Infrared spectra of (NH4)2BeF4
The infrared spectra (4000-250 cm−1) of (NH4)2BeF4 powder have been recorded at ∼300K (paraelectric phase) and 120K (ferroelectric phase). Observed bands have been consistently attributed to different internal modes of NH4+ and BeF4−2 ions; a few bands also arise due to combination of these modes. The frequencies of librational modes of NH4+ and BeF4−2 ions have been estimated to be ∼370 and ∼100 cm−1, respectively, from combination modes.
Volume 134, 2022
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