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Luminescence and EPR studies of YBO(3):U

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Title Luminescence and EPR studies of YBO(3):U
 
Creator SESHAGIRI, TK
MOHAPATRA, M
RAO, TKG
KADAM, RM
NATARAJAN, V
GODBOLE, SV
 
Subject electron-paramagnetic-resonance
crystal
uranium
spectroscopy
irradiation
efficiency
centers
inorganic compounds
defects
epr
luminescence
 
Description Yttrium borate doped with uranium was prepared by mixing and heating yttrium oxide obtained through oxalate precipitation route, boric acid and requisite amount of nuclear-grade uranium oxide at high temperature. Photoluminescence (PL), thermally stimulated luminescence (TSL) and electron paramagnetic resonance (EPR) studies were carried out on gamma-irradiated doped/undoped yttrium borate samples in the temperature range 300-600K. TSL studies showed the presence of two glow peaks at 414 and 471 K. PL studies along with lifetime decay investigation suggested uranium goes in the matrix as UO(2)(2+). EPR studies showed the presence of O(2)(-)radical ion along with electron trapped in defect centres, which might have been produced for charge compensation. Apart from this, CO(2)(-) radical was also observed in the system having its origin from residual oxalate ion. Temperature dependence EPR studies of the observed radical confirmed the involvement of the CO(2)(-) and dioxide radical ion in the observed glow peaks. By correlating the TSL, PL and ESR data, probable mechanism is proposed for the observed TSL glow in the system. (C) 2009
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-25T11:50:04Z
2011-12-26T12:57:03Z
2011-12-27T05:46:48Z
2011-08-25T11:50:04Z
2011-12-26T12:57:03Z
2011-12-27T05:46:48Z
2009
 
Type Article
 
Identifier JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 70(9), 1261-1266
0022-3697
http://dx.doi.org/10.1016/j.jpcs.2009.07.011
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11011
http://hdl.handle.net/10054/11011
 
Language en