Development of Single Solution Buffer Layers on Textured Ni Substrate for HTS Coated Conductors

All chemical YBa2Cu3O7 superconducting multilayers: Critical role of CeO2 cap layer flatness

“…[3][4][5] However, the major goal now for CC technology to be competitive is to demonstrate the suitability of low-cost deposition techniques, such as chemical solution deposition (CSD) in which YBCO is grown by the trifluoroacetate route (TFA) 6,7 and buffer layers by metalorganic decomposition (MOD). [8][9][10] MOD-SrTiO 3 and MOD-CeO 2 have capitalized the attention of the researchers for its high potential as cap layers. Indeed, attractive J c values [$1 MA/cm 2 (77 K)] have been obtained using MOD-(Nb-doped) SrTiO 3 as single buffer layer on Ni-rollingassisted biaxially textured substrates (RABiTs), 11 MOD-CeO 2 on MOD-La 2 Zr 2 O 7 buffered Ni-RABITs, 12 or MOD-CeO 2 on ion-beam-assisted deposition (IBAD)stainless steel 13 ; however, they are far from the target value of 3-4 MA/cm 2 at 77 K. So far the great potential of CeO 2 on Ni-RABiT has been limited to medium lowcost approaches 10,[14][15][16] mostly because of the complexity to obtain highly textured MOD-CeO 2 under reducing atmosphere to match the criteria protection of the metallic substrate.…”

“…[8][9][10] MOD-SrTiO 3 and MOD-CeO 2 have capitalized the attention of the researchers for its high potential as cap layers. Indeed, attractive J c values [$1 MA/cm 2 (77 K)] have been obtained using MOD-(Nb-doped) SrTiO 3 as single buffer layer on Ni-rollingassisted biaxially textured substrates (RABiTs), 11 MOD-CeO 2 on MOD-La 2 Zr 2 O 7 buffered Ni-RABITs, 12 or MOD-CeO 2 on ion-beam-assisted deposition (IBAD)stainless steel 13 ; however, they are far from the target value of 3-4 MA/cm 2 at 77 K. So far the great potential of CeO 2 on Ni-RABiT has been limited to medium lowcost approaches 10,[14][15][16] mostly because of the complexity to obtain highly textured MOD-CeO 2 under reducing atmosphere to match the criteria protection of the metallic substrate. Detailed studies on the growth mechanism and microstructure evolution of nanostructured MOD-CeO 2 on (001)YSZ single-crystal substrates revealed that under reducing atmospheres, carbon impurities from metal organic precursors decorate grain boundaries inhibiting the epitaxial grain growth.…”

Aqueous Chemical Solution Deposition of Novel, Thick and Dense Lattice-Matched Single Buffer Layers Suitable for YBCO Coated Conductors: Preparation and Characterization

“…Hence, buffer layers are absolutely necessary for coated conductor designs. Many buffer layers, including lanthanum zirconate (LZO) [2,3,4,5,6], cerium oxide (CeO 2 ) [7,8,9,10] and other lattice-matched buffer layers [11,12,13,14,15,16,17,18,19,20] which are prepared basically using solution-based methods have been used. These buffer layers should not only stop diffusion but also transfer the epitaxial texture of Ni-5% W substrate to the superconducting layer.…”

“…Owing to the high cost of multiple buffer layer depositions of LZO and CeO 2 , researchers have focused on preparing a single buffer layer with almost 0% lattice mismatch with YBCO and it was reported that the in-plane orientation of YBCO can be improved with these lattice matched buffer layers [11,12,13,14,15,16,17,18]. …”

Deposition of Gd2Zr2O7 single buffer layers with different thickness for YBa2Cu3O7−δ coated conductors on metallic substrates

“…It should be noted that this material is also used as a buffer layer in the IBAD approach for coated conductors [7][8][9]. Furthermore, GZO films prepared by chemical solution deposition [10][11][12] or electrodeposition [13] were tested in combination with CeO 2 , Y 2 O 3 or Gd 2 O 3 layers on Ni-W RABiTS tapes. Here, we studied the epitaxial growth of GZO buffers prepared by pulsed laser deposition, to check the suitability of GZO as single buffer layer on highly textured Ni-5% W tapes.…”