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GaPO 4 –EuPO 4 System in NanoSize Dimensions: An Investigation Based on Luminescence and 31 P Magic Angle Spinning Nuclear Magnetic Resonance Techniques
Author(s) -
Naidu Boddu S.,
Vishwanadh Bathula,
Sudarsan Vasanthakumaran,
Vatsa Rajesh K.
Publication year - 2011
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/j.1551-2916.2011.04512.x
Subject(s) - magic angle spinning , luminescence , ion , hexagonal phase , nanoparticle , magic angle , materials science , resonance (particle physics) , analytical chemistry (journal) , ion exchange , anisotropy , chemistry , crystallography , nuclear magnetic resonance , nuclear magnetic resonance spectroscopy , hexagonal crystal system , atomic physics , nanotechnology , physics , stereochemistry , optoelectronics , organic chemistry , chromatography , quantum mechanics
GaPO 4 nanoparticles having hexagonal structure with different amounts of Eu 3+ ions were prepared at 130°C based on precipitation method in glycerol medium. The interaction between GaPO 4 nanoparticles and Eu 3+ ions has been investigated using Eu 3+ luminescence and 31 P magic angle spinning nuclear magnetic resonance (MAS NMR) techniques. Based on these studies, it is established that Eu 3+ ions up to 2.5 at.% replace the protons of the hydroxyl groups attached on Ga 3+ ions present on the surface of the nanoparticles and above 2.5 at.%, a separate EuPO 4 phase is formed. The anisotropy parameters derived from the side band intensities of the 31 P MAS NMR patterns from these samples confirmed the surface ion exchange at low Eu 3+ concentration (2.5 at.%) and EuPO 4 phase formation at high Eu 3+ concentration (5 at.% and more). The increase in anisotropy at high Eu 3+ contents has been attributed to the presence of paramagnetic EuPO 4 phase.