Synthesis, thermal characterization and local structure studies of Gd doped Th0.7U0.3O2 using X-ray absorption spectroscopyElectronic supplementary information (ESI) available. See DOI: 10.1039/c6ra07621a
(Th 0.7− x U 0.3 Gd x )O 2+ y microspheres where x = 0, 0.05, 0.10 and 0.15 were prepared by internal gelation method. Good quality translucent microspheres of size ∼1.70 to 2.0 mm were obtained when low metal ([M]) and high [hexamethylenetetramine + urea]/[M] ( R ) concentration was used. The solid...
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Main Authors | , , , , , , , , |
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Format | Journal Article |
Published |
01.07.2016
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Online Access | Get full text |
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Summary: | (Th
0.7−
x
U
0.3
Gd
x
)O
2+
y
microspheres where
x
= 0, 0.05, 0.10 and 0.15 were prepared by internal gelation method. Good quality translucent microspheres of size ∼1.70 to 2.0 mm were obtained when low metal ([M]) and high [hexamethylenetetramine + urea]/[M] (
R
) concentration was used. The solid solutions prepared from these microspheres were subjected to thermal expansion studies which showed a gradual decrease in thermal expansion coefficient values with increase in Gd ion concentration. Specific heat capacities of mixed oxides were measured from 300 to 850 K and showed that the temperature dependence of the heat capacities of Gd doped samples is similar to that of the un-doped sample. The local structure studies by EXAFS showed that Gd-O, Gd-Th and longer Gd-O paths are similar to Th-O, Th-Th and longer Th-O path lengths. EXAFS studies showed higher oxygen coordination in the case of the 10% Gd substituted sample compared to the other samples.
(Th
0.7−
x
U
0.3
Gd
x
)O
2+
y
microspheres where
x
= 0, 0.05, 0.10 and 0.15 were prepared by internal gelation method. |
---|---|
Bibliography: | 10.1039/c6ra07621a Electronic supplementary information (ESI) available. See DOI |
ISSN: | 2046-2069 |
DOI: | 10.1039/c6ra07621a |