text: In 2009, Zurek et al. predicted that the alloy  would be a stable metal at only one quarter of the pressure required to metallize hydrogen, and that similar effects should hold for alloys of type LiH and possibly "other alkali high-hydride systems", i.e. alloys of type XH, where X is an alkali metal. This was later verified in AcH and LaH with T approaching 270 K leading to speculation that other compounds may even be stable at mere MPa pressures with room-temperature superconductivity.