Structural chemistry of A(3)CuBO(6) (A = Ca, Sr; B=Mn, Ru, Ir) as a function of temperature

Aldridge, A.S.; Battle, P.D.; Evans, J.S.O.; Moore, C.A.; Prior, T.J.; Wiseman, P.J.

Abstract

Variable temperature X-ray and neutron powder diffraction techniques have been used to identify structural phase transitions in Cu-rich A(3)A'BO6 phases. A transition from monoclinic to rhombohedral symmetry was observed by X-ray diffraction between 700 and 500 K in Sr3Cu1-xMxIrO6 (M = Ni, Zn; 0 less than or equal to x less than or equal to 0.5). The temperature of the phase change decreased in a linear manner with Cu-content and was essentially independent of the nature of M. Ca3.1Cu0.9MnO6 was shown to pass from a rhombohedral phase to a triclinic phase on cooling below 290 K; the structure of the triclinic phase was refined against neutron diffraction data collected at 2 K. Ca3.1CU0.9RuO6 undergoes a transition between a disordered rhombohedral phase and an ordered monoclinic phase when cooled below 623 K. Neutron diffraction has been used to determine the structure as a function of temperature in the range 523 less than or equal to T/K less than or equal to 723 and hence to determine an order parameter for the low temperature phase; the second-order transition is shown to be incomplete 100 K below the critical temperature.

Citation

Aldridge, A., Battle, P., Evans, J., Moore, C., Prior, T., & Wiseman, P. (2005). Structural chemistry of A(3)CuBO(6) (A = Ca, Sr; B=Mn, Ru, Ir) as a function of temperature. Inorganic Chemistry, 44(2), 197-205

• Journal Article Type: Article
• Publication Date: 2005-01
• Journal: Inorganic Chemistry
• Print ISSN: 0020-1669
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 44
• Issue: 2
• Pages: 197-205