Triclinic Ni0.6Co0.4TiO3 Ilmenite Oxide
  Forming a solid-solution of NiTiO3 and CoTiO3, two isostructural (ilmenite) and isosymmetrical (space group R-3) compounds, result in a single-phase compound with a remarkably low crystal symmetry. By neutron and X-ray synchrotron powder diffraction techniques, the space group symmetry of the Ni0.6Co0.4TiO3 sample was found to be triclinic P-1 at room temperature, far above the magnetic transition temperature. Ni and Co ions were found to prefer positions close to the octahedron center, whereas Ti ions took off-center positions. This structural distortion is the first known case in ilmenites and opens up ways to modify functional properties of magnetic oxides. Origin of the symmetry lowering is discussed. 
Yukari Fujioka, Johannes Frantti, Anna Llobet, Graham King, and Steven   N. Ehrlich
cond-mat.mtrl-sci