Growth mechanism of octahedron-like BaMoO4 microcrystals processed in microwave-hydrothermal: Experimental observations and computational modeling
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Data
2009-10-01
Autores
Cavalcante, Laecio Santos
Sczancoski, Julio Cesar
Tranquilin, Rircado Luis
Varela, José Arana [UNESP]
Longo, Elson [UNESP]
Orlandi, Marcelo Ornaghi [UNESP]
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Editor
Elsevier B.V.
Resumo
Octahedron-like BaMoO4 microcrystals were synthesized by the co-precipitation method at room temperature and processed in microwave-hydrothermal at 413 K for different times (from 30 min to 5 h). These microcrystals were analyzed by X-ray diffraction (XRD), field-emission gun scanning electron microscopy (FEG-SEM) and transmission electron microscopy (TEM). XRD patterns showed that this material presents a tetragonal structure without the presence of deleterious phases. FEG-SEM and TEM micrographs revealed that the BaMoO4 microcrystals present an octahedron-like morphology with agglomerate nature and poly-disperse particle size distribution. These micrographs also indicated that the microcrystals grow along the [001] direction. The observed crystallographic planes in these structures were modeled computationally and a crystal growth model was proposed in order to explain the morphological changes as a function of processing time. (C) 2009 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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BaMoO4, Growth process, Microwave-hydrothermal, Supersaturated solution
Como citar
Particuology. New York: Elsevier B.V., v. 7, n. 5, p. 353-362, 2009.