Why Mg${}_2$IrH${}_6$ is predicted to be a high temperature superconductor, but Ca${}_2$IrH${}_6$ is not

Xiaoyu Wang, Warren Pickett, Micheal Hutcheon +2

The X${}_2$MH${}_6$ family, consisting of an electropositive cation X and a main group metal M octahedrally coordinated by hydrogen, has been predicted to hold promise for high-tempera…