Crystallization kinetics of lanthanum monoaluminate (LaAlO3) nanopowders prepared by co-precipitation process |
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| Authors: | Chia-Liang Kuo Yen-Hwei Chang Moo-Chin Wang |
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| Affiliation: | 1. Department of Materials Science and Engineering, National Cheng Kung University, 1 Ta-Hsueh Road, Tainan 70101, Taiwan;2. Faculty of Fragrance and Cosmetics, Kaohsiung Medical University, 100 Shih-Chuan 1st Road, Kaohsiung 807, Taiwan |
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| Abstract: | Lanthanum monoaluminate (LaAlO3) nanopowders were synthesized using La(NO3)3·6H2O and Al(NO3)3·6H2O as starting materials by a co-precipitation method. The crystallization kinetics of the LaAlO3 nanopowders has been investigated by using differential thermal analysis (DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and selected area electron diffraction (SAED). The XRD results and SAED patterns show that the rhombohedral LaAlO3 nanopowders have been obtained when the precipitates as calcined at 1092 K for 10 min. The activation energy for the crystallization of the rhombohedral LaAlO3 nanopowders is determined as 286.75 kJ/mol by a non-isothermal method. The TEM examination shows that the rhombohedral LaAlO3 has a spherical morphology with the size ranging from 30 to 50 nm. |
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| Keywords: | Crystallization kinetics Lanthanum monoaluminum Co-precipitation method Thermal analysis |
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