF2|CaF2|CaF2-TiF3, Ti-C [ (c)] Ti, KTiF4, K3TiF6|CaF2|K3TiF6, KTiF4, Ti-C were constructed, and useful data were obtained by using the cell (c). Cells (a) and (b) were both unsuitable for measurement.<BR>(2) Standard Gibbs free energy of formation ΔGf° of TiC1.0 at 580°C was −45.3 kcal/mol.<BR>(3) The activities of Ti in TiC1.0, TiC0.92, TiC0.89, TiC0.81, TiC0.76, TiC0.71 were 2.4×10−12, 1.52×10−11, 5.2×10−11, 1.15×10−6, 9.13×10−3, 1.87×10−1, respectively.<BR>(4) The activities of C in Ti-C were calculated from the activities of Ti using Gibbs-Duhem’s equation, and the free energies of mixing were calculated from the activities of Ti and C. A minimum value of −22.4 kcal/mol for the free energy of mixing was obtained at the composition NC=0.45 (TiC0.82).

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