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The T-P phase diagram of the Mo–H system studied earlier at hydrogen pressures up to 5.3 GPa and temperatures up to 1200 °C by in-situ X-ray diffraction [Y. Fukai et al. Mater. Trans. 44 (2003) 1359] is re-examined at P ≤ 6 GPa and T ≤ 800 °C using a quenching technique. The formation of the high-temperature fcc MoH hydride at T > 480–570 °C is not confirmed. Instead, the stability region of the...