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why compound YBa2Cu3O7 is black and a super conductor but YBa2Cu3O5 is green and an insulator?

why compound YBa2Cu3O7 is black and a super conductor but YBa2Cu3O5 is green and an insulator?

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and are ceramic superconductors. They are called as perovskites. Perovskites are metal oxides containing several different metals.

contains yttrium(Y), barium(Ba) and copper(Cu). The three metals are present in 1:2:3 mole ratio. Thus, for making , three chemical compounds containing yttrium, barium and copper are mixed in the proportions such that these metals are in the ratio of 1:2:3. The mixture is heated in the presence of oxygen. The resulting metal oxide is black and is a superconductor. If the metal oxide is short on oxygen, it will be green and will not be a superconductor.

is short on oxygen and hence it is green. It is not a superconductor. It is an insulator. Removal of oxygen destroys the copper chains in the structure which are crucial to the formation of superconducting state.

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