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Journal articles on the topic 'Yttrium-barium Copper Oxide Superconductors'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 September 2023

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1

Boston, R., K. Awaya, T. Nakayama, W. Ogasawara, and S. R. Hall. "Formation of superconducting yttrium barium copper oxide using sulphur-containing templates." RSC Adv. 4, no. 51 (2014): 26824–28. http://dx.doi.org/10.1039/c4ra04745a.

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2

BRINKMANN, D. "ChemInform Abstract: Comparing Yttrium Barium Copper Oxide Superconductors by Copper, Oxygen and Barium NMR/NQR." ChemInform 24, no. 14 (August 20, 2010): no. http://dx.doi.org/10.1002/chin.199314326.

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3

Paranthaman, M. Parans, and Teruo Izumi. "High-Performance YBCO-Coated Superconductor Wires." MRS Bulletin 29, no. 8 (August 2004): 533–41. http://dx.doi.org/10.1557/mrs2004.159.

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AbstractThis issue of MRS Bulletin provides an overview of the current status of research and development in the area of high-temperature superconductor (HTS) wires. High-temperature oxide superconductors, discovered in the late 1980s, are moving into the second generation of their development.The first generation relied on bismuth strontium calcium copper oxide, and the second generation is based on yttrium barium copper oxide, which has the potential to be less expensive and to perform better.The potential uses of HTS wires for electric power applications include underground transmission cables, oil-free transformers, superconducting magnetic-energy storage units, fault-current limiters, high-efficiency motors, and compact generators.Wires of 10–100 m in length can now be made, but material and processing issues must be solved before an optimized production scheme can be achieved.This issue covers a range of processing techniques using energetic beams, rolling, and laser and chemical methods to form wires with good superconducting properties.

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4

Bowmer, T. N., and F. K. Shokoohi. "Synthesis of superconductors from metal neodecanoates." Journal of Materials Research 6, no. 4 (April 1991): 670–76. http://dx.doi.org/10.1557/jmr.1991.0670.

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Metal-organic precursors can facilitate the production of superconducting thin films on large area substrates for microelectronic device applications. This paper describes the chemistry that occurs during the thermal processing of yttrium-, barium-, and copper-neodecanoate mixtures into a superconducting material, YBa2Cu3O7−x. Intermediates such as metal carbonates and oxides are identified by combining thermogravimetry with infrared spectral and x-ray diffraction analysis. Changing from argon to oxygen atmospheres increased decomposition rates and metal oxide formation. We found that (1) a low temperature (500–600 °C) decomposition in an oxygen-poor atmosphere, (2) a high temperature (>925 °C) annealing step in an oxygen-rich atmosphere, and (3) slow cooling to 50 °C are all required to produce uniform superconducting films.

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5

Cahen, David, Michael Schwartz, Shimon Reich, and Israel Felner. "Characterization of yttrium barium (copper,silver)oxide YBa2(Cu,Ag)O7 superconductors." Inorganic Chemistry 26, no. 22 (November 1987): 3653–55. http://dx.doi.org/10.1021/ic00269a007.

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6

Çelebi, S., A. Öztürk, U. Kolemen, and M. A. R. LeBlanc. "Observations of a hysteresis loss valley in yttrium barium copper oxide superconductors." Journal of Applied Physics 100, no. 7 (October 2006): 073912. http://dx.doi.org/10.1063/1.2357840.

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7

Dai, Yuanfang, J. S. Swinnea, H. Steinfink, J. B. Goodenough, and Alan Campion. "Raman spectroscopy of the high Tc superconductor yttrium barium copper oxide (YBa2Cu3O7) and the semiconductor yttrium barium copper oxide (YBa2Cu3O6)." Journal of the American Chemical Society 109, no. 17 (August 1987): 5291–92. http://dx.doi.org/10.1021/ja00251a051.

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8

Pettit, Donald R., Dean E. Peterson, Kimberly A. Kubat-Martin, John J. Petrovic, Haskell Sheinberg, Yates Coulter, and Delbert E. Day. "Processing yttrium barium copper oxide superconductor in near-zero gravity." Journal of Crystal Growth 139, no. 3-4 (May 1994): 302–8. http://dx.doi.org/10.1016/0022-0248(94)90179-1.

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9

Zhang, J. P., D. J. Li, C. Boldt, R. Plass, V. Dravid, L. D. Marks, C. H. Lin, et al. "Microstructure and properties of Cu-rich 123: Part II. Homogeneous copper and high magnetic Jc." Journal of Materials Research 8, no. 6 (June 1993): 1232–39. http://dx.doi.org/10.1557/jmr.1993.1232.

