The existence of the orthorhombic(II) phase in the YBa2Cu3O7-δ system is derived by a model calculation of the oxygen order-disorder transformation on the Cu(1) plane. The repulsion interaction energy between the second-nearest-neighboring oxygen atoms contributes to the occurrence of the orthorhombic(I)-orthorhombic(II) transformation while the first-nearest interaction gives rise to the tetragonal-orthorhombic(I) transformation. The structure of the orthorhombic(II) phase is considered to be an alternately-ordered state of the oxygen atoms within the a-axis site.
No takes yet. Share an insight, caveat, or question.
Kubo et al. (1987) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: