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Structural, vibrational and optical properties of Eu3+-doped Gd3NbO7 niobates – The mechanism of their structural phase transition
- Source :
- Journal of Alloys and Compounds. 810:151892
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
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 of pure Gd3NbO7 have been reported so far, their properties still remain controversial and the mechanism of their structural phase transition is not well understood. The temperature-dependent IR and Raman spectra show a structural phase transition occurring at 340 K. The detailed analysis of vibrational spectra and correlation diagrams as well as theoretical factor group considerations allowed us to propose the detailed assignment of the observed bands, define the symmetry of low and high-temperature phases and explain the mechanism of their structural transformation from the Pmcn to the Cmcm centrosymmetric orthorhombic space group. Powder X-Ray diffraction patterns confirm our analysis. The temperature-dependent emission, room-temperature excitation spectra and luminescence decay times are reported to achieve more information on structural and optical properties of the studied niobates.
- Subjects :
- Diffraction
Materials science
Phonon
Mechanical Engineering
Doping
Metals and Alloys
Physics::Optics
Walsh diagram
02 engineering and technology
Crystal structure
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Condensed Matter::Materials Science
symbols.namesake
Mechanics of Materials
Chemical physics
Materials Chemistry
symbols
Orthorhombic crystal system
0210 nano-technology
Luminescence
Raman spectroscopy
Subjects
Details
- ISSN :
- 09258388
- Volume :
- 810
- Database :
- OpenAIRE
- Journal :
- Journal of Alloys and Compounds
- Accession number :
- edsair.doi...........265c9311d529271c47e4ecb2130f4e66