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Copper- and yttrium-rich YBa2Cu3O7 bulk superconductors have been prepared by mixing copper oxide or yttrium oxide in nitric acid and adding the solution to premade stoichiometric YBa2Cu3O7 followed by annealing. In contrast to materials made by mixing oxide powders, both samples contain copper-rich defects spread homogeneously throughout the grains, either small platelet copper oxide precipitates or bundles of planar defects (Cu–O double planes). These materials also show large magnetic hysteresis at 77 K, comparable to the results obtained from decomposed YBa2Cu4O8. This implies that small copper oxide precipitates and bundles of planar defects are strong flux pinners, and indicates a processing route to producing large amounts of strongly intragranular pinned superconductors. However, the materials also show clean grain boundaries, so an equally valid interpretation is that there is a substantial component of intergranular superconductivity in field, enhancing the effective circuit size to a value far larger than the grain size.

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10

Hegde, M. S., K. M. Satyalakshmi, S. Ramesh, N. Y. Vasanthacharya, and J. Gopalakrishnan. "New defect-perovskite oxides related to the yttrium-barium-copper oxide superconductor." Materials Research Bulletin 27, no. 9 (September 1992): 1099–106. http://dx.doi.org/10.1016/0025-5408(92)90249-y.

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11

Briant, C. L., J. A. DeLuca, P. L. Karas, M. F. Garbauskas, J. A. Sutliff, A. Goyal, and D. Kroeger. "The microstructural evolution of a silver-containing spray deposited 1223 Tl–Ca–Ba–Cu oxide superconductor." Journal of Materials Research 10, no. 4 (April 1995): 823–42. http://dx.doi.org/10.1557/jmr.1995.0823.

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This paper reports a study of the microstructural evolution of Ag-containing 1223 Tl-Ca-Ba-Cu oxide superconductors in spray-deposited films. The films were formed by spray depositing nitrates of Ca, Ba, Cu, and Ag onto a polycrystalline yttria-stabilized zirconia substrate. These deposits were then converted to a mixture of oxides (calcia, calcium-copper oxide, and barium cuprate) and metallic silver by heating in oxygen. When thallium oxide vapor was passed over the film, the thallium was incorporated into the film and the 1223 phase was formed. The evidence strongly suggests that the development of the 1223 superconductor involves the formation of a liquid phase. Our analysis suggests that the initial phase to form a liquid is CaO which contains thallium, barium, copper, and silver. Once this initial liquid is formed, it incorporates more thallium which, in turn, allows it to dissolve other types of oxides present in the film. In this way the liquid spreads across the surface. The equilibrium 1223 phase precipitates from it.

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12

Puri, Micky, Jurek Masiakowski, Sean Marrelli, Steve O'Connor, John Bear, and Larry Kevan. "Low-field microwave absorptions of silver-doped yttrium barium copper oxide (YBa2Cu3O7-.delta.) superconductors." Journal of Physical Chemistry 95, no. 3 (February 1991): 1152–59. http://dx.doi.org/10.1021/j100156a024.

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13

Toumvong, Wipawadee, Pornnita Chitcharoentaweechoke, and Nuchnapa Tangboriboon. "Bio-dielectric based on superconductors yttrium calcium barium copper oxide (YCaBa₂Cu₃O_7−x) from eggshell as calcium oxide source via sol-gel process." Materials Science-Poland 39, no. 3 (September 1, 2021): 305–18. http://dx.doi.org/10.2478/msp-2021-0026.

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Abstract Eggshell is a rich source of calcium that is a dielectric material used for doping in a superconductor. Yttrium calcium barium copper oxide (Y x Ca1−x Ba2Cu3O7) was prepared using the sol-gel process and fired at 900 °C or 1,000 °C. The stoichiometric ratio of the raw materials Y2O3:BaCl2:CuO:CaO was 1:2:3:1 based on the molar mass. The obtained YCaBCO had an orthorhombic crystal structure composed of distorted oxygen-deficient perovskite. The orthorhombic structure was unsymmetrical, providing a substantial increase in the physical electromagnetic properties of the superconductor. The YBCO-900-reference analyzed using an impedance analyzer in the range from 500 Hz to (1 × 106) Hz and at room temperature (27 °C) had the following values for capacitance, electrical conductivity, and dielectric constant ± standard error: 8,286.70 ± 28.49 pF, (3.60 ± 0.01) × 107 S/m, and 1,874.794 ± 6.446, respectively. The YCaBCO-900-eggshell (Y x Ca1−x Ba2Cu3O7) analyzed at 500 Hz at room temperature (27 °C) had high values for capacitance, electrical conductivity, and dielectric constant, namely, 8,540.10 ± 2.00 pF, (1.32 ± 0.00) × 108 S/m, and 1,988.540 ± 0.500, respectively. Furthermore, the YCaBCO-900-eggshell had electrical properties (capacitance, conductivity, and dielectric constant values) higher than those of YCaBCO-900-commercial grade measured under the same conditions. The YCaBCO-900-com grade had capacitance of 8,225.75 ± 0.73 pF, electrical conductivity of (1.40 ± 0.01) × 108 S/m, and dielectric constant of 1,874.59 ± 0.17, respectively. Therefore, eggshell is an alternative dielectric material useful for doping in yttrium barium copper oxide (YBCO) to form YCaBCO, thus causing an increase in its electrical properties. The obtained superconductor is a candidate that could be applied in many industries.

