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The phase diagram in the system La Se was investigated around the LaSe2 composition. X-ray and microprobe analyses reveal the existence of only two phases, LaSe2 and LaSe1.9, with no solid solution behavior between them. Infrared and Raman spectra of the non-stoichiometric phase suggest that the vacancies in the basal plane of the low-dimensional lattice are disordered. Polarized single crystal Raman...
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