Large domain growth of Ag-doped YBaCuO-system superconductor

Kang

et al. 2008

jjap

Nd-Ba-Cu-O (NdBCO) precursor powder composed primarily of NdBa 2 Cu 3 O 7−δ (Nd-123) and 15 mol% Nd 4 Ba 2 Cu 2 O 10 (Nd-422) containing 0.1 wt% Au has been prepared by spray drying and subsequent calcination for the fabrication of bulk melt-processed ceramics. The addition of Au results in the lowering of key process parameters, such as the peritectic melting point and solidification temperatures by up to 30 • C. Additional doping of Au/NdBCO with 5 wt% Ag 2 O lowers these values further and has enabled the successful nucleation and limited growth of single grains under both air and reduced oxygen atmospheres using undoped NdBCO as a seed. The advantage of this self-seeded melt growth technique is that it avoids the lattice mismatch that results from the conventional use of a MgO seed.

Section: Methodssupporting

confidence: 66%

Effect of Corrosion Inhibitor, Benzotriazole, in Cu Slurry on Cu Polishing

Kang

et al. 2008

jjap

“…However, it can be noted that the YBCO begins to crystallize at about 895 • C for YAg10, which means that the silver addition reduced the the crystallization temperature by 30 • C (or 3%). The peak at 954 • C presented by YAg10 is associated with the melting of metallic silver [35]. On the other hand, the endothermic peak at 1031 • C for YAg0 is due to a partial melting of YBCO and such a peak is shifted to 995 • C (or 3.5%)…”

Section: Resultsmentioning

confidence: 97%

Successful production of solution blow spun YBCO+Ag complex ceramics

Pessoa

Raine

Hampshire

et al. 2020

Ceramics International

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Physica Status Solidi (a)

“…On the other hand, Ag does not degrade the T c when substituted or added in the 123 structure 4. The effect of Ag doping has been widely investigated for Y‐123 system 6–13. These studies have shown that Ag addition lowers the phase formation temperature, increases the bulk density, improves the microstructure and mechanical properties, changes critical current density, and influences crystallization at the grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

Superconducting and microstructural properties of Mg_1−xAg_xB₂

Singh

Mohan

Kumar

et al. 2010

A systematic study on the effect of silver (Ag) doping in magnesium diboride (MgB 2 ) superconductor has been undertaken. A series of polycrystalline samples with composition Mg 1Àx Ag x B 2 (0 x 0.20) were synthesized by using the ''in situ'' solid state reaction method. All the samples were sintered at 850 8C for 2 h under the high purity argon flow. The room temperature X-ray diffraction (XRD), low temperature resistivity (r-T) measurements and field emission scanning electron microscopy (FE-SEM) were performed to explore the phase purity, superconducting transition temperature, and microstructural properties, respectively.The XRD patterns show that Ag doping leads to the formation of Mg-Ag phase. The relative intensity of Mg-Ag phase increases with increasing Ag content. The r-T measurement shows that superconducting transition temperature (T c ) decreases slightly with Ag doping. All the samples have T c between 38.5 K (x ¼ 0.00) and 37 K (x ¼ 0.20). The FE-SEM images have revealed hexagonal shaped grains with an average grain size between 0.20 and 0.50 mm.