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14

Brown, Alan S. "Maglev Goes to Work." Mechanical Engineering 128, no. 06 (June 1, 2006): 39–41. http://dx.doi.org/10.1115/1.2006-jun-4.

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This article discusses various features of a mixer that proves to be advantageous for pharmaceutical market. Central Japan Railway Co. has tested the first-ever maglev train using high-temperature superconductors; the technology that is still a long way from practical commercialization. Instead, LevTech Inc., a Lexington, Ky., startup is using yttrium-barium-copper oxide superconductors to suspend impellers in mixers and pumps for the bioprocessing and pharmaceutical industry. The LevTech mixer's cassette holds six superconducting magnets, which suspend and lock into place an impeller that can be isolated in a pre-sterilized mixing bag. Rotating the cassette turns the impeller, which stirs the biochemicals inside the sealed bag. According to JR Central, superconductors have certain advantages over conventional electromagnets. First, they are much lighter. This improves railcar acceleration, speed, and payload; they also use less energy and more importantly, though, their 1 Tesla magnetic fields can lift a train 3 to 4 inches off the track, compared to 0.3 to 0.4 inch achieved with ordinary electromagnets.

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15

BRINKMANN, D. "ChemInform Abstract: Probing the Electronic Structure of Yttrium Barium Copper Oxide Superconductors by Copper, Oxygen, and Barium NQR and NMR." ChemInform 25, no. 2 (August 19, 2010): no. http://dx.doi.org/10.1002/chin.199402339.

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16

Curtiss, L. A., T. O. Brun, and D. M. Gruen. "Valence fluctuations in the (yttrium barium copper oxide), YBa2Cu3O7-x superconductor." Inorganic Chemistry 27, no. 8 (April 1988): 1421–25. http://dx.doi.org/10.1021/ic00281a025.

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17

Holland, Gary F., and Angelica M. Stacy. "Physical properties of the quaternary yttrium barium copper oxide superconductor (YBa2Cu3O7)." Accounts of Chemical Research 21, no. 1 (January 1988): 8–15. http://dx.doi.org/10.1021/ar00145a002.

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18

Srinivasan, G., Guo-Mei Wu, and T. T. Srinivasan. "Surface Resistance at Microwave Frequencies in Transition Metal Ion Substituted Yttrium Barium Copper Oxide Superconductors." physica status solidi (a) 122, no. 1 (November 16, 1990): 355–59. http://dx.doi.org/10.1002/pssa.2211220134.

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19

Srinivasan, R., V. Sankaranarayanan, C. K. Subramaniam, Prakash Fortunata Rajam, S. Kasiviswanathan, Vijayashree Radhakrishnan, H. Krishnan, U. V. Varadaraju, and G. V. Subba Rao. "Resistivity, thermopower and single-particle tunneling studies on some zinc-doped yttrium barium copper oxide superconductors." Phase Transitions 19, no. 1-3 (November 1989): 87–95. http://dx.doi.org/10.1080/01411598908242383.

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20

James, Patrick M., Eric J. Thompson, and Arthur B. Ellis. "Selective leaching of copper and barium from the yttrium barium copper oxide (YBa2Cu3O7-x) superconductor by chelating diamines." Chemistry of Materials 3, no. 6 (November 1991): 1087–92. http://dx.doi.org/10.1021/cm00018a026.

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21

Cava, R. J., and B. Batlogg. "Superconductivity at High Temperatures Without Copper: Ba1-xKxBiO3." MRS Bulletin 14, no. 1 (January 1989): 49–52. http://dx.doi.org/10.1557/s0883769400053902.

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Before the pioneering work of Bednorz and Müller in finding superconductivity near 30 K in lanthanum-barium-copper oxide,. oxide superconductors were well known, but perhaps not fully appreciated. Most anomalous among those superconductors was the perovskite structure material BaPb0.75Bi0.25O3, with a superconducting transition temperature (Tc) of 12 K2 and a surprisingly low density of states at the Fermi level. The increases in Tc for copper-oxide-based materials continue to generate worldwide excitement, but from both a chemical and theoretical point of view, high Tc superconductivity observed in a noncopper containing material is also of considerable interest.Recently we found that the simple cubic perovskite compound Ba0.6K0.4BiO3 displays a superconducting transition temperature near 30K—a Tc considerably higher than that of conventional superconductors and surpassed only by copper containing compounds. This material is in stark contrast to the now well-known copper oxides for two reasons: (1) superconductivity occurs within the framework of a three dimensionally connected bismuth-oxygen array (and not a 2-d array as in the Cu-O based compounds) and: (2) there are no magnetic fluctuations present in the chemical system, either in the superconductor itself or in the nonsuperconducting end member compound, eliminating the possibility that the high Tc might be caused by magnetic interactions. The parent compound BaBiO3 is, however, of considerable interest due to the presence of a structurally frozen charge disproportionation of the bismuth atoms, considered by many to be the electronic equivalent of the antiferromagnetism observed in the nonsuperconducting cuprate host compounds.The ideal undistorted perovskite ABO3 structure consists of a regular array of equally dimensioned BO6 octahedra sharing all corner oxygens with neighboring equivalent octahedra, with 180° B-O-B angles.

