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http://nopr.niscpr.res.in/handle/123456789/14366| Title: | Effect of glycine concentration on the properties of LaCoO3 perovskite prepared by the glycine-nitrate process |
| Authors: | Kondakindi, Rajender R |
| Keywords: | Glycine-nitrate process;Perovskites;Mixed oxides;Lanthanum cobaltate;Surface area;Particle size |
| Issue Date: | Jul-2012 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | LaCoO3 nanocrystals have been prepared by the glycine-nitrate process. The effect of glycine content in the synthesis solution on various properties of LaCoO3 has been studied in the glycine-to-nitrate molar ratio between 0.75 and 2.0. The samples are characterized by X-ray diffraction for phase purity and particle size, by transmission electron microscopy for particle size, by BET for surface area and by temperature-programmed reduction for reducibility of Con+. XRD reflections show the presence of impurities in the as-prepared samples while only rhombohedral phase could be identified in the samples after calcination at 700 °C. For all the glycine-to-nitrate ratios tested, the particle size estimated from XRD data ranges from 58-69 nm, which are systematically lower than those determined by BET which ranged from 97-118 nm. TPR profiles of the samples show two major peaks; one due to the reduction of Co3+ to Co2+ and the other due to the reduction of Co2+ to Co0. The samples prepared under fuel-deficient and fuel-rich conditions show higher reducibility as compared to that of the sample prepared under stoichiometric conditions. |
| Page(s): | 931-936 |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Appears in Collections: | IJC-A Vol.51A(07) [July 2012] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJCA 51A(7) 931-936.pdf | 1.82 MB | Adobe PDF | View/Open |
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