If I take pure carbon and heat it in an inert atmospher, at what temperature will it vaporize into carbon gas?
Do you know the periodic table? https://www.ptable.com/?lang=en
Diamond: 3823 K
Graphite: 3800 K
Graphite: 5100 K
Graphite: 3915 K (unspecified pressure)
Although they don't say under what atmosphere they are melting/boiling/sublimating the carbon.