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22

Xu, Gong Qin, Xiao Wei Chen, and Xing Yu Mao. "Possible Ferromagnetism in YCuO System." Solid State Phenomena 298 (October 2019): 181–85. http://dx.doi.org/10.4028/www.scientific.net/ssp.298.181.

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polycrystalline CuxYyOz are made through solid state reaction. Ferromagnetism is found in this YCuO system at room temperature. The ferromagnetism quite probably originates from Cu2Y2O5 , the Copper Yttrium Oxide. The average magnetic moment per Cu2+ is estimated to be 0.04μB. Itinerant electron magnetism is a rational explaination for the observed ferromagnetism. The experiment shows that the excessive amount of Cu may lead more defects and further distortion in the lattice and decrease the exchange interaction. This reminds us that the Copper Yttrium Oxide is a substance not only should be avoided in fabricating YBCO superconductors but also should be considered as a potential substance of magnetic semiconductor.

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23

Flores Cano, Diego Alberto, Anais Roxana Chino Quispe, Renzo Rueda Vellasmin, Joao Andre Ocampo Anticona, Juan Carlos González, and Juan Adrián Ramos Guivar. "Fifty years of Rietveld refinement: Methodology and guidelines in superconductors and functional magnetic nanoadsorbents." Revista de Investigación de Física 24, no. 3 (December 7, 2021): 39–48. http://dx.doi.org/10.15381/rif.v24i3.21028.

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The Rietveld refinement method has taken high relevance since its creation. Nowadays, it is an useful tool in many fields of industry, materials science, and technology. For these reasons, it becomes a need for scientists and engineers whom pretend to use it for proper analysis of their materials. However, the initiation in the method can be slow, taking into account the accelerated rhythm of the research and economic demands. Thus, this work is an intend to fulfill this hole, providing the basic foundations and methodology of the Rietveld refinement in a brief way, this along with the results of its application in superconducting samples of Yttrium Barium Copper Oxide and magnesium diboride, and functional magnetic nanoadsorbents of maghemite and a multiphasic composite (iron oxide, hydroxyapatite and secondary phases). In the process, an in-detail protocol was designed and provided. It was concluded that the samples were successfully refined and that this work represents a fast introduction to the Rietveld method for which beginners can obtain good results while making correct interpretations ofthe whole refinement process.

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24

Leese, Rebecca J., Atanas Ivanov, and Hari Babu-Nadendla. "The Potential to Machine Superconductors with Electrochemical Machining." Journal of Multiscale Modelling 07, no. 01 (March 2016): 1640001. http://dx.doi.org/10.1142/s1756973716400011.

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Superconductors (SCs), such as gadolinium barium copper oxide, are brittle ceramics which are very difficult to machine conventionally due to the easy propagation of cracks. The cracks formed during conventional machining destroy the superconductive properties of the material. As a result a new method to machine ceramic SCs is needed. In this paper, polarization experiments were conducted in various nonaqueous salt electrolytes to determine whether electrochemical machining (ECM) is a suitable method for machining gadolinium barium copper oxide with silver inclusions (GdBCO-Ag) for the first time. Sodium chloride in formic acid proved to be the best electrolyte for this application with higher dissolution rates and achieving a better surface finish. It was noted that GdBCO-Ag dissolved at higher rates in NaCl in formic acid than in other salt-solvent systems.

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25

Zhou, Ji Ping, and John T. McDevitt. "Corrosion reactions of yttrium barium copper oxide (YBa2Cu3O7-x) and thallium barium calcium copper oxide (Tl2Ba2Ca2Cu3O10+x) superconductor phases in aqueous environments." Chemistry of Materials 4, no. 4 (July 1992): 953–59. http://dx.doi.org/10.1021/cm00022a036.

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26

Doverspike, K., C. R. Hubbard, R. K. Williams, K. B. Alexander, J. Brynestad, and D. M. Kroeger. "Anisotropic thermal expansion of the 1:2:4 yttrium barium copper oxide superconductor." Physica C: Superconductivity 172, no. 5-6 (January 1991): 486–90. http://dx.doi.org/10.1016/0921-4534(91)90218-n.

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27

Emeakaroha, Tochukwu, Floyd James, and Abebe Kebede. "Enhancement of Critical Current Density of Yttrium Barium Copper Oxide Thin Films by Introducing Nano dimensional Cerium Oxide Defects." Applied Physics Research 10, no. 6 (November 30, 2018): 109. http://dx.doi.org/10.5539/apr.v10n6p109.

