ANNEALING EFFECTS ON STRUCTURAL AND SUPERCONDUCTING PROPERTIES OF MgB2/Fe WIRES

2004 ◽  
Vol 18 (16) ◽  
pp. 791-802 ◽  
Author(s):  
S. BALAMURUGAN ◽  
T. NAKAMURA ◽  
K. OSAMURA ◽  
I. MUTA ◽  
T. HOSHINO
Keyword(s):  
Interfacial Reaction ◽  
Annealing Time ◽  
Sintering Temperature ◽  
Ambient Pressure ◽  
Structural Features ◽  
Superconducting Properties ◽  
Annealing Effects ◽  
Significant Change ◽  
Rolled Wire ◽  
Powder In Tube

We report the results of annealing effects on structural and superconducting properties (Tc and Jc) of various MgB 2/ Fe wires that are produced by different conditions. Good quality superconducting MgB 2/ Fe wires are fabricated by the powder-in-tube (PIT) technique at ambient pressure. XRD data confirms that they are hexagonal MgB 2 structure. All the annealed samples show higher Tc values in the range of 34.6–38.4 K with Jc higher than the as-rolled wire. The annealed samples show significant change in the Jc values as well as in micro-structural features due to variable sintering temperature. On annealing at 1050°C for 10 min, we obtain the best quality sample with a Jc of 37.2 kA/cm 2 at 33.1 K and self-field with a maximum Tc of 38.4 K. Among the samples annealed at 1050°C for 5–20 min, the 20 min sample shows lower Jc. Longer annealing time (at 1050°C) reduced Jc, indicating a possible interfacial reaction between the Fe sheath and the MgB 2 core.

ANNEALING EFFECTS IN PIT-PROCESSED MgB2/SUS316 (STAINLESS STEEL) COMPOSITE WIRES

2005 ◽  
Vol 19 (16) ◽  
pp. 793-800
Author(s):  
S. BALAMURUGAN ◽  
K. HIGASHIKAWA ◽  
T. NAKAMURA ◽  
K. OSAMURA
Keyword(s):  
Stainless Steel ◽  
Ambient Pressure ◽  
Superconducting Transition ◽  
Annealing Conditions ◽  
Steel Wires ◽  
Annealing Effects ◽  
Zero Resistance ◽  
Steel Composite ◽  
Powder In Tube ◽  
Composite Wires

The MgB 2/ SUS316 (stainless steel) wires were fabricated by powder-in-tube (PIT) method using commercially available superconducting MgB 2 powder at ambient pressure, and the annealing effects on Tc as well as Jc were investigated. The as-rolled MgB 2/ SUS316 wire showed a zero-resistance superconducting transition temperature (Tc) at 33.4 K and a critical current density [Formula: see text] of 2.22 kAcm-2 at 18.4 K. In order to check the annealing effect, the different pieces of the as-rolled wires were annealed at various annealing conditions under Ar atmosphere in vacuum (60 cm Hg) sealed silica-tube. As compared to the MgB 2/ Fe wires, the annealing temperature and duration were lower and much shorter respectively, for the MgB 2/ SUS316 (stainless steel) wires. On annealing at 873 K for ~ 1 s, we obtained the best sample with a [Formula: see text] of 12.1 kAcm-2 at 16.9 K with a maximum Tc of 36.1 K. Longer annealing time (~ 10 s) above 873 K reduced the Tc as well as the Jc, indicating a possible chemical reaction between the MgB 2 cores and the sheath material.

