Conducting properties and structure of nonstoichiometric orthorhombic phase of YBa2Cu3O7−x obtained by high-temperature vacuum annealing
I. KhidirovInstitute of Nuclear Physics, Academy of Sciences of the Republic of Uzbekistan, TashkentВ. Т. ЭмInstitute of Nuclear Physics, Academy of Sciences of the Republic of Uzbekistan, TashkentN. N. MukhtarovaInstitute of Nuclear Physics, Academy of Sciences of the Republic of Uzbekistan, TashkentAbdulla RakhimovInstitute of Nuclear Physics, Academy of Sciences of the Republic of Uzbekistan, Tashkent
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Annotatsiya
Neutron and x-ray diffraction studies are carried out which show when the orthorhombic phase of YBa2Cu3O7−x (x≈0.02) is heat treated at temperatures of 430–550 K under tunnel high-vacuum pumping, a partial emission of oxygen from the O(1) positions (with coordinates 0;0;0.1578) and O(4) positions (with coordinates 0;1/2;0) occurs with no change in the symmetry or in the unit cell parameters. The temperature dependence of the electrical resistivity in the temperature interval 77–300 K shows a semiconducting character.
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