New paradigm of a metastable phase diagram presenting structural transformations induced by annealing of Si–C–N amorphous ceramics derived from polymer precursors
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Jerzy Andrzej Golczewski
Abstract
Amorphous Si – C – N domains, nanocrystalline SiC and nanocrystalline Si3N4 identified in the structure of Si – C – N polymer derived ceramics (SiCN PDCs) have been proposed as metastable phases am-SICN, NASIC and NASIN. To study structural transformations of SiCN PDCs, the thermodynamic equilibria of these phases have been computed using previously derived Gibbs energies G(am-SICN), G(NASIC) and G(NASIN). The computational results are presented in the form of metastable phase diagrams. A new paradigm of these diagrams is explained as due to time dependence implemented into the Gibbs energies G(NASIC) and G(NASIN) and the application to interpretation of the crystallization course observed for SiCN PDCs is discussed.
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Articles in the same Issue
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- DGM News
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Articles in the same Issue
- Contents
- Contents
- Feature
- Materials constitution and computational thermodynamics in the context of 100 years of IJMR – Zeitschrift für Metallkunde
- Upgrading CALPHAD to microstructure simulation: the phase-field method
- Prediction, determination and validation of phase diagrams via the global study of energy landscapes
- Alloy development using modern tools
- Phase equilibria and thermal analysis in the Fe–Mn–Ni system
- Integrated approach to thermodynamics, phase relations, liquid densities and solidification microstructures in the Al–Bi–Cu system
- Formation of clathrates Ba–M–Ge(M = Mn, Fe, Co)
- New paradigm of a metastable phase diagram presenting structural transformations induced by annealing of Si–C–N amorphous ceramics derived from polymer precursors
- Basic
- Thermodynamic assessment of the Ce–Si, Y–Si, Mg–Ce–Si and Mg–Y–Si systems
- Thermodynamic re-assessment of the Ti–Al–Nb system
- Effect of varying oxygen partial pressure on the properties of reactively evaporated zinc aluminate thin films
- Applied
- Matrix induced synthesis of Y3Al5O12: Ce phosphor through the Pechini method
- Microstructure and room temperature compressive properties of holmium doped DS NiAl-Cr(Mo)-Hf eutectic alloy
- Evaporation mechanism of aluminum during electron beam cold hearth melting of Ti64 alloy
- 560°C isothermal section of the Zn–Fe–Ni–Si quaternary system at the zinc-rich corner
- DGM News
- Personal
