32746-31-9Relevant academic research and scientific papers
Electronically Driven Structural Distortions in Lithium Intercalates of the n = 2 Ruddlesden-Popper-Type Host Y2Ti2O 5S2: Synthesis, Structure, and Properties of Li xY2Ti2O5S2 (0 < x < 2)
Hyett, Geoffrey,Rutt, Oliver J.,Gal, Zoltan A.,Denis, Sophie G.,Hayward, Michael A.,Clarke, Simon J.
, p. 1980 - 1991 (2004)
Lithium intercalation into the oxide slabs of the cation-deficient n = 2 Ruddlesden-Popper oxysulfide Y2Ti2O5S 2 to produce LixY2Ti2O 5S2 (0 2Ti2O5S2, the tetragonal symmetry of the host is retained: Li0.99(5)Y2Ti 2O5S2, I4/mmm, a = 3.80002(2) A, c = 22.6396(2) A, Z = 2. The lithium ion occupies a site coordinated by four oxide ions in an approximately square planar geometry in the perovskite-like oxide slabs of the structure. At higher levels of lithium intercalation, the symmetry of the cell is lowered to orthorhombic: Li0.99(5)Y 2Ti2O5S2, Immm, a = 3.82697(3) A, b = 3.91378(3) A, c = 22.2718(2) A, Z = 2, with ordering of Li+ ions over two inequivalent sites. At still higher levels of lithium intercalation, tetragonal symmetry is regained: Li 1.52(5)Y2Ti2O5S2, I4/mmm, a = 3.91443(4) A, c = 22.0669(3) A, Z = 2. A phase gap exists close to the transition from the tetragonal to orthorhombic structures (0.6 a cooperative electronically driven Jahn-Teller type distortion. Magnetic susceptibility and resistivity measurements are consistent with metallic properties for x > 1, and the two-phase region is identified as coincident with an insulator to metal transition.
