A5021620419- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- Superconductivity in MgB2 and Alloys
- Advanced Condensed Matter Physics
- Superconducting Materials and Applications
- Electronic and Structural Properties of Oxides
- Advancements in Solid Oxide Fuel Cells
- HVDC Systems and Fault Protection
- Semiconductor materials and devices
- ZnO doping and properties
- Magnetic properties of thin films
- Advanced materials and composites
- Particle accelerators and beam dynamics
- Iron-based superconductors research
- Thin-Film Transistor Technologies
- Dental materials and restorations
- Additive Manufacturing Materials and Processes
- Advanced ceramic materials synthesis
- Particle Accelerators and Free-Electron Lasers
- Dental Research and COVID-19
- Quantum and electron transport phenomena
- Nanowire Synthesis and Applications
- Acoustic Wave Resonator Technologies
- Advanced X-ray and CT Imaging
- Nanoporous metals and alloys
Manufacturing Institute
2016-2025
University of Houston
2016-2025
Fermi National Accelerator Laboratory
2024
Superconductor Technologies (United States)
2008-2024
Purpose: One critical prerequisite for dental shade guides is to match the color range and distribution of human teeth. The purpose this study was design computer models compare them with an existing guide. A targeted coverage error a newly developed guide Δ E ab < 2 corresponding CIE2000 value. Materials Methods: total 1064 teeth were evaluated in vivo using intra‐oral spectrophotometer. Shade designed different methods representation data set, hierarchical clustering, nonlinear...
The critical current and structural properties of (Gd,Y)BaCuO tapes made by metal organic chemical vapor deposition (MOCVD) with Zr addition levels up to 30 at.% have been investigated. reduction in beyond the previously optimized level 7.5 was found be due deterioration (Gd,Y)Ba2Cu3Ox film. By a modified MOCVD process, enhanced densities achieved high addition, including 3.83 MA cm−2 15 Zr-added 1.1 μm thick film at 77 K zero magnetic field. Critical currents as 1072 A/12 mm reached field 3...
Second-generation (2G) HTS wires are now being produced routinely in kilometer lengths using Metal Organic Chemical Vapor Deposition (MOCVD) process with critical currents of 300 A/cm. While this achievement is enabling several prototype devices, order to reach a substantial commercial market, the cost-performance metrics 2G need be significantly improved device operating conditions. Zr-doping has been found an effective approach improve in-field current performance MOCVD-based wires. In...
Critical current performances of state-of-the-art Zr-added (Gd, Y)BaCuO tapes have been investigated over a temperature range 20–77 K, in magnetic fields up to 9 T and wide angular field orientations. The peak critical that is commonly observed the orientation perpendicular tape BaZrO3 (BZO) containing superconducting found vanish at 30 K 1–9 T. While 15% was about 40% lower than 7.5% 77 pinning force values former were be 18–23% higher those latter 20–40 3–5 results from this study...
We report on remarkably high in-field performance at 4.2 K achieved in >4 μm thick rare earth barium copper oxide (REBCO) samples with Zr addition. Two different have been measured independently Lawrence Berkeley National Laboratory and the High Magnetic Field Laboratory, achieving critical current densities (Jc) of 12.21 MA cm−2 12.32 K, 14 T (), respectively, which corresponds to equivalent (Ic) values 2247 2119 A/4 mm. These Ic are about two times higher than best reported REBCO tapes...
The purpose of this study was to determine perceptibility and acceptability thresholds for color differences in light dark skin-colored maxillofacial elastomers.A total 15 pairs specimens (mimicking white, Asian, Hispanic skin) African-American were made using silicone elastomers, combined with opacifiers pigments. Color match/mismatch acceptable/unacceptable mismatch each pair visually evaluated by 45 evaluators under controlled conditions a viewing booth. calculated CIELAB CIEDE2000...
In recent years, remarkable technical advances have been achieved in the development of Rare-earth-Ba-Cu-O (REBCO) based coated conductors for large-scale applications. For coil-based applications (e.g., motors, generators, magnets), addition to high critical current density under applied field, conductor also needs maintain mechanical integrity when exposed transverse tensile stresses typically found impregnated coils. this study, we present a detailed analysis microstructure REBCO...
Critical current (Ic) values of 1384 A/12 mm, corresponding to a critical density 12.47 MA cm−2 and pinning force 374 GN m−3, have been achieved at 30 K, 3 T in the orientation field parallel c axis (B ∥ c) (Gd, Y)BaCuO tapes with 15 mol% Zr addition made by metal organic chemical vapor deposition (MOCVD). These show levels as high 453 m−3 K. An analysis properties 24–28 showed lack correlation between their currents Ic both 77 zero 1 c). However, strong was found It has also discovered that...
A significant increase of critical current in high magnetic field, up to 31 T, was recorded long tapes manufactured by employing a double-disorder route. In double-disordered high-temperature superconductor (HTS), superimposing intrinsic and extrinsic disorder takes place way that (i) the is caused local stoichiometry deviations lead defects crystallinity serve as pining centers YBa2Cu3Ox−δ matrix (ii) introduced via embedded atoms or particles foreign material (e.g. barium zirconate), which...