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The critical current density, Jc  has been the most important parameter used in the design and engineering of effective devices which is one of the implementation of high temperature superconductors (HTSC). In this work, an effort has been made to further improve the critical current density of YBa2Cu3O7-x (YBCO) thin films by preventing the magnetic flux line lattice against the Lorentz force by pinning it in place with the aid of nano-dimensional defects. These defects were generated by distributing nano sized CeO2 islands after YBCO layer was created on LaAlO3 substrates perpendicular to the film using pulsed laser deposition (PLD) technique. Three samples with buffer layers of CeO2 were prepared. CeO2 with 50 pulses, 100 pulses and 150 pulses, after each 1000 pulses of YBCO were prepared five layers for each of the samples. The structural characterization of YBCO/CeO2 and YBCO pristine films were carried out using x-ray diffraction (XRD) and scanning electron microscopy (SEM). Superconducting proprieties were measured using a vibrating sample magnetometer (VSM). Jc  for the pure YBCO and the YBCO/CeO2 films were calculated from magnetization (M) versus Field (H) loops using Bean’s model. Jc  for the 50 pulses of YBCO/CeO2 films was found to be increased slightly by an order of magnitude of about 40% with respect to those of YBCO films without the nano dimensional defects.

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28

Masiakowski, Jerzy T., Micky Puri, and Larry Kevan. "Analysis of the low-field microwave absorption line shape differences in yttrium barium copper oxide (YBa2Cu3Ox) and bismuth strontium calcium copper oxide (Bi2Sr2CaCu2Ox) superconductors." Journal of Physical Chemistry 95, no. 3 (February 1991): 1393–96. http://dx.doi.org/10.1021/j100156a066.

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29

Kini, Aravinda M., Urs Geiser, Huey Chuen I. Kao, K. Douglas Carlson, Hau H. Wang, Marilyn R. Monaghan, and Jack M. Williams. "High-Tc superconductors: selective preparation and characterization of tetragonal and orthorhombic (93 K superconductor) phases of yttrium barium copper oxide (YBa2Cu3O7-x)." Inorganic Chemistry 26, no. 12 (June 1987): 1834–36. http://dx.doi.org/10.1021/ic00259a004.

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30

González, Luz E., Lina M. Segura-Gutierrez, John E. Ordoñez, Gustavo Zambrano, and John H. Reina. "A Multichannel Superconductor-Based Photonic Crystal Optical Filter Tunable in the Visible and Telecom Windows at Cryogenic Temperature." Photonics 9, no. 7 (July 12, 2022): 485. http://dx.doi.org/10.3390/photonics9070485.

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We design and evaluate the performance of a one-dimensional photonic crystal (PhC) optical filter that comprises the integration of alternating layers of a barium titanate ferroelectric (BaTiO3) and an yttrium oxide dielectric (Y2O3), with a critical high-temperature superconductor defect, yttrium–barium–copper oxide (YBa2Cu3O7−X), resulting in the (BTO/Y2O3)N/YBCO/(Y2O3/BTO)N multilayered nanostructure array. Here, we demonstrate that such a nanosystem allows for routing and switching optical signals at well-defined wavelengths, either in the visible or the near-infrared spectral regions—the latter as required in optical telecommunication channels. By tailoring the superconductor layer thickness, the multilayer period number N, the temperature and the direction of incident light, we provide a computational test-bed for the implementation of a PhC-optical filter that works for both wavelength-division multiplexing in the 300–800 nm region and for high-Q filtering in the 1300–1800 nm range. In particular, we show that the filter’s quality factor of resonances Q increases with the number of multilayers—it shows an exponential scaling with N (e.g., in the telecom C-band, Q≈470 for N=8). In the telecom region, the light transmission slightly shifts towards longer wavelengths with increasing temperature; this occurs at an average rate of 0.25 nm/K in the range from 20 to 80 K, for N=5 at normal incidence. This rate can be enhanced, and the filter can thus be used for temperature sensing in the NIR range. Moreover, the filter works at cryogenic temperature environments (e.g., in outer space conditions) and can be integrated into either photonic and optoelectronic circuits or in devices for the transmission of information.

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31

Gyurov, G., I. Khristova, P. Peshev, and M. V. Abrashev. "Preparation of a calcium-substituted copper-rich yttrium barium copper oxide superconductor from a spray-dried nitrate precursor." Materials Research Bulletin 28, no. 10 (October 1993): 1067–74. http://dx.doi.org/10.1016/0025-5408(93)90145-4.

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32

LIPPMAA, E., E. JOON, I. HEINMAA, A. VAINRUB, V. MIIDEL, A. MILLER, I. F. SCHEGOLEV, I. FURO, and L. MIHALY. "ChemInform Abstract: Copper NMR and NQR Studies of the Yttrium Barium Copper Oxide ( YBa2Cu3O7-x) High Tc Superconductor." ChemInform 22, no. 10 (August 23, 2010): no. http://dx.doi.org/10.1002/chin.199110341.

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33

Yang, K. N., Y. D. Dalichaouch, J. M. Ferreira, R. R. Hake, B. W. Lee, J. J. Neumeier, M. S. Torikachvili, H. Zhou, and M. B. Maple. "HighTcMagnetic Superconductors in Rare Earth (R) Barium Copper Oxide RBa2Cu3O7-δ." Japanese Journal of Applied Physics 26, S3-2 (January 1, 1987): 1037. http://dx.doi.org/10.7567/jjaps.26s3.1037.

