Related Experiment Video
Updated: Jun 3, 2026

In Situ High Pressure Hydrogen Tribological Testing of Common Polymer Materials Used in the Hydrogen Delivery Infrastructure
Published on: March 31, 2018
The influence of hydrogen contamination on the structural stability of CoSn under compression
1Theory and Modeling Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping S-581 83, Sweden.
Abstract:
The binary CoSn compound has a unique ground state large-void crystal structure, whose stability under pressure has recently been examined. Whereas theoretical results predicted a series of phase transformations, the room temperature experiments did not observe any structural change. We suggest that the large void of a CoSn-type structure could contain natural impurities such as hydrogen, which can influence the thermodynamic stability of a CoSn system and explain the unusual disagreement between the theoretical and experimental results. Based on first-principles calculations we reveal that the contamination of CoSn by hydrogen only results in a subtle change of structural parameters and the equation of state of CoSn, but drastically increases the stability of the CoSn-type phase in comparison with the high-pressure phases predicted earlier. We argue that the hardly detectable natural impurities of light elements in porous compounds like CoSn are able to change the phase equilibria.
Related Concept Videos
Stability of Conjugated Dienes
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
Stress Concentrations
Stress Concentrations
The stress concentration...
Relative Stabilities of Alkenes
Behavior of Concrete Under Compressive Load
As the concrete specimen fractures under...
Residual Stresses
