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Structural investigations conducted using transmission electron microscopy(TEM) on LuH2 synthesized under atmospheric pressure (AP-LuH2) andnitrogen-doped LuH2 synthesized under high pressure (HP-LuH2) have revealednumerous microstructural phenomena. Both materials show a clear superstructuremodulation with wave vector, q^* = 1/4 (2-20), and this modulation can be wellinterpreted by the displacements of Lu atoms. Further investigations on thenitrogen-doped HP-LuH2 materials reveal the appearance of high-densityantiphase boundaries, in particular, domain walls of a few atomic layerthickness without structural modulation can be observed, suggesting possibleinterface properties could be detected in this system. In-situ TEM observationsof AP-LuH2 suggest that no evident structural phase transition occurs between94 K and 673 K.

Microstructure and structural modulation of lutetium dihydride LuH2 as seen via transmission electron microscopy