Thickness dependence of microstructure and critical current density of Yba2Cu3O7−δ on rolling-assisted biaxially textured substrates

2003 ◽  
Vol 18 (5) ◽  
pp. 1109-1122 ◽  
Author(s):  
K. J. Leonard ◽  
A. Goyal ◽  
D. M. Kroeger ◽  
J. W. Jones ◽  
S. Kang ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Ybco Film ◽  
Cube Texture ◽  
Film Surface ◽  
Second Phase ◽  
Film Properties ◽  
Cross Sectional ◽  
Ybco Films

The change in microstructure associated with the decrease in critical current density (Jc) of Yba2Cu3O7−δ (YBCO) films with increasing thickness was examined. Samples of pulse laser deposited YBCO films varying in thickness from 0.19 to 3.0 μm on rolling-assisted biaxially textured substrates with an architecture of CeO2/YSZ/CeO2/Ni were prepared by tripod polishing for cross-sectional electron microscopy. More randomly oriented grains in the upper portion of the YBCO film surface were observed with increasing film thickness, resulting in less cube texture. In addition, increases in mismatch across the boundaries of the c-axis grains with increasing time during deposition, along with the development of BaCeO3 and Y2BaCuO5 phases at the YBCO/CeO2 interface, contributed to the degradation of film properties. Surface outgrowths of the YBCO film were examined as well as the defect structures and second-phase formations within the films.

Fabrication of High Jc YBa2Cu3O7-δ Coated Conductors Using Sol-Gel Buffer Layers On Nickel and Nickel Alloy Substrates

2001 ◽  
Vol 689 ◽  
Author(s):  
S. Sathyamurthy ◽  
M. Paranthaman ◽  
B. W. Kang ◽  
H. Y. Zhai ◽  
T. Aytug ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Sol Gel ◽  
Rf Sputtering ◽  
Cube Texture ◽  
Dip Coating ◽  
Coated Conductors ◽  
Buffer Layers ◽  
Ybco Films

Sol-gel processing of La2Zr2O7 (LZO) buffer layers on biaxially textured Ni-3 at.% W alloy substrates using a continuous reel-to-reel dip-coating unit has been studied. The epitaxial LZO films obtained have a strong cube texture and uniform microstructure. The effect of increasing the annealing speed on the texture, microstructure and the carbon content retained in the film were studied. On top of the LZO films, epitaxial layers of Yttria Stabilized Zirconia (YSZ) and Ceria (CeO2) were deposited using rf sputtering, and YBa2Cu3Ox (YBCO) films were then deposited using Pulsed Laser Deposition (PLD). A critical current density (Jc) of 1.9 MA/cm2 at 77K and self-field and 0.34 MA/cm2 at 77K and 0.5T have been obtained on these films. These values are comparable to those obtained on YBCO films deposited on all-vacuum deposited buffer layers, and are the highest ever obtained using solution seed layers. The use of all-solution buffers for coated conductor processing has also been explored. A critical current density of 1.1 MA/cm2 at 77 K and self-field was obtained on YBCO films grown be PLD on LZO buffered nickel substrates.

Comparative Study of Thickness Dependence of Critical Current Density of Yba2Cu3O7–δ on (100) SrTiO3 and on Rolling-assisted Biaxially Textured Substrates

2002 ◽  
Vol 17 (7) ◽  
pp. 1750-1757 ◽  
Author(s):  
B. W. Kang ◽  
A. Goyal ◽  
D. F. Lee ◽  
J. E. Mathis ◽  
E. D. Specht ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Critical Current Density ◽  
Film Thickness ◽  
Comparative Study ◽  
Critical Current ◽  
Current Density ◽  
Pulsed Laser ◽  
Cube Texture ◽  
Laser Deposition ◽  
Ybco Films

We investigated the dependence of critical current density (Jc) on thickness of Yba2Cu3O7−δ (YBCO) films grown by pulsed laser deposition on (100) SrTiO3 (STO) and on rolling-assisted biaxially textured substrates (RABiTS). The thickness of YBCO films varied from 0.19 to 3 μm. The highest Jcs of 5.3 and 2.6 MA/cm2 at 77 K, self-field were obtained for 0.19-μm YBCO films on STO and RABiTS, respectively. Jc was found to decrease exponentially with YBCO thickness on both substrates. However, the results suggest different mechanisms are responsible for the Jc reduction in the two cases. On STO, growth of a-axis grains within c-axis films and broadening of the in-plane texture were observed in thick films. On RABiTS, degradation in cube texture as well as development of a porous surface morphology were found to correlate with film thickness.

