A group of complex perovskite oxides Ba2RENbO6 (RE = Yb, Er and Ho) have been synthesised and developed for their use as substrate for YBa2Cu3O7-δ superconductors. These materials have a complex cubic perovskite ( A2BB′O6 ) structure with lattice constants, a=8.3–8.5 Å. Ba2RENbO6 did not show any phase transition in the temperature range 30–1100°C. The dielectric constant and loss factor of Ba2RENbO6 are in the range suitable for their use as substrate for microwave applications. YBa2Cu3O7-δ superconductors did not show any detectable chemical reaction with Ba2RENbO6 even under extreme processing conditions. Dip-coated YBa2Cu3O7-δ thick films on polycrystalline Ba2RENbO6 substrate gave a T c (0) of 92 K and a current density of ~ 1.2 × 104 A cm-2.
Noble‐Metal‐Assisted Fast Interfacial Oxygen Migration with Topotactic Phase Transition in Perovskite Oxides
