Since Cu on Pb(2) is more energetically favorable than Cu on Pb(1) we would expect conventional synthesis methods to favor Cu on Pb(2) over Pb(1). This might make obtaining Cu on Pb(1) more challenging.

https://twitter.com/sineatrix/status/1686659142407405568

My calculations aren't perfect! Nor are there spherical cows... here are some of the main drawbacks to the assumptions and methods:

Now that I have a captive audience…(welcome new followers!) a monster thread on what my paper says, the approximations and the caveats… (1/aleph)

https://twitter.com/sineatrix/status/1686182852667572224

TLDR: My paper did *not* prove nor give evidence of superconductivity in Cu-apatite. It showed interesting structural and electronic properties that have features common with high-Tc superconductors provided Cu is in the right place. Otherwise we get a ‘boring’ semiconductor.