“…According to some authors [35], oxygen content should be kept below 1000 ppm (0.1 wt.%) in order to have a valuable material. It is also known that this oxygen content may affect the phase transformation processes [36]. As it has been seen, the results obtained in this work partially satisfy this oxygen requirement: FSHS þ C compaction route products are within the required oxygen content, while TE þ C compaction route products show elevated oxygen content.…”