Journal
JOURNAL OF CRYSTAL GROWTH
Volume 290, Issue 1, Pages 296-300Publisher
ELSEVIER
DOI: 10.1016/j.jcrysgro.2006.01.012
Keywords
crystal morphology; hydrothermal crystal growth; NaYF4
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Cubic nano-spheres and hexagonal microprisms of sodium yttrium tetrafluoride (NaYF4) have successfully been prepared separately via a mild hydrothermal route. The morphology and the structure of the NaYF4 crystals can be changed by adjusting the Y3+/F- ratio in the reaction solution. Cubic NaYF4 nano-spheres are synthesized when the Y3+/F- ratio is stoichiometric; while hexagonal NaYF4 microprisms appear as excess F- is present at 180 degrees C for more than 5 h. Ethylenediamine tetra-acetic acid (EDTA) plays an important role as a chelating ligand, and F- acts as both a reactant and a mineralizer during the synthesis process. A growth mechanism is discussed. (c) 2006 Elsevier B.V. All rights reserved.
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