Barium holmium niobate Ba2HoNbO6 (BHNO) has been developed as a new substrate for (Bi,Pb)2Sr2Ca2Cu3Ox (Bi(2223)) superconductor film. Ba2HoNbO6 has a cubic perovskite structure with lattice constant a = 8·26 Å. The dielectric constant and loss factor of this material are in a range suitable for its use as a substrate for microwave applications. The Bi(2223) superconductor shows no detectable chemical reaction with BHNO, even under extreme processing conditions. Dip coated Bi(2223) thick film on Ba2HoNbO6 substrate had T c(0) of 109 K and current density of around 4 × 103 A cm - 2 at 77 K and in zero magnetic field.
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