Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 357, Issue 3, Pages 1172-1176Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2010.10.019
Keywords
La-doped SnO2; Nanopowder; Mono layer dispersion; Chemical co-precipitation
Funding
- Science and Technology Department of Shannxi of China [2007K06-09]
- Education Office, Shannxi of China [09JK446, 07JK259]
- National Natural Scientific Foundation of China [51002113]
- Science and Technology of Xi'an Polytechnic University of China [2010JC10]
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A series of La-doped SnO2 nanopowders with various dopant concentrations were prepared by chemical co-precipitation technique, and the nanopowders prepared were characterized by differential scanning calorimeter (DSC), thermo-gravimetric (TG), X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The results show that La doping can obviously prevent the growth of nanosized SnO2 crystallites. When the La concentration reaches and surpasses 5 at.%, SnO2 crystallite size reaches a minimum value and remains almost constant. With the increase of La concentration, La tends to dissolve in the bulk phase of SnO2 to form solid solution below 10 at.% addition and then starts to disperse onto the surface of the solid solution as a monolayer above 10 at.%. The effect of La doping on hindering crystallite growth can be attributed to the solute drag and lattice distortion resulting from La dissolving in the bulk phase of SnO2 to form solid solution, rather than the monolayer of La on the surfaces of the SnO2 powders. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.
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