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Thesis (Ph.D) - University of Birmingham, School of Metallurgy and Materials.
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Download Second phase additions to superconducting YBCO thick films
However, there have been few experi- ments to examine the effect of second phase addition on melt-processed YBCO thick films .
In this paper, we have studied the superconducting properties of screen- printed YBCO thick films with BaSnO3 and ultrafine Sn particles additions.
palmbeach-jeans.com by: 1. YBCO film with different second phase additions. Sectored targets with o. sector of BGeO or a BSiO fixed on top of a YBCO target and premixed targets of 2, 4 vol.% BGeO were used to deposit ~ nm thick films.
Films were characterized by x-ray diffraction and the microstructures were studied by. YBa2Cu3O7-x (YBCO) films coated onto metallic substrates . A long established goal. of more than 15 years has been to understand the magnetic flux pinning mechanisms.
which allow films to maintain high current densities out to high magnetic fields .Cited by: Nov 01, · Many second phase additions to YBa 2 Cu 3 O 7−x (YBCO) films, in particular those that self-assemble into aligned nanorod and nanoparticle structures, enhance performance in self and applied fields.
Of particular interest for additions are Ba-containing perovskites that are compatible with palmbeach-jeans.com by: 6. Abstract For power applications of superconducting films, the critical current density (J c) and the thickness of the film (d) should be as high as palmbeach-jeans.com J c decreases with both thickness and magnetic field, artificial pinning centres in addition to natural ones are required to keep J c high.
The earliest cost-effective method used for introducing artificial pinning centres was the. Self-assembled artificial pinning centres in thick YBCO superconducting films View the table of contents for this issue, or go to the journal homepage for more Two other methods are building up a layered distribution of a second phase and homogeneous along the c-axis of YBCO.
In addition, for selected set of samples, a 2D self-assembly. 3 ACKNOWLEDGEMENT On the submission of my thesis report titled as “Synthesis and characterization of YBCO thick films”, I would like to thank our guide Prof D. Behera for his patience and his helpful discussion with me during the course of my work for the l year.
Significant increases in critical current density (Jc) and corresponding decreases in surface resistance (Rs) are reported when sintering regimes of YBCO thick films include a short period of melt texturing at temperatures in excess of the peritectic. The effect of making silver additions to the films significantly increases attainable palmbeach-jeans.com by: 4.
Abstract: Many second phase additions to YBa2Cu3O7−x (YBCO) films, in particular those that self-assemble into aligned nanorod and nanoparticle structures, enhance performance in self and applied fields.
Of particular interest for additions are Ba-containing perovskites that are compatible with palmbeach-jeans.com Second phase additions to superconducting YBCO thick films book 6.
Physics Superconducting YBCO Experiment revised Mr. Scofield Advanced Laboratory February 24, Page 6 of 7 Figure 3 Wiring diagram to measure film resistance using a lock-in amplifier.
While monitoring the film resistance with the lock-in, carefully slide the. The superconducting films of YBCO on substrate of single crystal SrTiO 3 or LaAlO 3 were successfully fabricated by either dc or rf magnetron sputtering.
Several results are given in this paper. The excellent superconductivity of the films is obtained on the substrate of SrTiO 3 single crystal, which has a surface parallel to ().
These films Author: Senzu Yang, Peiheng Wu, Zhengming Ji, Zhijian Sun, Yuan Li, Shiyuan Zhang, Guanghou Wang, Hongchai Z. Books. Publishing Support. Login. Self-assembled artificial pinning centres in thick YBCO superconducting films. P Mikheenko 1, J S Abell 1, A Sarkar 1, Two other methods are building up a layered distribution of a second phase and homogeneous incorporation of second phase inclusions from a compositional target.
In this paper, we Cited by: 5. Superconducting thick films of (Bi) on single-crystalline () MgO substrates have been prepared using a doctor-blade technique and a partial-melt process.
adhesion of the YBCO films with the substrates. The x-ray diffraction studies of the YBCO films developed on the Ba2REHtl) substrate showed a high degree of c-axis orientation and there was no evidence of the formation of any second phase within the precision of x-ray diffraction technique.
