Ordering and Decomposition in the High-Temperature Superconducting Compound YBa2Cu3Ox

A. G. Khachaturyan; J. W. Morris, Jr.

doi:10.1103/PhysRevLett.59.2776

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Ordering and Decomposition in the High-Temperature Superconducting Compound YBa2Cu3Ox

A. G. Khachaturyan, J. W. Morris, Jr.

DOI 10.1103/PhysRevLett.59.2776 · Physical Review Letters

T1

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Abstract

The method of concentration waves is applied to structural transformations in superconducting Y-Ba-Cu oxide. The method predicts an ordering reaction that results in a tetragonal-to-orthorhombic phase transformation, and also yields the correct structure of the YBa2Cu3O7 orthorhombic ordered phase. The results suggest that at low temperature the off-stoichiometric orthorhombic phase is thermodynamically unstable with respect to secondary decomposition into a mixture of ordered orthorhombic and disordered tetragonal phases, whose microstructure can be anticipated.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown