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Journal Article

Effect of the crystal structure of small precursor particles on the growth of β-NaREF4 (RE = Sm, Eu, Gd, Tb) nanocrystals.

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Uhl,  A.
Biomedical NMR Research GmbH, MPI for biophysical chemistry, Max Planck Society;

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Citation

Voß, B., Nordmann, J., Uhl, A., Komban, R., & Haase, M. (2013). Effect of the crystal structure of small precursor particles on the growth of β-NaREF4 (RE = Sm, Eu, Gd, Tb) nanocrystals. Nanoscale, 5, 806-812. doi:10.1039/C2NR33083K.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-CA67-1
Abstract
The origin of the narrow particle size distributions obtained in the oleic acid-based synthesis of hexagonal phase β-NaREF4 nanocrystals (RE = Sm, Eu, Gd, Tb) has been investigated. Compared to the standard synthesis, the growth conditions were simplified by using small purified particles of either α-NaREF4 (cubic phase) or β-NaREF4 (hexagonal phase) as single-source precursors, thereby avoiding the complications arising from the simultaneous presence of molecular educts and intermediately formed small particles. The study shows that α-phase as well as β-phase particles grow by Ostwald-ripening but narrow particle size distributions of the β-NaREF4 product particles are only obtained when α-phase precursor particles are employed. Since the small particles are also formed as intermediate products in the standard synthesis of β-NaSmF4, β-NaEuF4, β-NaGdF4 and β-NaTbF4 particles, their crystal phase is an important parameter to obtain a narrow size distribution in these systems.