The synthesis and structural characterisation of Ag-Doped YBa2Cu3O7−δ

Taylor, C.R.; Greaves, C.

doi:10.1016/0921-4534(94)91651-9

Cited by 11 publications

(8 citation statements)

References 9 publications

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“…However, Behera et al reported a decrease of 5 K in T c against both x = 0.06, 0.12 dopant levels for YBa 2 Cu 3−x Ag x O y superconductors sintered also in air [10]. Our results are in agreement with those reported by Taylor and Greaves who also found a nondetrimental effect of the same Ag doping levels (x = 0.05, 0.10) on T c [11].…”

Section: Resistivity Measurementsupporting

confidence: 95%

“…Another reason for this increase may be the fact that Cu +2 atoms (r Cu +2 = 0.72 Å) were partly replaced by Ag + atoms with greater atomic radius, r Ag + = 1.26 Å. Our results are similar with those reported by both Behera et al [10] and Taylor and Greaves [11], who also found the oxygen content to decrease in YBa 2 Cu 3−x Ag x O y superconductors against the same doping levels (x = 0.05, 0.10). The oxygen content in the initial study was estimated by thermogravimetric analyses (TGA) and by iodometric titration in the latest one.…”

Section: Xrd Measurementsupporting

confidence: 94%

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Dependence of the Structural, Electrical and Magnetic Properties of YBa2Cu3O7−δ Bulk Superconductor on the Ag Doping

Yıldız

Kocabaş

Akyüz

2012

J Supercond Nov Magn

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The effects of Ag dopants on the superconducting properties of YBCO bulk samples, prepared under solidstate reaction method, have been studied by resistivitytemperature (ρ-T ), X-ray diffraction (XRD), scanning electron microscope (SEM), bulk density, AC susceptibility, DC magnetization measurements, and theoretical analysis. Small Ag substitutions (x ≤ 0.10) do not effect T c of pure YBa 2 Cu 3−x Ag x O 7−δ , while we observed small decreases of 1.5 K for larger doping levels (x ≥ 0.15). AC susceptibility measurements for sintered YBCO pellets have been performed as a function of temperatures at constant frequency and AC field amplitude in the absence of DC bias field. The critical current densities (J c ) have been estimated as a function of magnetic field from the magnetization data employing Bean's critical state model. The increase in Ag amount (x) in YBa 2 Cu 3−x Ag x O 7−δ (x ≥ 0.10) system effectively decreases the intragrain critical current density, which is attributed to the reduced connectivity between the grain boundaries. In the case of small additions (x = 0.05), Ag atoms fill partly the pores, leading better crystallization of the grains.

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Section: Resistivity Measurementsupporting

confidence: 95%

Section: Xrd Measurementsupporting

confidence: 94%

Dependence of the Structural, Electrical and Magnetic Properties of YBa2Cu3O7−δ Bulk Superconductor on the Ag Doping

Yıldız

Kocabaş

Akyüz

2012

J Supercond Nov Magn

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“…However, the variation is not considerably a large deviation. The variation in these physical parameters indicates that the Cu 2+ atoms of atomic radius [10-12] may be replaced by the Ag atoms of atomic radius, [10][11][12], which is in agreement with previous studies [13]. Moreover, another fact the Cu 2+ atoms may be partly replaced by atoms [10][11][12].…”

Section: Experimental Methodologysupporting

confidence: 87%

The influence of Ag doping on structrual and electrical resistivity properties of Y3Ba5Cu8O18 high temperature superconducting alloys

Puwanasingam¹,

Fernando²,

Ragel³

2019

J. Sc.

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This research paper describes the synthesis of a series of Y-based superconducting alloys doped with Ag oxide. The superconducting alloys were synthesized by Gholipour et al. (2012), Tavana et al. (2010) and Khosroabadi et al. (2014) using sol-gel reaction technique. In the present research superconducting alloys were synthesized by solid state reaction technique. These alloys were investigated by using X-ray diffraction pattern (XRD), Scanning Electron Microscope (SEM) image and the electrical resistivity, , measurements. The  measurements above room temperature of Y358 alloys shows metal behavior in the normal state. The YBCO alloy family was exposed having the CuO2 planes and the Cu-O chains. Increasing the number of the CuO2 planes and the position of the Cu-O chains have positive effects on the significance of the transition temperature in the Ybased alloys. The X-ray diffraction patterns were accepted by Joint Committee of Powder Diffraction Standards (JCPDD) database software, which the Ag ions substitute in symmetrical phase of the alloy. The replacement of the Ag ions in the CuO2 plane of symmetric phase has been associated with the Ag ions in the Y123 alloys, which replace in the Cu-O chain. The  of these alloys were measured employing four-probe point technique and the (T) curves agreed the transition temperature develops above 100 K.

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“…Due to its excellent chemical compatibility, the silver ion can be encountered into the Y-123 grains [7,13]. Yet, as copper and silver are from the same group of the periodic table, Ag atoms can substitute Cu (1) in the Y-123 grains and consequently many physical properties are affected by presence of microscopic granularity [14].…”

Section: Introductionmentioning

confidence: 99%

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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The synthesis and structural characterisation of Ag-Doped YBa2Cu3O7−δ

Cited by 11 publications

References 9 publications

Dependence of the Structural, Electrical and Magnetic Properties of YBa2Cu3O7−δ Bulk Superconductor on the Ag Doping

Dependence of the Structural, Electrical and Magnetic Properties of YBa2Cu3O7−δ Bulk Superconductor on the Ag Doping

The influence of Ag doping on structrual and electrical resistivity properties of Y<sub>3</sub>Ba<sub>5</sub>Cu<sub>8</sub>O<sub>18</sub> high temperature superconducting alloys

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

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