Improving sol-gel Yba2Cu3O7−δ film morphology using high-boiling-point solvents

2002 ◽  
Vol 17 (8) ◽  
pp. 1900-1903 ◽  
Author(s):  
J. T. Dawley ◽  
P. G. Clem ◽  
M. P. Siegal ◽  
D. R. Tallant ◽  
D. L. Overmyer
Keyword(s):  
Critical Current Density ◽  
Boiling Point ◽  
Sol Gel ◽  
Film Morphology ◽  
High Quality ◽  
Proper Selection ◽  
Ybco Films ◽  
Superconducting Wires ◽  
Sol Gel Process ◽  
High Boiling Point

The effect of high-boiling-point solvent addition on the morphology of low-p(O2) processed, sol-gel YBa2Cu3O7−δ (YBCO) films is discussed. Proper selection and addition of a high-boiling-point solvent prevents film roughening during precursor pyrolysis, while permitting at least a tenfold reduction in pyrolysis time compared to standard film processing in air or O2. Use of such solvents appears to increase film plasticity, avoiding elastic compressive stress related buckling. High-quality YBCO films on 〈100〉 LaAlO3 with a critical current density (Jc) ∼ 3–4 MA/cm2 at 77 K, are routinely crystallized with this new sol-gel process. Diethanolamine-based, sol-gel YBCO films deposited on sol-gel SrTiO3-buffered 〈100〉 Ni have Jc(77 K) > 1 MA/cm2, demonstrating a route toward all-sol-gel superconducting wires.

An efficient single-mode Nd3+ fiber laser prepared by the sol-gel method

1994 ◽  
Vol 9 (10) ◽  
pp. 2703-2705 ◽  
Author(s):  
Fengqing Wu ◽  
David Machewirth ◽  
Elias Snitzer ◽  
George H. Sigel
Keyword(s):  
Fiber Laser ◽  
Glass Fiber ◽  
Fluorescence Lifetime ◽  
Sol Gel ◽  
Single Mode ◽  
Neodymium Oxide ◽  
Laser Oscillator ◽  
High Quality ◽  
Gel Method ◽  
Sol Gel Process

High quality Nd-doped single-mode fibers have been prepared by using a sol-gel process. The longest fluorescence lifetime measured was 520 μs in an Al: SiO2 glass fiber containing 0.47 wt.% neodymium oxide. An efficient neodymium fiber laser with a slope above threshold of 42% was successfully demonstrated with the sol-gel prepared Nd-doped single-mode fibers as a fiber laser oscillator.

Preparation of YBCO Superconducting Films by Sol-Gel Process

2007 ◽  
Vol 546-549 ◽  
pp. 2007-2010
Author(s):  
Gao Yang Zhao ◽  
Huang Li Zhang ◽  
Ren Zhong Xue ◽  
Yuan Qing Chen ◽  
Li Lei
Keyword(s):  
Sol Gel ◽  
Precursor Solution ◽  
Superconducting Films ◽  
Superconducting Transition ◽  
X Ray Diffraction ◽  
Organic Salts ◽  
Ybco Films ◽  
X Ray ◽  
Sol Gel Process ◽  
Ybco Superconducting Films

precursor solution was prepared using barium trifluoroacetae (Ba-TFA) and non-fluorine yttrium (Y) and copper (Cu) organic salts. The precursor solution was modified by benzalacetone (BzAcH), in which the Cu2+ were chelated with BzAcH, which preventing the loss of Cu in the pyrolysis process. Dense YBCO superconducting films with smooth surface, which confirmed by scanning electron microscopy (SEM), were repeatedly obtained through sol-gel process. X-ray diffraction (XRD) 2θ scanning and φ scanning indicated that the as-prepared YBCO films had good c-axis texture. YBCO films with superconducting transition temperature (TC) above 89K were obtained.

High-quality ZrO2/Si(001) thin films by a sol-gel process: Preparation and characterization

2010 ◽  
Vol 107 (9) ◽  
pp. 094103 ◽  
Author(s):  
H. Döscher ◽  
G. Lilienkamp ◽  
P. Iskra ◽  
W. Daum ◽  
G. Helsch ◽  
...  
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
High Quality ◽  
Sol Gel Process

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.

