Improvement of YBa2Cu3O7−<i>x</i> thick films by doping with silver

Miller, Joseph H.; Holder, S. L.; Hunn, John D.; Holder, G. N.

doi:10.1063/1.101518

Cited by 53 publications

(9 citation statements)

References 29 publications

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“…It can be seen from table 1, that the orthorhombicity of Ag doped YBCO is mostly unchanged with Ag addition. This is in agreement with earlier reports [6,7]. Our XRD results undoubtedly prove that the studied YBCO+Ag x samples are of reasonably good quality.…”

Section: Methodssupporting

confidence: 93%

“…One of the effective ways to minimize the grain boundary area is to increase the size of superconducting grains. Addition of Ag in various high T c cuprate oxide superconductors (HTSc) has resulted in improving the superconducting performance of these systems [6][7][8][9][10]. In this shot note, we present the results of XRD, microstructure (SEM) and detailed AC susceptibility on pure and Ag added YBCO superconducting samples.…”

Section: Introductionmentioning

confidence: 99%

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AC Susceptibility Study of Superconducting YBa2Cu3O7:Ag x Bulk Composites (x=0.0–0.20): The Role of Intra and Intergranular Coupling

Rani

Jha

Awana

2013

J Supercond Nov Magn

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We report the effect of silver addition on superconducting performance of bulk YBCO (YBa 2 Cu 3 O 7 ) superconductor. All the studied samples are prepared by conventional solid-state reaction method. Rietveld fitted X-ray diffraction data confirmed the single phase formation for all the studied samples. Detailed AC susceptibility measurements as a function of driven AC amplitude (1Oe-17Oe) of these samples revealed the enhancement of grains coupling with increasing Ag content in YBCO+Ag x composite system. 10wt% Ag added YBCO superconductors exhibited the optimum inter granular coupling. The Scanning Electron Microscopy (SEM) observations indicate an increase in the grains connectivity in terms of narrow grain boundaries for doped samples.The average grain size is found to increase with Ag doping. It is concluded that limited addition of Ag in bulk YBCO superconductor significantly improves the grains coupling and as result optimum superconducting performance. YBCO+Ag composites could prove to be potential candidates for bulk superconducting applications of the studied high T c system. Nos. 74.72.Gh, 74.25.fc, 74.25.Ha PACS

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Section: Methodssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

AC Susceptibility Study of Superconducting YBa2Cu3O7:Ag x Bulk Composites (x=0.0–0.20): The Role of Intra and Intergranular Coupling

Rani

Jha

Awana

2013

J Supercond Nov Magn

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“…Also, silver improves the grain growth and helps to obtain a better grain orientation, lowering the electrical resistance in the normalstate [8,9]. In a general manner, silver addition to Y-123 clearly enhances the process dominated by the weaklinks [10].…”

Section: Introductionmentioning

confidence: 94%

Effects of Ag addition on some physical properties of granular YBa2Cu3O7-δ superconductor

Azambuja¹,

Júnior²,

Jurelo³

et al. 2009

Braz. J. Phys.

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The effects of Ag addition on some physical properties of Y Ba 2 Cu 3 O 7−δ superconductor has been studied. The samples were produced by different routes and characterized by scanning electron microscopy, differential thermal analysis, thermogravimetric analysis, X-ray diffraction and nanoindentation. The superconducting properties were studied by dc magnetization and electrical resistivity measurements. The X-ray patterns revealed that all samples were polycrystalline and corresponded to the orthorhombic Y Ba 2 Cu 3 O 7−δ phase. However, for some samples, silver appears to be present within the grains. The superconducting properties were not significantly influenced by Ag addition. Hardness and elastic modulus were also obtained by instrumented indentation. Ag addition was found to be effective in improving the mechanical properties, probably by filling the pores in the grain boundaries. Hardness profiles indicated values between 3.1 and 3.4 GPa at deep tip penetration depths. The highest elastic modulus of 146 GPa was attained for samples prepared using Y 2 O 3 , BaCO 3 , CuO and Ag 2 O as precursors, while the lowest modulus (125 GPa) was obtained for the pure Y Ba 2 Cu 3 O 7−δ sample.

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“…[1][2][3][4][5][6][7][8][9][10][11][12] Although the intragranular critical current densities, J c approach the intrinsic values, the intergranular weak links still limit the current carrying capacity. 2,5,[13][14][15][16][17][18] Microstructure and granularity problems are the key issues of great interest. Here, we report high-resolution Auger electron spectroscopic ͑HRAES͒ results, and address the nature and thickness of the grain boundaries in laser ablated YBa 2 Cu 3 O 7Ϫ␦ thin films.…”

Section: ͓S0003-6951͑97͒03022-2͔mentioning

confidence: 99%

Enhanced Jc and improved grain-boundary properties in Ag-doped YBa2Cu3O7−δ films

Selvam

Seibt²,

Kumar

et al. 1997

Applied Physics Letters

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A large increase (∼8×) in critical current density, Jc, was achieved for in situ laser ablated YBa2Cu3O7−δ–Ag films. High-resolution Auger electron spectroscopic investigation indicates that the Ag-doped films are stoichiometric with a relatively low grain-boundary extension (8 nm) in contrast to undoped YBa2Cu3O7−δ films (32 nm). Further analysis suggests that the doped film contains a much lower silver content (<0.15 wt %) than in the target material (5 wt %). These observations are in excellent agreement with the temperature dependence of Jc, the room-temperature resistivity, and the surface resistance results. Thus, Jc enhancement in Ag-doped films can be attributed to their superior properties, viz., improved microstructure characteristics and the reduced resistive grain boundaries.

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Improvement of YBa2Cu3O7−x thick films by doping with silver

Cited by 53 publications

References 29 publications

AC Susceptibility Study of Superconducting YBa2Cu3O7:Ag x Bulk Composites (x=0.0–0.20): The Role of Intra and Intergranular Coupling

AC Susceptibility Study of Superconducting YBa2Cu3O7:Ag x Bulk Composites (x=0.0–0.20): The Role of Intra and Intergranular Coupling

Effects of Ag addition on some physical properties of granular YBa2Cu3O7-δ superconductor

Enhanced Jc and improved grain-boundary properties in Ag-doped YBa2Cu3O7−δ films

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