Metal Table 11.1 Degree of Supercooling AT AT (°C) 135 Antimony (Homogeneous Germanium Nucleation) for Silver Several Me

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Metal Table 11 1 Degree Of Supercooling At At C 135 Antimony Homogeneous Germanium Nucleation For Silver Several Me 1 (561.98 KiB) Viewed 28 times

Metal Table 11.1 Degree of Supercooling AT AT (°C) 135 Antimony (Homogeneous Germanium Nucleation) for Silver Several Metals Gold 230 Copper 236 Iron 295 Nickel Cobalt 3.30 332 Source: D. Turnbull and R. E. Cech. "Microscopic Observation of the Solidification of Small Metal Droplets." J. Appl. Phys. 21, 808 (1950). Palladium Melting Point of Solid Iron - 1538°C (a) For the solidification of iron, calculate the critical radius * and the activation free energy G* if nucleation is homogeneous. The values for the latent heat of fusion and surface free energy are 1.85 x 10 J/m³ and 0.204 J/m², respectively. Use the super-cooling value found in Table 11.1. (b) Now calculate the number of atoms found in a nucleus of critical size. Assume a lattice parameter of 0.292 nm for solid iron at its melting temperature. [10 Marks]