The structure in a wide oxygen-deficiency range of Ba2YCu3O7-X crystal (0.15<X<0.78) prepared by a quenching method was examined by electron optical methods. The crystal structure modification for the ortho-II phase (T c∼60 K, X∼0.5), whose shorter a-axis is doubled, is considered to be an ordered oxygen-vacancy arrangement caused by removing oxygen atoms from alternating oxygen atoms and their vacancy arrays along the [010] direction on Cu(1)-plane. The mechanism for the ortho-I →the ortho-II →the “incipient” tetragonal phase transformation is discussed in terms of oxygen-deficiency.
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Ichihashi et al. (1988) studied this question.
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