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Nd 2 O 2 (O 2 ) has been formed at very high oxygen pressures in an unsuccessful attempt to prepare neodymium(IV) dioxide, Nd 4+ O 2 , and contains oxide (O 2− ) and peroxide (O ) ions. The structure of Nd 2 O 2 (O 2 ) closely resembles that of CaF 2 and its full vibrational spectra could be interpreted in terms of this structure. Although Nd 2 O 2 (O 2 ) has a monclinic structure, its vibrational spectra are not in agreement with the monoclinic B‐type phase of the lanthanide(III) sesquioxides, and it is shown why this is so. Many of the NdO vibrational modes in Nd 2 O 2 (O 2 ) agree, however, with those observed in the trigonal A‐type Nd 2 O 3 , and the ν (OO) stretching and NdOO bending modes could be clearly identified.
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Heyns et al. (1994) studied this question.
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