Ba₂NdZrO_5.5 as a potential substrate material for YBa₂Cu₃O_7‐δ superconducting films

Abstract

The new oxide Ba 2 NdZrO 5.5 (BNZO) has been produced by the standard solid state reaction method. Xray diffraction analysis (XRD) revealed that this synthesized material has an ordered complex cubic perovskite structure characteristic of A 2 BB'O 6 crystalline structure with a lattice parameter of a=8.40 Å. It was established through EDX analysis that there is no trace of impurities. Chemical stability of BNZO with YBa 2 Cu 3 O 7-δ (YBCO) has been studied by means of Rietveld analysis of experimental XRD data on several samples of BNZO-YBCO composites. Quantitative analysis of phases on XRD patterns show that all peaks have been indexed for both BNZO and YBCO, and no extra peak is detectable. YBCO and BNZO remain as two different separate phases in the composites with no chemical reaction. Electrical measurements also revealed that superconducting transition temperature of pure YBCO and BNZO-YBCO composites is 90 K. These favorable characteristics of BNZO show that it can be used as a potential substrate material for deposition of YBCO superconducting films.

Structural and magnetic properties of YBa2Cu3O7/BaZrO3 composites

“…For chemical stability studies, a single-phase YBCO superconductor was prepared by solid-state synthesis 10 . 50%, 70% and 90% vol% of BZO were mixed in YBCO superconductor powder (50/50, 30/70 and 10/90) and the mixture was pressed into circular discs (10 mm diameter, 1 mm thickness) at a pressure of 5 ton/cm 2 …”

“…The complex cubic perovskite oxides have been investigated for their use as potential new substrates for the production of cuprate superconducting films 1,2 . For good quality substrates, the material candidate must satisfy the following requirements: chemical stability, e. g., absence of chemical reaction at the interface substrate-film; good lattice parameter coupling at the crystallographic plane substrate-film to guarantee the epitaxial growth; and the presence of the substrate material must not affect the superconducting properties of the film 3 .…”

Electrical Transport and Lowered Percolation Threshold in YBa2Cu3O7−δ-Nano-YBa2ZrO5.5 Composites

“…In order to confirm their chemical compatibility with YBCO, it is important to study the electrical transport and percolation behavior in these superconductor-insulator composites. Transport properties and percolation behavior of high superconductor-metal composites have been reported extensively [19][20][21][22][23][24]. The general form of the double perovskites is A 2 BB O 6 , where for the present work A = Ba, B = Y, and B = Zr.…”

Development, characterization, sintering, dielectric and optical properties of NdBa2ZrO5·5 nanocrystals

“…In view of their chemical stability, synthesis of NdBa 2 ZrO 5·5 , a complex perovskite oxide, has been investigated for possible applications as substrates for high T C superconductors (HTS) and in these investigations, NdBa 2 ZrO 5·5 was synthesized through solid state route (Tovar et al 2007). However, a single phase NdBa 2 ZrO 5·5 could be obtained through solid state reaction route only after prolonged calcinations of the reaction mixture at 1000 • C for 38 h with multiple intermediate grindings.…”