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There exists 4 spherical particles of identical radius 10 nm. The particles are pure Zr alloys. If Zr has isotropic surface energy of 1 J/m2,

There exists 4 spherical particles of identical radius 10 nm. The particles are pure Zr alloys. If Zr has isotropic surface energy of 1 J/m2, 

a) find the total surface energies of the particles. 

b) If the particles sinter together to form one big spherical particle, find its final radius and total surface energies.

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