An Advanced MOCVD (A-MOCVD) reactor was used to deposit 4.8 µm thick (Gd,Y)BaCuO tapes with 15 mol% Zr addition in a single pass. A record-high critical current density (J c ) of 15.11 MA/cm2 has been measured over bridge at 30 K, 3T, corresponding an equivalent (I value 8705 A/12 mm width. This corresponds lift factor ~11 which is the highest ever reported best author's knowledge. The densities 3T (B||c) and 30, 40 50 respectively, are 15.11, 9.70 6.26 MA/cm2, Ic values 8705, 5586 3606...
We present the development of a novel Metal Organic Chemical Vapor Deposition (MOCVD) system aimed at producing high performance 2G-HTS wire in ARPA-E GRIDS program on Superconducting Magnetic Energy Storage. A susceptor-free MOCVD with non contact optical temperature monitoring and highly laminar parallel flow confined volume has been developed to address issues a-axis grain formation low precursor conversion efficiency conventional designs. For first time, near-1000 A/12 mm critical...
We present results on the in-field critical current (Ic) performance of 4.0 μm thick REBCO film with 15% Hf addition up to 31.2 T at field orientations B||ab plane and B||c axis. Unlike behavior B||c, is only very weakly dependent field, decreasing from self-field by 22%, i.e., value ~7700 A/4mm width ~6300 5812 A/4 mm 14 30 T, respectively. These values are remarkably 3 5.7x higher than corresponding currents B||c. The sample orientation axis near-identical previously reported record found...
We report the latest developments of next-generation flexible round RE–Ba–Cu–O (REBCO, RE = rare earth) wire, driven by needs compact accelerator magnets requiring isotropic wire with an engineering current density (J e ) 600 A mm−2 at 4.2 K, 20 T a bend radius 15 mm. have developed Symmetric Tape Round (STAR) REBCO using multiple layers tapes specifically for this architecture, featuring mechanically symmetric geometry 10–18 μm thick substrate wherein superconductor film is positioned near...
Abstract An approach to fabricate double-sided, high-current RE-Ba 2 Cu 3 O 7− δ (REBCO) tapes for use in ultrahigh-field superconducting magnets operating at and above 20 T is demonstrated. In this work, we modified our advanced metal organic chemical vapor deposition (A-MOCVD) reactor deposit REBCO films on each side of a double-sided buffer substrate single pass. The composition, thickness, critical current ( I c ) 1 µ m-thick the are compared. Double-sided tape with showed self-field...
Trapped magnetic field profiles were investigated in thin film (Gd,Y)Ba2Cu3Ox superconducting tapes stacked different configurations consisting of three 12 mm wide, 36 long per layer. The trapped values found to increase monotonically with the increasing number tape layers stack. A crisscross arrangement was yield a more uniform trapped-field profile than straight tapes. Furthermore, decay rate as function distance from stack surface be lower arrangement.
A main challenge that significantly impedes REBa2Cu3Ox (RE = rare earth) coated conductor applications is the low engineering critical current density J e because of superconductor fill factor in a complicated layered structure crucial for to carry supercurrent. Recently, we have successfully achieved beyond 2.0 kA/mm2 at 4.2 K and 16 T, by growing thick layer, from ∼1.0 μm up ∼3.2 μm, as well controlling pinning microstructure. Such high density, highest value ever observed so far,...
An advanced MOCVD (A-MOCVD) reactor has been developed with an aim of addressing the issues found in most superconductor deposition techniques such as a-axis grain formation, degradation texture thick films and poor source-to-film conversion efficiency. A record high-lift factor ~9 critical current 3346 A/12 mm at 30 K, 2.5 T, B||c have demonstrated produced a single pass A-MOCVD reactor. The performance results achieved are not possible conventional without resorting to two-pass for...
Abstract RE–Ba–Cu–O (REBCO, RE = rare earth) symmetric tape round (STAR ® ) wires of 1.5–2.5 mm diameter have been fabricated with 4–12 strands REBCO made by advanced metal organic chemical vapor deposition (MOCVD). 1.5 STAR just four MOCVD are able to sustain nearly the same critical current ( I c as 2.5 12 commercial-grade strands. An 1070 A, corresponding an engineering density J e 597 A −2 , has demonstrated at 4.2 K, 30 T in diameter, four-strand wire a bend radius 15 mm. This value...
Combined twist and tensile loading states are expected in many applications of YBCO coated conductors. Wire is introduced due to winding on complex shapes or for AC loss reduction, while originates from sources such as differential thermal expansion inertial forces. In this study, we analyse the electromechanical behavior an IBAD/MOCVD conductor configuration with superconducting layer deposited hastelloy substrate encapsulated by copper. The effect pre-applied degradation current carrying...
Filamentization of 2G-HTS tapes provides a means for significant reduction magnetization AC losses in coated conductors. Photolithography followed by dry etching is one the approaches to `top-down' filamentization REBCO (RE=rare earth) and shunt layers. Some issues associated with this approach include undercuts, as well complexity cost process. In work, we present results on study aimed at developing an alternative, `bottom-up' technique that free has low cost, high throughput readily...