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Title: Single crystal growth of apatite-type Al-doped neodymium silicates by the floating zone method
Authors: An, Tao
Baikie, Tom
Wei, Fengxia
Li, Henan
Brink, Frank
Wei, Jun
Ngoh, Shwu Lan
White, Timothy John
Kloc, Christian
Keywords: Crystal structure
Floating zone technique
Issue Date: 2011
Source: An, T., Baikie, T., Wei, F., Li, H., Brink, F., Wei, J., et al. (2011). Single crystal growth of apatite-type Al-doped neodymium silicates by the floating zone method. Journal of Crystal Growth, 333(1), 70-73.
Series/Report no.: Journal of Crystal Growth
Abstract: Lanthanoid silicates (Ln9.33Si6O26) adopt the hexagonal apatite structure and show potential as solid oxide fuel cell (SOFC) electrolytes due to their high oxide ion conductivity at intermediate temperatures (500–700 °C). Ions migrate preferentially along the crystallographic c-axis, and can be improved by introducing lower valent elements at the silicon sites. To better understand this phenomenon, single crystals of aluminium-doped neodymium silicate Nd9.33+x/3AlxSi6−xO26 (0≤x≤1) were synthesised using the floating-zone method in an inert environment at a growth rate of 5 mm/L. The products with x<1.5 were homogeneous, transparent and crack-free crystals. For x=1.5 the monophasic crystal contained minor cracks after cooling and for x=2 a two phase (apatite+NdAlO3) polycrystalline mass was obtained. The quality of the 0≤x≤1.5 crystals were confirmed by neutron diffraction and synchrotron X-ray rocking curve diffraction. The incorporation of aluminium into apatite at nominal concentrations was independently established by energy dispersive X-ray spectroscopy (EDX), and electron backscatter diffraction (EBSD) found the crystallographic habit showed extension along [001].
ISSN: 0022-0248
DOI: 10.1016/j.jcrysgro.2011.08.010
Rights: © 2011 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Crystal Growth, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
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