Abstract
The combinative energy in the YBa 2Cu 3O 7−δ with the different δ value, from 0.07 to 0.62, was calculated based on two-block model. In order to compensate for the deficiency of the ionic model for the YBa 2Cu 3O 7−δ, some holes were directly put on the different planes in the YBa 2Cu 3O 7−δ. When the holes are on the Cu(2)O plane, the calculated result is perfectly consistent with the fact that the carriers mainly concentrate on the Cu(2)O plane. When the holes are on the Cu(1)O plane, The combinative energy shows the same trend as that on the Cu(2)O plane, but the plateau in the range of δ ∼ 0.35 – 0.55 is different. When the holes are on the BaO plane, the relationship between the combinative energy and the oxygen deficiency is ambiguous. The calculation of the holes on different planes supplies abundant information about the charge distribution in the YBa 2Cu 3O 7−δ.
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