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34

Lee, Haigun, and Haiwoong Park. "Synthesis of Melted Yttrium Barium Copper Oxide-0.325Ag Superconductors Contained in a Solid Silver Cladding at Reduced Oxygen Partial Pressures." Japanese Journal of Applied Physics 42, Part 1, No. 11 (November 10, 2003): 6841–47. http://dx.doi.org/10.1143/jjap.42.6841.

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35

Garbauskas, M. F., R. H. Arendt, and J. S. Kasper. "Single-crystal x-ray structure of the high-temperature superconductor barium yttrium copper oxide (Ba2YCu3O7-x)." Inorganic Chemistry 26, no. 19 (September 1987): 3191–93. http://dx.doi.org/10.1021/ic00266a026.

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36

Puri, Micky, Jerzy T. Masiakowski, Sean Marrelli, John Bear, and Larry Kevan. "Relationship of low-field microwave absorption to the surface area and sample shape of yttrium barium copper oxide (YBa2Cu3O7-.delta.) superconductors." Journal of Physical Chemistry 94, no. 15 (July 1990): 6094–99. http://dx.doi.org/10.1021/j100378a084.

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37

Antončík, Filip, Ondřej Jankovský, Tomáš Hlásek, and Vilém Bartůněk. "Nanosized Pinning Centers in the Rare Earth-Barium-Copper-Oxide Thin-Film Superconductors." Nanomaterials 10, no. 8 (July 22, 2020): 1429. http://dx.doi.org/10.3390/nano10081429.

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Since the discovery of high-temperature superconductivity, significant progress in the fabrication of REBCO-based (Rare Earth Barium Copper mixed Oxides) thin-films superconductors has been achieved. In our review, we described the approaches and possibilities of the improvement of superconducting properties by the introduction of nanosized pinning centers. We focused on the synthesis and viability of the material for artificial pinning centers and methods used for the introduction of the pinning centers into superconducting REBCO-based thin-films. This article summarizes available materials and procedures regardless of the financial cost of the individual method. According to available literature, the most significant superconducting REBCO tapes can be obtained when a combination of 1D and 0D nanoparticles are used for nanoscale pinning.

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Volosatova, V. S., A. S. Kuz'mina, and Mikhail P. Kuz'min. "The Impact of Ferro-and Superparamagnetic Nickel Particles on the Magnetism of YBCO Superconducting Ceramics." Materials Science Forum 1052 (February 3, 2022): 92–97. http://dx.doi.org/10.4028/p-zzp34o.

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The article examines the effect of nickel nanoparticles on the magnetic properties of the YBCO superconductor. The ceramics were obtained by solid-phase synthesis using yttrium oxide, copper (II) oxide, and barium carbonate with the addition of carbon nanotubes "Taunite" of different concentrations (0, 20, 50, 70, 100 mg). Magnetic studies have demonstrated that ferromagnetism and superparamagnetism are both observed in the samples, which can be explained by the presence of nickel particles. The dependences of the magnetization in the applied magnetic field of the sample without the addition of the carbon nanotubes "Taunite" have a paramagnetic course, and their slope monotonically increased with decreasing temperature. The coercive force of the samples and the value of the magnetic moment has been determined to increase upon the decrease in temperature. The high homogeneity of the heterostructures has been demonstrated in the graphs of FC/ZFC explained by the uneven distribution of nickel nanoparticles, which do not integrate into the crystal lattice and, due to the long-range order of interaction, do not make a strong contribution to the magnetization.

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39

Xia, Yajun, Yuntao Song, Tao Ma, Jinxing Zheng, Huajun Liu, Fang Liu, and Meng Song. "Design and Performance Tests of a Fault Current-Limiting-Type Tri-Axial HTS Cable Prototype." Electronics 11, no. 8 (April 14, 2022): 1242. http://dx.doi.org/10.3390/electronics11081242.

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Current-limiting superconducting cable uses the quench resistance of superconductor under short-circuit current to improve the short-circuit impedance of the system. In this paper, the design of current-limiting 10 kV three-phase tri-axial superconducting cable is studied. The design methods of cable conductor layer, insulation layer and current-limiting characteristics are given, and one 5 m-long sample is fabricated for testing. The sample is made of stainless-steel-reinforced yttrium barium copper oxide (YBCO) tape, with an expected rated current of 2.5 kA and rated voltage of 10 kV. The test results show that the designed cable can transmit a maximum AC current of 3.0 kA at 77 K. The cable has passed the power frequency withstand voltage, partial discharge and lightning impulse tests. The current limiting characteristics under the action of DC pulse current show that the cable can quickly quench and produce resistance, and the corresponding equivalent resistance value also changes along with current amplitude and duration.