scholarly journals High Temperature Superconducting Thick Films by use of EPD Method (II)

2017 ◽  
Vol 5 (1) ◽  
pp. 69
Author(s):  
Soh Deawha ◽  
N. Korobova ◽  
Park Jungcheul
Keyword(s):  
High Temperature ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Thick Films ◽  
Film Surface ◽  
Deposition Method ◽  
Ybco Films ◽  
High Temperature Superconducting ◽  
Superconducting Thick Films

<p>High temperature superconducting (HTS) thick films deposited on metal Ag wire were prepared with YBCO and BSCCO powders by electrophoretic deposition method. I<sub>2</sub> was used as additives for surface charge of YBCO and BSCCO particles. When 2-3 wt.% BaF<sub>2</sub> was added in the YBCO suspension, the pores and cracks of film surface were decreased and film density could be increased. In case of YBCO films, the critical current density (J<sub>c</sub>) was calculated at the value of 1458 A/cm<sup>2</sup> (77 K, 0 K) by 4 point prove method. BSCCO films had less cracks than YBCO films, and the critical current density (J<sub>c</sub>) was obtained more than 10<sup>4</sup> A/cm<sup>2</sup>.</p>

EFFECT OF THE SECOND PHASE ON CRITICAL CURRENT DENSITY IN Nb-ADDED YBCO FILMS

1995 ◽  
Vol 09 (07) ◽  
pp. 439-443 ◽  
Author(s):  
JUN-HUI JIA ◽  
ZHEN-ZHONG QI
Keyword(s):  
Thin Films ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Superconducting Films ◽  
Superconducting Phase ◽  
Second Phase ◽  
Dc Magnetron Sputtering ◽  
Ybco Films ◽  
Crystalline Substrate

Thin films of YBCO with or without Nb added were prepared on (100) ZrO 2 single crystalline substrate by dc magnetron sputtering method. A phase of YBa 2 NbO 6 was found to form not only in the target materials of YBCO but also in the sputtered thin films. The second phase of YBa 2 NbO 6 in the superconducting films destroyed a match relation between the lattice of YBCO and the lattice of ZrO 2 substrate. The measurements of critical current density J c under magnetic field (H // c axis, up to 5T) showed that the J c in Nb-added YBCO films reduced more apparently than that in YBCO films. It is concluded that the existence of second phase of YBa 2 NbO 6 in superconducting phase does not play a rule of flux pinning.

Control of Y2O3 nanoislands deposition parameters in order to induce defects formation and its influence on the critical current density of YBCO films

2005 ◽  
Vol 426-431 ◽  
pp. 1108-1112 ◽  
Author(s):  
P. Mele ◽  
K. Matsumoto ◽  
T. Horide ◽  
O. Miura ◽  
A. Ichinose ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Ybco Films ◽  
Deposition Parameters

An all-field-range description of the critical current density in superconducting YBCO films

2011 ◽  
Vol 24 (10) ◽  
pp. 105020 ◽  
Author(s):  
I A Golovchanskiy ◽  
A V Pan ◽  
O V Shcherbakova ◽  
S A Fedoseev ◽  
S X Dou
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Field Range ◽  
Ybco Films

High critical current density thick MOD-derived YBCO films

1999 ◽  
Vol 9 (2) ◽  
pp. 1531-1534 ◽  
Author(s):  
J.A. Smith ◽  
M.J. Cima ◽  
N. Sonnenberg
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
High Critical Current Density ◽  
Ybco Films

Effect of the microscopic correlated-pinning landscape on the macroscopic critical current density in YBCO films

2000 ◽  
Vol 341-348 ◽  
pp. 1177-1178 ◽  
Author(s):  
G. Ghigo ◽  
A. Chiodoni ◽  
R. Gerbaldo ◽  
L. Gozzelino ◽  
F. Laviano ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Ybco Films

Texture influence on critical current density of YBCO films deposited on (100)-MgO substrates

1994 ◽  
Vol 235-240 ◽  
pp. 627-628 ◽  
Author(s):  
M. Pernet ◽  
D. Chateigner ◽  
P. Germi ◽  
C Dubourdieu ◽  
O. Thomas ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Ybco Films
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