Experimental determination of the H–Hf phase diagram using in situ neutron diffraction
Résumé
The Hf-H(D) system was studied using in situ neutron diffraction as a function of composition (up to 2 D/Hf) and temperature (up to 900°C). This allowed to complement the previous knowledge about this system, in particular from the points of view of the phase existence and of the phase diagram. Two major findings are: the observation of a new phase (, PtS structure type) of composition HfH similar to the monohydride found in H-Zr system, in accordance with previous first-principles calculations, and the structure determination of the ' phase (new structure type), an ordered superstructure of the phase (CaF 2 structure type). Phase relations are established, and a new phase diagram is proposed.
Domaines
Chimie
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manuscript_v3_hal.pdf (1.04 Mo)
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SupMat_v3.pdf (840.52 Ko)
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