Question

For the diffusion of C in Ti, the following results have been obtained:

Temperature (°C)    D (cm²/s)

736               2 × 10⁻⁹

782               5 × 10⁻⁹

835               1.2 × 10⁻⁸

Please determine the activation energy Q_d and the temperature-independent preexponential D₀. Then calculate the diffusion coefficient D at 500 °C.

Note: Temperature in calculation must be in unit of Kelvin.

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