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Zheng, Jun, Yan Feng Gou, Da Bo He, Rui Xue Sun, and Zi Gang Deng. "Stable Levitation Performance of Bulk High Temperature Superconductor Magnet in Applied Magnetic Fields." Materials Science Forum 787 (April 2014): 436–41. http://dx.doi.org/10.4028/www.scientific.net/msf.787.436.

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Bulk high temperature superconductor magnet (HTSCM) has been considered to get the better stable levitation in applied magnetic field which is not the original field-cooling magnetization (FCM) field in this paper. The vibration disturbance experiments firstly showed that a permanent magnet (PM) can suspend stably under a bulk Yttrium Barium Copper Oxide (YBCO) HTSCM. This implies that the stable levitation of one single bulk HTSCM is able to realize in the other magnetic field even from one single small PM due to the re-magnetization effect. Secondly, it is found that the HTSCM with more trapped flux produced larger guidance forces and smaller repulsion levitation forces compared with the well-recognized FCM condition of the30mm field-cooling height by the permanent magnet guideway (PMG). Especially, the HTSCM with the 0.349T trapped field achieved a maximum 9.8N guidance force, which is over impressive 7 times than the conventional FCM condition. So, it is feasible to introduce the bulk HTSCM into the HTS Maglev transportation system because this pre-magnetization method of the onboard superconductor bulks is not only helpful to improve the levitation capability and stability, but also enhance the dynamic property above the practical PMG.

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41

Pedrazzini, Stella, Andrew J. London, Baptiste Gault, David Saxey, Susannah Speller, Chris R. M. Grovenor, Mohsen Danaie, Michael P. Moody, Philip D. Edmondson, and Paul A. J. Bagot. "Nanoscale Stoichiometric Analysis of a High-Temperature Superconductor by Atom Probe Tomography." Microscopy and Microanalysis 23, no. 2 (January 31, 2017): 414–24. http://dx.doi.org/10.1017/s1431927616012757.

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AbstractThe functional properties of the high-temperature superconductor Y1Ba2Cu3O7−δ(Y-123) are closely correlated to the exact stoichiometry and oxygen content. Exceeding the critical value of 1 oxygen vacancy for every five unit cells (δ>0.2, which translates to a 1.5 at% deviation from the nominal oxygen stoichiometry of Y7.7Ba15.3Cu23O54−δ) is sufficient to alter the superconducting properties. Stoichiometry at the nanometer scale, particularly of oxygen and other lighter elements, is extremely difficult to quantify in complex functional ceramics by most currently available analytical techniques. The present study is an analysis and optimization of the experimental conditions required to quantify the local nanoscale stoichiometry of single crystal yttrium barium copper oxide (YBCO) samples in three dimensions by atom probe tomography (APT). APT analysis required systematic exploration of a wide range of data acquisition and processing conditions to calibrate the measurements. Laser pulse energy, ion identification, and the choice of range widths were all found to influence composition measurements. The final composition obtained from melt-grown crystals with optimized superconducting properties was Y7.9Ba10.4Cu24.4O57.2.

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Cooke, D. W., H. Rempp, Z. Fisk, J. L. Smith, and M. S. Jahan. "Luminescent properties of x-irradiated rare-earth-doped barium copper oxides." Journal of Materials Research 2, no. 6 (December 1987): 871–75. http://dx.doi.org/10.1557/jmr.1987.0871.

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Thermally stimulated luminescence (TSL) of x-ray-induced defects in R-Ba–Cu–O (R = Gd, Ho, and Eu) has been measured. In the interval 25–400°C, Ho- and Eu-doped samples exhibit similar TSL with peaks at 65, 135, and 185°C. The GdBa2Cu3Ox has, in addition to the three aforementioned peaks, a maximum at 310°C. All TSL peaks are attributed to recombination of F+s – and F−s center electrons with Vs-type holes, requiring typical thermal activation energies 0.5–1.0 eV. Spectral emission data support this conclusion. Irreversible quenching of TSL is found to occur in each sample. It is postulated that adsorbed oxygen molecules interact with radiation-induced F+s and Fs centers to produce O−2 and O2−2 molecular ions, respectively, thereby reducing the surface oxygen vacancy concentration and quenching the luminescence. In addition to activation energies, other TSL parameters are extracted from the data. It is suggested that surface TSL in these oxide superconductors is independent of rare-earth dopant.

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43

Masiakowski, Jerzy T., Micky Puri, and Larry Kevan. "Complications in the measurement of the magnetic field penetration depth in yttrium barium copper oxide (YBa2Cu3Ox) and bismuth strotium calcium copper oxide (Bi2Sr2CaCu2Ox) superconductors by electron spin resonance line broadening of surface paramagnetic probes." Journal of Physical Chemistry 95, no. 22 (October 1991): 8968–72. http://dx.doi.org/10.1021/j100175a099.

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44

Zimmerman, Jeffrey A., Charles E. Otis, and William R. Creasy. "Morphology and reactivity of ions and cluster ions produced by the laser ablation of yttrium barium copper oxide (YBa2Cu3O7-.delta.) superconductor." Journal of Physical Chemistry 96, no. 4 (February 1992): 1594–97. http://dx.doi.org/10.1021/j100183a021.