Seed-layer induced growth of high-quality oriented ZnO films by a sol–gel process

2006 ◽  
Vol 290 (1) ◽  
pp. 67-72 ◽  
Author(s):  
Can-Yun Zhang ◽  
Xiao-Min Li ◽  
Xia Zhang ◽  
Wei-Dong Yu ◽  
Jun-Liang Zhao
Keyword(s):  
Seed Layer ◽  
Sol Gel ◽  
Zno Films ◽  
High Quality ◽  
Sol Gel Process

Water-Vapor-Controlled Reaction for Fabrication of YBCO Films by Fluorine-Free Sol-Gel Process

2010 ◽  
Vol 20 (5) ◽  
pp. 2286-2293 ◽  
Author(s):  
Li Lei ◽  
Gaoyang Zhao ◽  
Juanjuan Zhao ◽  
Hui Xu
Keyword(s):  
Water Vapor ◽  
Sol Gel ◽  
Ybco Films ◽  
Sol Gel Process

Ultrasmooth metal halide perovskite thin films via sol–gel processing

2016 ◽  
Vol 4 (21) ◽  
pp. 8308-8315 ◽  
Author(s):  
Ross A. Kerner ◽  
Lianfeng Zhao ◽  
Zhengguo Xiao ◽  
Barry P. Rand
Keyword(s):  
Thin Film ◽  
Film Formation ◽  
Sol Gel ◽  
Metal Halide ◽  
Film Morphology ◽  
Metal Halide Perovskite ◽  
Sol Gel Process ◽  
Thin Film Formation ◽  
Halide Perovskite ◽  
Gel Processing

We show that metal halide perovskite thin film formation is a sol–gel process which allows us to improve film morphology, achieving roughness ∼1 nm via process and additive engineering.

scholarly journals Highly Textured Seed Layers for the Growth of Vertically Oriented ZnO Nanorods

Crystals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 566 ◽  
Author(s):  
Nikola Basinova ◽  
Ondrej Cernohorsky ◽  
Jan Grym ◽  
Sarka Kucerova ◽  
Hana Faitova ◽  
...  
Keyword(s):  
Sol Gel ◽  
Zno Nanorods ◽  
Dip Coating ◽  
Vertical Alignment ◽  
High Quality ◽  
Axis Orientation ◽  
Sol Gel Process ◽  
High Quality Seed ◽  
Growth Methods ◽  
Seed Layers

One dimensional ZnO nanostructures prepared by favorable and simple solution growth methods are at the forefront of this research. Vertically oriented ZnO nanorods with uniform physical properties require high-quality seed layers with a narrow size distribution of the crystallites, strong c-axis orientation, and low surface roughness and porosity. It has been shown that high quality seed layers can be prepared by the sol–gel process. The sol–gel process involves three essential steps: preparation of the sol, its deposition by dip coating, and thermal treatment comprising preheating and annealing. We put emphasis on the investigation of the heat treatment on the properties of the seed layers and on the vertical alignment of the nanorods. It was demonstrated that for the vertical alignment of the nanorods, the preheating step is crucial and that the temperatures reported in the literature have been too low. With higher preheating temperatures, conditions for the vertical alignment of the nanorods were achieved in both investigated annealing atmospheres in air and in argon.

High Jc YBa2Cu3O7-δ films via rapid, low pO2 pyrolysis

2001 ◽  
Vol 16 (1) ◽  
pp. 13-16 ◽  
Author(s):  
J. T. Dawley ◽  
P. G. Clem ◽  
M. P. Siegal ◽  
D. L. Overmyer
Keyword(s):  
Trifluoroacetic Acid ◽  
Processing Time ◽  
Sol Gel ◽  
High Quality ◽  
Metal Acetate ◽  
Ybco Films

In this investigation YBa2Cu3O7-δ (YBCO) films were fabricated via a metal acetate, trifluoroacetic acid based sol-gel route and spin-coat deposited on (100) LaAlO3 with a focus on maximizing Jc, while minimizing processing time. We demonstrate that the use of a low-pO2 atmosphere during the pyrolysis stage can lead to at least a tenfold reduction in pyrolysis time, compared to a 1 atm O2 ambient. High-quality YBCO films on LaAlO3, with Jc values up to 3 MA/cm2 at 77 K, can be routinely crystallized from these rapidly pyrolyzed films.

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