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Yuzvak
H-Li-N-O-S
H-N-Na-O-Se
Li-Na-Nb-O
Na-Nb-O
F-Mn-Rb
phase transitions
structural transitions
optical properties
temperature for structural transition
phonons
alkali
chalcogen
non-disordered
ferroelectric
nonmetal
orthorhombic
monoclinic
trigonal