Additional Oxygen Ordering in "La2NiO4.25" (La8Ni4O17): I. Electron and Neutron Diffraction Study

摘要: A new material with the composition La[sub 2]NiO[sub 4.25] exhibiting a large additional oxygen amount respect to K[sub 2]NiF[sub 4]-type structure has been prepared using an electrochemical process. monoclinic unit cell (C-centered) determined by TEM. This is four times bigger than average orthorhombic and refined parameters are = 13.832 [angstrom], b 10.930 c 10.912 [beta] 113.31[degrees]. The from neutron powder-diffraction data at 300 9 K. space group C2. In this site of atoms fully occupied.