Abstract
The crystal structure and atomic dynamics (vibrational properties) of the [Formula: see text] compound are studied at room temperature and under normal conditions. The monoclinic symmetry crystal structure of the P61 space group is explained by the polyhedral structure. The studies were carried out by the method of Raman spectroscopy. In the spectrum obtained in the frequency range [Formula: see text]–800 cm[Formula: see text], four main vibrational modes were observed: [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] cm[Formula: see text]. The analysis showed that these modes correspond to the vibration of different polyhedra. Modes [Formula: see text] and [Formula: see text] cm[Formula: see text] correspond to vibrations of bipyramids, and modes [Formula: see text] and [Formula: see text] cm[Formula: see text] correspond to vibrations of tetrahedra.
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