Cyclic Cp Scan. A Netzsch STA 449 F1 instrument was used to obtain cyclic Cp and apparent Cp data. Five consecutive heating-cooling cycles were conducted per sample by heating to 300 °C and cooling to 100 °C with heating and cooling rates of 10 °C min -1 . For each cycle, a baseline and a sapphire reference scan were performed prior to the sample scan using the same temperature program. A platinum crucible was used with a sample amount of ~ 10 -15 mg.