Synthesis and Characterization of Rare-Earth Barium Antimonates, a New Group of Complex Perovskites Suitable as Substrates for YBa2Cu3O7-δ Films

• Published in: Journal of solid state chemistry Vol. 116; no. 1; pp. 193 - 198
• Main Authors: Kurian, J., Koshy, J., Wariar, P.R.S., Yadava, Y.P., Damodaran, A.D.
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 01-04-1995; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cuprates superconductors (high tc and insulating parent compounds); Exact sciences and technology; High-Tc compounds; Physics; Properties of type I and type II superconductors; Structure of solids and liquids; crystallography; Superconductivity; Transport properties (electric and thermal conductivity, thermoelectric effects, etc.); X-ray absorption spectroscopy: exafs, nexafs, xanes, etc; X-ray diffraction and scattering; Y-based cuprates; Samarium oxides; Inorganic compounds; Transition element compounds; Antimony oxides; Perovskites; XRD; Rare earth compounds; Experimental study; Substrates; Gadolinium oxides; Synthesis; Praseodymium oxides; Barium oxides; Quaternary compounds; Permittivity; Copper oxides; Yttrium oxides; Electric conductivity; Crystal structure
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1006/jssc.1995.1201

A new group of complex perovskites, REBa2SbO6 (where RE = Pr, Sm, and Gd), have been synthesized and sintered as single phase materials by the solid state reaction method. These materials are found to be isostructural and to have a complex cubic perovskite structure. X-ray diffraction and resistivity measurements have shown that there is no detectable chemical reaction between YBa2Cu3O7-δ and RE Ba2SbO6 even under severe heat treatment at 950°C and that the addition of REBa2SbO6 up to 20 vol% in YBa2Cu3O7-δ shows no detrimental effect on the super-conducting properties of YBa2Cu3O7-δ. The dielectric constant and loss factor values of the sintered REBa2SbO6 materials are in a range suitable for their use as substrates for microwave applications. Thick films of YBa2Cu3O7-delta; fabricated on polycrystalline REBa2SbO6 substrates give superconducting zero resistivity transition temperature Tc(0) = 92 K, indicating the suitability of these materials as substrates for YBa2Cu3O7-δ films.