The YBCO thick films. Sep 19, · To form a superconducting YBCO phase, the film was reheat-treated at °C for 30 s in air followed by oxygen annealing at °C for 1 h. For heat-treatments performed under pressure, lower film porosity was obtained, and a higher crack density was also observed compared to films prepared without palmbeach-jeans.com by: 4.
Enhanced flux pinning in GdBaCuO bulk superconductors by Zr dopants even with a small amount of secondary phase addition. The YBCO microstructure is observed to separate into regions of high. PLATINUM ADDITIONS TO YBCO THICK FILMS IMPROVE CRITICAL CURRENT DENSITIES AND SUPERCONDUCTING PROPERTIES By J.
Langhorn School of Metallurgy and Materials, University of Birmingham Screen printed thick film technology is recognised as an inexpensive and effective means for the production of superconductors which have potential. materials on the substrate prior to the deposition of the superconducting thin film , used first for Thalium-based films , then on YBCO [4,5].
Later on other two approaches proved to be successful: bulding up a layered distribution of a second phase using a multilayer deposition (quasi-superlattices) , and, respectively, by distribution.
The high resistivity of YBCO grain boundaries is mainly attributed to the presence of solidified liquid phase and cracks at these boundaries. Using the liquid phase removal method, YBCO melt textured bars, over 10 cm in length and cm2 in cross-section, are processed with "clean" grain boundaries free of secondary phases and cracks.
film growth. In-situ high-T c superconducting films are superconducting when they are removed from the growth chamber. In-situ films are deposited onto a heated substrate. The presence of oxygen and substrate temperature of about oC to oC is essential for crystallization of tetragonal YBCO.
Contents VII REBCO Superconductors 70 REBCO Oxygen Stoichiometry and Texture 71 Disorder in the REBCO Lattice 73 Detection of Nonsuperconducting Second Phases (NSPs) 74 Penetration Depth and Through-Thickness Examination 75 Monitoring of the REBCO Formation Process 76 Bismuth Oxide Superconductors Many second phase additions to YBa2Cu3O7−x (YBCO) films, in particular those that self-assemble into aligned nanorod and nanoparticle structures, enhance performance in self and applied fields.
Of particular interest for additions are Ba-containing perovskites that are compatible with YBCO. In this report, we discuss the addition of Ba2YRuO6 to bulk and thick-film palmbeach-jeans.com by: 6. On nontextured substrates, YBCO superconducting thick films were fabricated using a simple screen-printing method, from Cu-free powders (Y2O3 and BaCO3).
However, the films have poor superconducting properties, such as the critical current density, Jc value due to the random orientation of the films.
In this work, we investigate the influence of substrate texture on superconducting Cited by: 1. second phase materials such as BaZrO 3 [5–7], BaSnO 3 , Y 2O 3 [9, 10] or rare-earth tantalates  to the YBCO source material to induce second phase growth. Recently, perovskite-based additions have gained renewed interest as a class of materials that can be incorporated into REBCO ﬁlms for dramatic improvements in the pinning palmbeach-jeans.com by: Sep 28, · Trudy J.
Gray has written: 'Second phase additions to superconducting YBCO thick films' Asked in Authors, Poets, and Playwrights What has the author Trudy J Morgan-Cole written.
the formation of nanocolumns and superconducting properties (Tc, Jc) of YBCO films. In In this study, second phase additions of BaGeO 3 (BGeO) and BaSiO 3 (BSiO) were.
Enhanced superconductivity of YBCO interfaces: origin of high critical temperature in layered superconductors S.S. Tinchev Institute of Electronics, Bulgarian Academy of Sciences, Tzarigradsko Chaussee 72, SofiaBulgaria E-mail: [email protected] Superconducting transition temperatures T c of the YBCO film surface and of.
Second-phase Mo 5 Si 3 additions to MoSi 2 result in decreased values for G and E, Magnetron sputtering was used to deposit superconducting YBCO thin films on four polycrystalline metal substrates. Yttrium-stabilized zirconia (YSZ) and silver were used as buffer layers. use of a liquid precursor has enabled deposition of micron-thick.
