Faasidiagrammien

Faasidiagrammien is a term used in speculative materials science to describe a family of diagrammatic representations that depict phase relationships in complex systems, integrating composition, temperature, pressure, and temporal evolution to map stability and transition pathways. The concept presents phase information beyond traditional equilibrium phase diagrams by incorporating kinetics and probability of transitions.

The term is a neologism formed from faasi (phase) and diagrammen (diagrams) and is not widely standardized. It has appeared in limited scholarly discussions and online glossaries since the early 2020s, typically in the context of high-dimensional phase spaces or education about non-equilibrium phenomena.

Structure and notation. A typical faasidiagrammien extends a conventional phase diagram with extra dimensions. Visualizations may use axes for composition and temperature, with color, shading, or contour lines to indicate stability regions; additional panels or animated sequences convey time evolution or kinetic potential. Some schemes also encode probability of phase transitions with opacity or hatching.

Applications. They are proposed for teaching and exploring phase behavior in multicomponent systems, guiding experiments under non-equilibrium conditions, and communicating complex phase relationships in alloys, polymers, minerals, and electrolytic systems.

Reception and limitations. As a relatively new and informal concept, faasidiagrammien lacks a universal notation or standard practice, which can hinder cross-disciplinary communication and reproducibility. Critics emphasize the need for clear definitions when used in publications.

Related concepts include standard phase diagrams, phase-field modeling, and metastability, which faasidiagrammien complement when non-equilibrium behavior is of interest.