Crystal structures of Na(1/2)Ln(1/2)TiO(3) (Ln : La, Eu, Tb)
Journal of Solid State Chemistry 180(3): 995-1001
Neutron powder diffraction studies of Na1/2La1/2TiO3 and Na1/2Tb1/2TiO3, and a synchrotron X-ray powder diffraction study of Na1/2Eu1/2TiO3 have been carried out. Rietveld refinement of the structures confirmed that Na1/2Eu1/2TiO3 and Na1/2Tb1/2TiO3 crystallizes in GdFeO3 type of structure (space group Pbnm). The ambiguity in the literature regarding the crystal structure of Na-1/2 La1/2TiO3 has been resolved and the correct space group is found to be R3c. A detailed list of refined structural parameters of these compounds is presented for the first time. (c) 2007 Elsevier Inc. All rights reserved.