The YBCO+BSO films deposited on buffered metallic substrates showed improvements as seen on the single-crystal substrates, indicating that the BSO nano-additions can be introduced on polycrystalline buffer layers as used in coated conductors. Unlike BaZrO3, BSO seems to allow higher relative amounts of additions to YBCO without significantlyAuthor: P N Barnes, C Varanasi.
Superconducting thick films of the Y-Ba-Cu-O system prepared by screen-printing and sintering on different substrates were investigated to study the effect of the substrate material on the superconducting properties of the films. These properties were determined by carrying out structural studies using SEM, EPMA and XRD and by determining the electrical palmbeach-jeans.com by: 6.
Detailed investigation of superconducting films of YBa2Cu3O7-delta (YBCO) prepared from solution-based precursors have been performed. Two precursors have been compared in this study: the presently used trifluoroacetate (TFA) solution and a recently developed colloidal suspension containing nanoparticles of mixed oxide.
Detailed analyses of the evolution of microstructure and chemistry of the Cited by: 3. Article Synopsis. Screen printed thick film technology is recognised as an inexpensive and effective means for the production of superconductors which have potential applications in the electronics and microwave device industries.
Additions of the platinum group metals have been made to superconducting thick films of YBa 2 Cu 3 O 7-δ. Resistance of the Superconducting Material YBCO A Senior Project Presented to The Faculty of the Department of Physics California Polytechnic State University, San Luis Obispo, California Partial Fulfillment of the Requirements for the Degree Physics BS By Chris Safranski A brief overview of recent superconductivity research at NIST is presented.
Emphasis is placed on the new high-temperature oxide superconductors, though mention is made of important work on low-temperature superconductors, and a few historical notes are included. A process and composition of matter are provided and involve flux pinning in thin films of high temperature superconductive oxides such as YBCO by inclusion of particles including barium and a group 4 or group 5 metal, such as zirconium, in the thin palmbeach-jeans.com by: May 01, · 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 Author: Gao Yang Zhao, Huang Li Zhang, Ren Zhong Xue, Yuan Qing Chen, Li Lei.
phases (which determines the critical size of the second-phase nanoparticles, as described below for tantalate and niobate additions); whether the pinning phase incorporates all of the cations present in the superconductor phase (in which case there is a greater tendency for horizontal plate-like structures.
Feb 08, · Upward shift of the vortex solid phase in high-temperature-superconducting wires through high density nanoparticle addition Skip to main content Thank you for visiting palmbeach-jeans.com by: Temperature and Field Dependence of Magnetization Measured on a Grain Aligned Hg Samples.- Flux Pinning in Melt-Processed Ternary (Nd-Eu-Gd)Ba2Cu3Oy Superconductors with Second-Phase Addition.- Orientation Dependence of Magnetization Near ab Plane in Micron-Thick YBCO Films intermediate layer, 6 nm thick, between the YBCO film and YSZ substrate was observed by HREM and shown by EDS to be a Ba-enriched phase, possibly barium zirconate formed by a reaction.
In contrast, the YBCO-MgO interface was found to be sharp and free of any intermediate layers. INTRODUCTION Superconducting thin films of YBa2Cu+, (YBCO).
Superconducting Characteristics of Nd1+xBa2-xCu3Oy Thick Film by Liquid Phase Epitaxy.- Preparation of Intermediate Buffer Layer Between YBCO Film and YSZ Substrate.- Fabrication of Round Shape YBa2Cu3O7-x Single Crystal by Automatic Crystal Pulling.- BSCCO, TBCCO, and Other Type Superconductorswith the loss transition not ﬁnished at 77 K.
Films with super-conducting transitions this wide always have very low at 77 K ranging anywhere from to, from our experience. MgO also showed a second phase transition at tem-perature 70 K, indicating the ﬁlm quality has been degraded.
The effect of nanosize additions on properties are.Jun 27, · K. M. Nair is the editor of Advances and Applications in Electroceramics, publsihed by Wiley. Shashank Priya is the editor of Advances and Applications in Electroceramics, publsihed by Wiley. Quanxi Jia is the editor of Advances and Applications in Electroceramics, publsihed by Wiley.