Metallic hydrogen has been created in a diamond anvil in a Harvard lab.
Diamond anvil cells can use only vanishingly small sample sizes. A typical amount is about 160 cubic micrometers.
If metallic hydrogen is metastable then there are a lot of potential applications.
Metastable would mean that the phases could retain their high-pressure forms for an indefinite period once external forces are removed, much as diamonds formed by high temperatures and pressures deep inside Earth remain diamonds even after they reach the surface, instead of immediately reverting to carbon’s more stable form, graphite. Nellis and others have imagined a host of applications for metastable metallic hydrogen, ranging from.
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