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Nucleation and Growth

1WS20021 Nucleation and Growth GoalUnderstand the basic thermodynamics behind the nucleationand Growth processes ReferencesHandoutCh. 8, Intro. to Ceramics by Kingery, Bowen and UhlmannMost books on glasses and glass-ceramics HomeworkNone2WS20022 Phase Transformations Considered as a transformation of a homogeneous solution to a mixtureof two phases For a stable solution, Gmix is less than zero. In other words, the solutionis more stable than the individual components Gmix is composed of entropic (-T Smix) and enthalpic ( Hmix) parts Consider1. Hmix less than zero: stable solution2.

Spinodal Decomposition • A continuous phase transformation Initially, small composition changes that are wide-ranging Give interpenetrating microstructure (2 continuous phases) • No thermodynamic barrier to phase separation One phase separates into two Infinitesimal composition changes lower the system free energy • Very important in ...

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