Structural, vibrational and optical properties of Eu3+-doped Gd3NbO7 niobates – The mechanism of their structural phase transition
作者： M. Ptak , B. Pilarek , A. Watras , P. Godlewska , I. Szczygieł
DOI: 10.1016/J.JALLCOM.2019.151892
关键词:
摘要: Abstract We report the structural, phonon and luminescence properties of Eu3+-doped Gd3-xEuxNbO7 niobates prepared by conventional solid state reaction. Although a few different crystal structures pure Gd3NbO7 have been reported so far, their still remain controversial mechanism structural phase transition is not well understood. The temperature-dependent IR Raman spectra show occurring at 340 K. detailed analysis vibrational correlation diagrams as theoretical factor group considerations allowed us to propose assignment observed bands, define symmetry low high-temperature phases explain transformation from Pmcn Cmcm centrosymmetric orthorhombic space group. Powder X-Ray diffraction patterns confirm our analysis. emission, room-temperature excitation decay times are achieve more information on optical studied niobates.
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