Low-frequency IR transmission spectra for a series of isostructural single crystals of CsDy1−xBix(MoO4)2 (x=0, 0.05, 0.1, 0.2, 0.3, 0.5, and 0.7) are measured at low temperatures (T≃6 K). It is found experimentally that absorption band broadening takes place in the Bi concentration range 0.2⩽x⩽0.6. The mechanism which may result in absorption spectrum blurring are considered.
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