Zr and Ti have been substituted in the system Y1−xMxBa2Cu3O7−δ(M=Zr, Ti,x=0.05,0.1). We find that theTc value is unchanged, ∼90K for Zr substitutions up to 10% and in the case of Ti substitutions theTc drops significantly. These changes may arise from their site preference.
High temperature superconductivity tetravalent substitution YBa2Cu3O7−δ
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