> One of the materials is most likely impossible to synthesize
Is this a "actual impossible because it's inherently contradictory", or "we just don't know how to do it yet but give us a year"?
"Likely Impossible" as in, we would need a revolutionary discovery in how thermodynamics apply to crystal formation.
We don't know a way to precisely place atoms in a checkerboard pattern like that, without getting it so hot that the arrangement is destroyed.
It maybe could be possible but beyond the reach of current material science.