A detailed experimental study of the triple point pressure of carbon using laser heating techniques has been completed. Uncertainties and conflicts in previous investigations have been addressed and substantial data presented which places the solid-liquid-vapor carbon triple point at 107 ± 2 atmospheres (10.8± 0.2 MPa). This is in agreement with most investigations which have located the triple point pressure between 100 and 120 atmospheres (10 to 12 MPa), but is in disagreement with recent low pressure carbon, experiments. The absence of any significant polymorphs of carbon other than graphite suggests that the graphite-liquid-vapor triple point has been measured.
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