Science Explained — updated: 12 October 2026. At first glance, a material seems static: atoms occupy a particular crystal structure, and properties such as hardness, conductivity or magnetism follow from that arrangement. In reality, many solids form through several intermediate states. Some exist only briefly — and those fleeting phases are becoming an increasingly important focus of materials research.
Researchers associated with the University of Warwick have reported on so-called “in-between materials” that appear during chemical transformations. Modern measurement techniques can detect such intermediate phases before they turn into a stable final state.
What is a phase?
In materials science, a phase is a region with a particular atomic order and composition. Carbon, for example, can exist as graphite or diamond. The same elements can therefore have very different properties depending on how their atoms are arranged.
When new materials are synthesised, the process is often simplified as a reaction that converts starting materials into a product. In reality, atoms may pass through several arrangements along the way. Some are only temporarily stable in energetic terms and disappear as the reaction continues or the material cools.
Why we often missed them
Traditional materials characterisation usually examines the finished product. X-ray diffraction can reveal which crystal structure is present at the end, but short-lived states may already have vanished by then.
Time-resolved measurements and powerful data analysis can instead follow the reaction pathway. It is the difference between watching a film and comparing only a before-and-after photograph. Researchers can observe not only which material is produced, but which atomic structures appear on the way.
Why this could matter for batteries
In batteries, electrode materials change their structure during charging and discharging. Intermediate phases can affect how quickly ions move, how much energy can be stored and how rapidly a material degrades. If previously unknown states have particularly useful transport properties, synthesis methods might be adjusted to stabilise them or take advantage of the pathways through which they form.
The same principle may matter for materials designed to store solar energy chemically. Catalysts for hydrogen or other solar fuels operate through reaction intermediates. Better understanding of short-lived structures could help researchers design more efficient materials.
Not a miracle battery yet
The important caveat is that identifying interesting intermediate phases is basic research. It does not mean a battery with twice the range or a market-ready new catalyst is around the corner. There are often years between an observation, reproducible synthesis, scaling, lifetime testing and industrial production.
The scientific advance is initially about expanding the search space. Materials research has long asked: which stable substances can we make? The additional question is now: which useful states appear along the way — and can we preserve them?
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Redaktioneller Hinweis: Research and update status: 12 October 2026. The applications described are research prospects, not market-ready products.