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http://hdl.handle.net/2080/719
Title: | Phase evolution in gel-precipitated LaAlO3 ceramics |
Authors: | Behera, S K Sahu, P K Pratihar, S K Bhattacharyya, S |
Keywords: | Oxides Chemical synthesis; Infrared spectroscopy Thermogravimetric analysis (TGA); X-ray diffraction |
Issue Date: | 2008 |
Publisher: | Elsevier |
Citation: | Journal of Physics and Chemistry of Solids, Vol 69, Iss 8,P 2041-2046 |
Abstract: | Lanthanum aluminate ceramic powders could be prepared by a combined gel precipitation process from metal chlorides using ammonia. A slight modification in the conventional gel precipitation technique was carried out by introducing a step of ultrasonication followed by centrifugal washing of the gel. The dried gels produced pure phase lanthanum aluminate powders on calcination at 1100 °C for the combined gel-precipitated powders, and at 600 °C for the washed gel. The phase evolution was studied and it was found that the delay in obtaining monophasic LaAlO3 in the combined gel-precipitated powder owed to the crystallization of an impure phase LaOCl. This phase was not detected in the washed gel (WG) powders. TEM micrographs showed a uniform morphology for the calcined WG powders, which were in contrast to the irregular particles in the gel-precipitated (GP) powders. The uniform morphology was assigned to the ultrasonic effects during washing of the gel. |
Description: | Copyright for the paper belongs to Elsevier |
URI: | http://dx.doi.org/10.1016/j.jpcs.2008.02.019 http://hdl.handle.net/2080/719 |
Appears in Collections: | Journal Articles |
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