Preparation of three-dimensional symmetric dendrites of BaWO4 microcrystals

Three‐dimensional symmetric dendrites of BaWO4 were prepared by performing solvothermal reactions in water‐hexane bilayer solutions that contained a barium‐oleate complex in the hexane layer and sodium tungstate in the water layer. The barium‐oleate complex in hexane was obtained via a phase transfe...

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Bibliographic Details
Published in:Crystal research and technology (1979) 2015-04, Vol.50 (4), p.284-288
Main Authors: Jung, Hye-Yun, Huh, Young-Duk
Format: Article
Language:English
Subjects:
crystal growth
dendrite
morphology
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Summary:Three‐dimensional symmetric dendrites of BaWO4 were prepared by performing solvothermal reactions in water‐hexane bilayer solutions that contained a barium‐oleate complex in the hexane layer and sodium tungstate in the water layer. The barium‐oleate complex in hexane was obtained via a phase transfer reaction in which aqueous Ba2+ ions pass into the hexane phase with the assistance of sodium oleate, oleic acid, and oleylamine. Each of the BaWO4 dendrites has a three‐dimensional structure with one trunk along the c‐axis and a series of four branches perpendicular to the trunk. As the reaction temperature or the amount of oleylamine increases, BaWO4 dendrites with sharper branches and higher order hierarchical structures are formed. The presence of oleylamine plays an important role in the formation of the hierarchical superstructures of BaWO4 dendrites. We report the synthesis of three‐dimensional symmetric dendrites of BaWO4. The dendrite of BaWO4 consists of a trunk along the c‐axis. A series of four branches perpendicular to the trunk is formed. Highly branched structures of BaWO4 are formed in kinetically controlled reactions.
ISSN:0232-1300
1521-4079
DOI:10.1002/crat.201400310