Abstract
AbstractMicrowave‐assisted metathesis reactions from anhydrous rare‐earth metal trichlorides and alkali metal polychalcogenides in dimethylformamide in the temperature interval 160 °C ≤ T ≤ 220 °C yield sub‐micron and nanometer scaled particles of the rare‐earth metal disulfides RES2 (RE = La, Pr, Nd). The samples were characterized by X‐ray powder diffraction, electron microscopy, chemical analysis, and Raman and UV/Vis spectroscopy. The products adopt the monoclinic α‐RES2 type (space group P21/a) and form desert rose‐like agglomerates. The nano‐scaled samples show significantly reduced optical bandgaps compared to the bulk material. The thermal decomposition in air at 550 °C ≤ T ≤ 1000 °C yields rare‐earth metal oxide sulfates RE2O2SO4.
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