Synthesis of Sr- and Fe-doped LaGaO3 perovskites by the modified citrate method |
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Authors: | J Yuenyongchaiwat S Tantayanon Jidong Lou Yi Hua Ma |
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Affiliation: | (1) Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand |
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Abstract: | Fine particle strontium and iron substituted lanthanum gallates La1–x
Sr
x
Ga1–y
Fe
y
O3–, where x = 0.2, 0.4, and 0.6; y = 0.2, 0.4, 0.6, and 0.8, have been synthesized by a modified citrate method. The formation of these powders was confirmed by the X-ray powder diffraction (XRD) and the fine particle of La0.6Sr0.4Ga0.2Fe0.8O3– was investigated by scanning electron microscopy (SEM), and particle size analysis. The single phase of La0.8Sr0.2Ga0.4Fe0.6O3–, La0.6Sr0.4Ga0.2Fe0.8O3–, and La0.4Sr0.6Ga0.2Fe0.8O3– powders could be obtained both with and without calcination. The amount of the secondary phase increased when the amount of Sr in La1–x
Sr
x
Fe0.6Ga0.4O3– was more than 0.2 (x > 0.2) and the amount of Fe in La0.6Sr0.4Ga1–y
Fe
y
O3– and La0.4Sr0.6Ga0.2Fe0.8O3– was less than 0.8 (y < 0.8). The results indicated that in the pH range of 1.36–9.27, the single phase of La0.6Sr0.4Ga0.2Fe0.8O3– was formed without calcination and the pH had negligible effects on the structure and lattice parameter. The fine particle of these calcined powders (<4 m) was obtained with the average particle size 1.70 m at pH = 1.36 and with the average particle size between 0.56–0.60 m at pH range between 3.39–9.27, and with a lattice parameter about 3.9 Å. |
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