Multi-component Heterogeneous System

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Presentation transcript:

Multi-component Heterogeneous System Thermodynamics Multi-component Heterogeneous System Byeong-Joo Lee POSTECH - MSE calphad@postech.ac.kr

Property of a Regular Solution

Property of a Regular Solution

Standard States

Standard States

Standard States Which standard states shall we use?

Phase Diagrams - Relation with Gibbs Energy of Solution Phases

Phase Diagrams - Binary Systems

Phase Structure of Multicomponent and Multiphase Systems

Morphological Evolution - from Y.S. Yoo, KIMM

Morphological Evolution - from Y.S. Yoo, KIMM

1. Conditions for equilibrium Phase Equilibrium 1. Conditions for equilibrium 2. Gibbs Phase Rule 3. How to interpret Binary and Ternary Phase Diagrams ▷ Lever-Rule

CVD Diamond - N.M. Hwang et al., J. Crystal Growth 162, 55 (1996) Diamond deposited on silicon substrate Soot deposited on the iron substrate

Driving force of CVD Deposition - from N.M. Hwang, SNU ※ Example: Deposition of Silicon SiH4 + 2Cl2 = Si + 4HCl

Thermodynamic Paradox - from N.M. Hwang, SNU Diamond formation with simultaneous graphite etching in low pressure synthesis of diamond

Phase Diagrams - Binary Systems

Phase Diagrams - Ternary Systems 1273 K 923 K

Assessment of thermodynamic properties in the Na-Al-H ternary system

Assessment of thermodynamic properties in the Li-Al-H ternary system

Interfacial Reactions ? - between Ti and Al2O3