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45

Manthiram, A., J. S. Swinnea, Z. T. Sui, H. Steinfink, and J. B. Goodenough. "The influence of oxygen variation on the crystal structure and phase composition of the superconductor yttrium barium copper oxide (YBa2Cu3O7-x)." Journal of the American Chemical Society 109, no. 22 (October 1987): 6667–69. http://dx.doi.org/10.1021/ja00256a019.

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46

Goguel, Reiner. "Fe(III)/Fe(II) separation by solvent extraction for the determination of oxygen stoichiometry in yttrium barium copper oxide superconductor materials." Fresenius' Journal of Analytical Chemistry 336, no. 4 (1990): 311–15. http://dx.doi.org/10.1007/bf00331389.

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47

Jiajiong, Xiong, Gu Binglin, and He Yusheng. "Research in China on High Tc Superconductors." MRS Bulletin 14, no. 4 (April 1989): 34–42. http://dx.doi.org/10.1557/s0883769400055044.

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Since the discovery by Karl Alex Muller and Johannes Georg Bednorz (IBM Zurich) in January 1986 that an oxide of barium, lanthanum and copper might be superconducting at temperatures up to 35 K, the superconducting transition temperature has jumped to 125 K in only two years. A great tide of high Tc superconductor exploration has swept across the world. Like their counterparts in other countries, Chinese scientists also stood in the frontline of this revolution.When Prof. Zhao Zhongxian obtained Bednorz and Müller's paper in September 1986, he thought their ideas were reasonable. A team at the Institute of Physics, Academia Sinica was then organized to search for high Tc materials. In December 1986, Zhao and his colleagues successfully obtained superconducting samples of Sr0.25La4.75Cu5Ox with onset temperature Tcon 48.6 K and Ba0.5La4.5Cu5Ox with Tcon = 46.3 K (Figure 1). This occurred only a few days after the announcement of the confirmation of superconductivity by diamag-netic observation from Japan. These were the highest records for superconducting transition temperature Tcon in the world at that time. Moreover, a sign of superconductivity with Tc0 (zero resistivity) around 70 K was also observed in some La-Ba-Cu-O samples. Because these samples were unstable, however, the Tc decreased after several days storage in air. Since then Zhao and his colleagues have searched for materials with higher Tc by using various compositions and substitutions, different sintering processes, and heat treatments.

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48

Lee, Haigun, Haiwoong Park, and Dokyol Lee. "Synthesis of yttrium barium copper oxide-0.325Ag superconductors via intermediate precursor with overall composition Y:Ba:Cu:0=l:2:3:Y, Y>7 produced by high-energy attrition milling." Metals and Materials 6, no. 5 (September 2000): 473–89. http://dx.doi.org/10.1007/bf03028138.

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49

Tomita, Hisayo, Tomoko Goto, Shigetaka Shimada, and Kiyohisa Takahashi. "Solution spinning of a high-Tc oxide superconductor: 5. The influence of yttrium and barium ions on the poly(vinyl alcohol)-copper(II) complex." Polymer 37, no. 7 (March 1996): 1071–77. http://dx.doi.org/10.1016/0032-3861(96)80831-7.

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50

Haubner, Michal, Patrick Krkotić, Catarina Serafim, Valentine Petit, Vincent Baglin, Sergio Calatroni, Bernard Henrist, Artur Romanov, Teresa Puig, and Joffre Gutierrez. "Electron Beam Characterization of REBCO-Coated Conductors at Cryogenic Conditions." Applied Sciences 13, no. 5 (February 21, 2023): 2765. http://dx.doi.org/10.3390/app13052765.

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Particle accelerators with superconducting magnets operating at cryogenic temperatures use a beam screen (BS) liner that extracts heat generated by the circulating bunched charge particle beam before it can reach the magnets. The BS surface, commonly made of high–conductivity copper, provides a low impedance for beam stability reasons, low secondary electron yield (SEY) to mitigate the electron–cloud (EC) effect, and low electron–stimulated desorption yield (ESD) to limit the dynamic pressure rise due to EC. Rare–earth barium copper oxide (REBCO) high–temperature superconductors (HTSs) recently reached technical maturity, are produced as coated conductor tapes (REBCO–CCs), and will be considered for application in future colliders to decrease the BS impedance and enable operation at around 50 K, consequently relaxing the cryogenic requirements. Aside from HTS properties, industry–grade REBCO–CCs also need qualification for EC and dynamic vacuum compatibility under accelerator–like conditions. Hence, we report the SEY and ESD measured at cryogenic temperatures of 12 K under low–energy electron irradiation of 0–1.4 keV. We also verify the sample compositions and morphologies using the XPS, SEM, and EDS methods. The energy and dose dependencies of ESD are comparable to those of technical–grade metals and one sample reached SEYMAX = 1.2 after electron conditioning.

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