Fabrication and superconducting properties of powder-in-tube processed MgB2 tapes

2002 ◽  
Vol 372-376 ◽  
pp. 1245-1247 ◽  
Author(s):  
A. Malagoli ◽  
V. Braccini ◽  
N. Scati ◽  
S. Roncallo ◽  
A.S. Siri ◽  
...  
Keyword(s):  
Superconducting Properties ◽  
Powder In Tube

scholarly journals Pressure-induced monotonic enhancement of Tc to over 30 K in the superconducting Pr0.82Sr0.18NiO2 thin films

2021 ◽  
Author(s):  
Ningning Wang ◽  
Mingwei Yang ◽  
Keyu Chen ◽  
Zhen Yang ◽  
Hua Zhang ◽  
...  
Keyword(s):  
Thin Films ◽  
Electrical Resistivity ◽  
Pressure Effect ◽  
Ambient Pressure ◽  
Strain Engineering ◽  
Superconducting Properties ◽  
Liquid Pressure ◽  
Infinite Layer ◽  
Effect Of Pressure ◽  
First Time

Abstract The successful synthesis of superconducting nickelate thin films with the highest Tc ~ 15 K has reignited great enthusiasms on this class of potential analogue to high-Tc cuprates suggested decades ago. To pursue higher Tc is always an important task in studying new superconductors. Here we report for the first time the effect of pressure on the superconducting properties of infinite-layer Pr0.82Sr0.18NiO2 thin films by measuring electrical resistivity under various pressures in a cubic anvil cell apparatus. We find that the onset of superconductivity, Tconset, can be enhanced monotonically from ~ 18 K at ambient pressure to ~ 31 K without showing signatures of saturation upon increasing pressure to 12.1 GPa in the presence of liquid pressure transmitting medium. This encouraging result indicates that the Tc of infinite-layer nickelates superconductors can be further raised up by applying higher pressures or strain engineering in the heterostructure films. In addition to the pressure effect, we also discussed the influence of stress/strain on the superconducting properties of the nickelate thin films.

SG and SSR approach in the preparation of precursors and influence on superconducting properties of Tl-1223 superconductors

2020 ◽  
Author(s):  
Ioseb Metskhvarishvili ◽  
T.E. LOBZHANIDZE ◽  
G.N. DGEBUADZE ◽  
B.G. BENDELIANI ◽  
M.R. METSKHVARISHVILI ◽  
...  
Keyword(s):  
Solid State ◽  
Ambient Pressure ◽  
Sol Gel ◽  
Heat Treatments ◽  
Superconducting Transition ◽  
Superconducting Properties ◽  
Step Method ◽  
Chemical Homogeneity ◽  
Wet Chemistry ◽  
Current Densities

Abstract The paper presents the comparative analysis of the Sol-gel (SG) and solid-state reaction (SSR) route for the synthesis of precursors for thallium-based superconductors. Samples were prepared a two-step method and by sealed quartz tube technique in ambient pressure. Heat treatments of precursors showed that to obtain high-purity precursors, without any carbonate contamination for SG methods is sufficient to heat treatments at 915oC temperatures and for SSR methods 945oC. The diamagnetic onset temperature of the superconducting transition for the TlBa2Ca2Cu3O8+δ samples prepared by precursors SG at 915oC and SSR at 945oC is about T = 120 K and full screening of applied ac magnetic fields observed at T ≈ 102 K and T ≈ 94 K, respectively. The value of Jc transport critical current densities for SSR obtained 128 A/cm2, whereas for the SG sample and exactly 174 A/cm2. We could conclude that the, using the wet chemistry offers some advantages in comparison with the classical solid-state ceramics processing, especially, better chemical homogeneity and higher reactivity of the precursor powder.

scholarly journals Superconducting properties of the powder-in-tube Cu–Mg–B and Ag–Mg–B wires

2002 ◽  
Vol 372-376 ◽  
pp. 1254-1257 ◽  
Author(s):  
B.A Glowacki ◽  
M Majoros ◽  
M.E Vickers ◽  
B Zeimetz
Keyword(s):  
Superconducting Properties ◽  
Powder In Tube

Low-temperature annealing effects upon the superconducting properties of V3Au

Physica ◽  
1971 ◽  
Vol 55 ◽  
pp. 523-533 ◽  
Author(s):  
R.A. Hein ◽  
J.E. Cox ◽  
R.D. Blaugher ◽  
R.M. Waterstrat ◽  
E.C. van Reuth
Keyword(s):  
Low Temperature ◽  
Superconducting Properties ◽  
Low Temperature Annealing ◽  
Annealing Effects
Sign in / Sign up

Export Citation Format

Share Document