They say diamonds are forever, but diamonds in fact are a metastable form of carbon that will slowly but eventually transform into graphite, another form of carbon. Being able to design and synthesize other long-lived, thermodynamically metastable materials could be a potential gold mine for materials designers, but until now, scientists lacked a rational understanding of them.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2016/11/161118153642.htm
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