a1 Department of Environmental and Materials Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
a2 Photocatalytic Material Center, National Institute for Materials Science (NIMS), Ibaraki 305-0047, Japan
a3 Department of Chemistry, Graduate School of Science, Hokaido University, Sapporo 060–0808, Japan
The crystal structure of Li2LaTa2O6N was determined from laboratory X-ray powder diffraction data (Cu Kα1) using the Rietveld method. The title compound is tetragonal with space group I4/mmm, Z=2, and unit-cell dimensions a=0.395 049(4) nm, c=1.850 97(3) nm, and V=0.288 869(6) nm3. The initial structural model was successfully derived by the direct methods and further refined by the Rietveld method, with the anisotropic atomic displacement parameters being assigned for all atoms. The final reliability indices were Rwp=5.73%, S=1.46, Rp=4.33%, RB=1.13%, and RF=0.53%. Li2LaTa2O6N has a layered perovskite structure similar to that of Li2LaTa2O7.
(Received October 04 2010)
(Accepted November 30 2010)