Structural Studies of the Destruction of Cu-0 Chains in PrBa2Cu3O7 by Ga-doping

J. C. Peng.；W. T. Hsieh；K. C. Lee；W. -H. Li；H. D. Yang

Chinese Journal of Physics

36卷2期（1998 / 04 / 01）

72 - 84

英文

Structural changes of the PrBa2Cu3O7 compound as Cu are partially replaced by Ga or Zn are studied by using high resolution neutron diffraction measurements. Rietveld method is followed in refining the diffraction patterns. Ga atom is found to enter the Cu site in the CuO-chain layers, that also causes the 0 in that layer to become disorder with equal probability to occupy the sites along the a and along the b axis directions. This effectively destroys the Cu-0 chain ordering observed in the undoped system, and results in (Cu/Ga)-0c alns run in both the a and b axis directions. Tetragonal symmetry for the Ga-doped compound is resulted. Zn atom, on the other hand, replaces the Cu in the CuO2-plane layer, which make no significant effect on the basic structure except a small oxygen disorder in the chain layers. The bond lengths of Pr and the 0 in the CuO2-plane layers increase slightly in the Ga-doped system, whereas that in the Zn-doped system remains basically unaffected.

1. 張繼豪(2011)。新穎先進的金屬防蝕塗料：仿生超疏水高分子以及氣體阻隔聚苯胺／類石墨烯複合材料。中原大學化學系學位論文。2011。1-260。