Diffusion and saturation solubility of platinum in lead

The diffusivity and saturation solubility of Pt in Pb has been measured over the temperature range 217-320°C using a serial-sectioning technique. The concentration profiles were determined by observing the variation in the melting curve for each slice using differential scanning calorimetry. Thick boundary layers of Pt were deposited which yielded the complementary error function solution to the diffusion equation. The temperature dependence of the diffusivity is given by $D\left(T\right)=(0.011\mathrm{}\pm 0.002)\times \exp [-10.1\mathrm{}\pm \frac{0.02\left(\frac{\mathrm{kcal}}{\mathrm{mole}}\right)}{\mathrm{RT}}]$ ${\mathrm{cm}}^2$/sec. The eutectic temperature was measured as 291.8 ± 0.3°C and the saturation solubility below the eutectic is given by $c_0=(21.9\mathrm{}\pm 2.1)\times \exp [-12.2\mathrm{}\pm \frac{0.1\left(\frac{\mathrm{kcal}}{\mathrm{mole}}\right)}{\mathrm{RT}}]$ atomic fraction.