The possibility that layered Sc2C is thermodynamically stable motivated us to make this compound via hightemperature solid-state synthesis. In the Y2C synthesis, we observed that high oxygen content in the yttrium led to formation of the cubic phase (YCx). With this in mind, compared to the synthesis performed in Rassaerts et. al.'s 1967 study, we suspected that our use of high purity scandium (with a lower oxygen content) would allow us to experimentally realize our computational prediction. We arc-melted scandium and carbon in ratios from 2:0.9 to 2:1.15, respectively. These arc-melted samples had a high content of the cubic structure (ScCx) (Figure ), but arc-melting has a rapid cool-down, so the structure may not be at equilibrium. Therefore, we followed arc-melting with annealing for 7 days at 1100°C to increase the likelihood of observing the thermodynamically favored layered phase. We found that the cubic structure is stable both at compositions with deficient carbon (Figure ) and excess carbon (Figure ). However, at a composition of 2:0.99, the layered structure was observed, and this is reflected in the new binary phase diagram we propose for the Sc-C system (Figure ) . There is uncertainty in the assignment of the temperature at which the congruent layered-to-cubic phase change occurs, but our experiments indicate that the layered phase is stable to at least 1100°C.