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Probing Site Symmetry Around Eu 3+ in Nanocrystalline ThO 2 Using Time Resolved Emission Spectroscopy
Author(s) -
Gupta Santosh K.,
Bhide Madhusudan Krishnadas,
Godbole Shrikant Vasant,
Natarajan Venkataraman
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13143
Subject(s) - nanocrystalline material , ion , analytical chemistry (journal) , photoluminescence , annealing (glass) , materials science , thermogravimetric analysis , point reflection , crystallography , transmission electron microscopy , spectroscopy , luminescence , chemistry , physics , nanotechnology , condensed matter physics , optoelectronics , organic chemistry , chromatography , quantum mechanics , composite material
ThO 2 : Eu 3+ nanoparticles were synthesized at 300°C by combustion route using urea as a fuel and characterized by thermogravimetric/differential thermal analysis, X‐ray diffraction, transmission electron microscopy, and photoluminescence techniques. To investigate the effect of annealing temperature, as synthesized powder were heated further at 500°C, 700°C, and 900°C. It was observed that extent of asymmetry around Eu 3+ at 700°C/900°C is very high as compared to as‐prepared or 500°C annealed sample. Based on the time resolved emission spectroscopic investigations, it was inferred that two different types of Eu 3+ ions were present in the ThO 2 nanoparticles. In ThO 2 structure, Eu 3+ ions occupy two sites; cubic (O h ) and noncubic (
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