Effects of high-pressure annealing on critical current density in 1 2 2 type iron pnictide wires

2014 ◽  
Vol 504 ◽  
pp. 69-72 ◽  
Author(s):  
Sunseng Pyon ◽  
Yuji Tsuchiya ◽  
Hiroshi Inoue ◽  
Norikiyo Koizumi ◽  
Hideki Kajitani ◽  
...  
Keyword(s):  
High Pressure ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Iron Pnictide

scholarly journals Enhancement of critical current density in (Ba,Na)Fe2As2 round wires using high-pressure sintering

2020 ◽  
Vol 33 (6) ◽  
pp. 065001 ◽  
Author(s):  
Sunseng Pyon ◽  
Daisuke Miyawaki ◽  
Tsuyoshi Tamegai ◽  
Satoshi Awaji ◽  
Hijiri Kito ◽  
...  
Keyword(s):  
High Pressure ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
High Pressure Sintering

Effects of high-pressure sintering on critical current density in Co-doped BaFe2As2 wires

2014 ◽  
Vol 504 ◽  
pp. 73-76 ◽  
Author(s):  
Hiroshi Inoue ◽  
Yuji Tsuchiya ◽  
Shinya Tada ◽  
Sunseng Pyon ◽  
Hideki Kajitani ◽  
...  
Keyword(s):  
High Pressure ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
High Pressure Sintering ◽  
Co Doped

scholarly journals Self-Propagating High Temperature Synthesis of MgB2 Superconductor in High-Pressure of Argon Condition

2017 ◽  
Vol 19 (2) ◽  
pp. 177 ◽  
Author(s):  
S. Tolendiuly ◽  
S. M. Fomenko ◽  
G. C. Dannangoda ◽  
K. S. Martirosyan
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
High Pressures ◽  
Volume Fraction ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Ar Gas

<p>Magnesium diboride can be synthesized under argon ambient, elevated or high pressures. High-pressure syntheses are promising methods for manufacturing of the bulk MgB<sub>2</sub> superconductor material. We have been used high pressure of Ar gas in order to investigate its effect on properties of MgB<sub>2</sub> superconductor such as critical temperature and current density. Bulk MgB<sub>2</sub> superconductor was synthesized from elemental Mg–B powders in thermal explosion mode of self-propagating high-temperature synthesis (SHS) under argon pressure of 25 atm. XRD pattern of the as-synthesized product indicates an almost complete conversion of the reactants to the MgB<sub>2</sub> single phase. Most of the diffractions peaks are related to the MgB<sub>2</sub> polycrystalline bulk material. The impurity fraction is less than 24.3% in total sample and identified as MgO and MgB<sub>4</sub> secondary phases. The positive effect of pressure of Ar gas during synthesis of MgB2 on critical current density JC has been confirmed. The critical current density of the sample was achieved in high pressure reactor was 3.8×10<sup>6</sup> A/cm<sup>2</sup>. A superconducting volume fraction of 16% under a magnetic field of 10 Oe was obtained at 5 K, indicating that the superconductivity was bulk in nature. The succeeded level of superconductor parameters of the high-pressure synthesized MgB<sub>2</sub> and the possibility to produce a large bulk products make this technology very promising for practical applications.</p>

High Critical Current Density of a MgB2 Bulk Superconductor High-pressure Synthesized Directly from the Elements

2002 ◽  
Vol 17 (3) ◽  
pp. 525-527 ◽  
Author(s):  
C-Q. Jin ◽  
S-C. Li ◽  
J-L. Zhu ◽  
F-Y. Li ◽  
Z-X. Liu ◽  
...  
Keyword(s):  
High Pressure ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Superconducting Transition ◽  
High Critical Current Density ◽  
Bulk Superconductor ◽  
High Pressure Sintering ◽  
Current Densities ◽  
Pressure Synthesis

We report the property studies of a MgB2 superconductor with high critical current density. The MgB2 superconductor was readily fabricated through a direct high-pressure synthesis of the respective elements. The obtained high-density MgB2 undergoes a sharp superconducting transition at 39 K. The bulk critical current density (Jc) of the sample was calculated on the basis of Bean's critical state model, and rather high critical current densities over a wide temperature range were obtained in comparison with the ambient prepared samples. The results highlight that high-pressure sintering would be a promising way to produce and search for this kind of intermetallic boride and the related superconductors.

scholarly journals Disorder induced effects on the critical current density of iron pnictide BaFe1.8Co0.2As2 single crystals

2010 ◽  
Vol 470 ◽  
pp. S452-S453 ◽  
Author(s):  
M. Zehetmayer ◽  
M. Eisterer ◽  
H.W. Weber ◽  
J. Jiang ◽  
J.D. Weiss ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Single Crystals ◽  
Critical Current ◽  
Current Density ◽  
Iron Pnictide

High-Pressure High-Temperature Synthesis of Nanostructural Magnesium Diboride for Electromotors and Devices Working at Liquid Hydrogen Temperatures

2006 ◽  
Vol 47 ◽  
pp. 25-30 ◽  
Author(s):  
Tatiana Prikhna ◽  
Wolfgang Gawalek ◽  
Yaroslav Savchuk ◽  
Nina Sergienko ◽  
Viktor Moshchil ◽  
...  
Keyword(s):  
High Pressure ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
High Pressure Cell ◽  
Ybco Bulk ◽  
High Temperature Synthesis ◽  
High Pressure High Temperature ◽  
Impurity Hydrogen ◽  
First Time

Addition of Ti and Zr to high-pressure (HP) synthesized MgB2 results in an increase of critical current density of the material due to the absorption of impurity hydrogen coming most likely from the materials of a high-pressure cell. The results of the studies of structure, critical current density, trapped field and mechanical characteristics are discussed. High-pressure synthesized MgB2 (with Ti additions) blocks were for the first time used in a SC electromotor at 20 K and demonstrated the efficiency similar to that of MT-YBCO bulk (at the same working temperature).

The Effect of Oxygen Distribution Inhomogeneity and Presence of Higher Borides on the Critical Current Density Improvement of Nanostructural MgB2

2010 ◽  
Vol 75 ◽  
pp. 161-166 ◽  
Author(s):  
Tetiana Prikhna ◽  
Wolfgang Gawalek ◽  
Yaroslav Savchuk ◽  
Maxim Serga ◽  
Tobias Habisreuther ◽  
...  
Keyword(s):  
High Pressure ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Upper Critical Field ◽  
The Self ◽  
Ex Situ ◽  
Ac Losses ◽  
Material Structure ◽  
Effect Of Oxygen

MgB2-based nanostructural materials with rather high oxygen concentration (5-14 wt.%) and dispersed grains of higher borides (MgB12, MgB7) high-pressure (2 GPa or 30 MPa) synthesized (in-situ) or sintered (ex-situ) demonstrated high superconducting characteristics (critical current density, jc, up to 1.8-1.0106 A/cm2 in the self magnetic field and 103 in 8 T field at 20 K, 3-1.5105 A/cm2 in the self field at 35 K, upper critical field up to HC2 = 15 T at 22 K, field of irreversibility Hirr =13 T at 20 K). The additives (Ti, SiC) and synthesis or sintering temperature can affect the segregation of oxygen and formation of oxygen-enriched Mg-B-O inclusions in the material structure, thus reducing the amount of oxygen in the material matrix as well as the formation of higher borides grains, which affects an increase of the critical current density. The record high HC2 and Hirr have been registered for the material high-pressure (2 GPa) synthesized from Mg and B at 600 oC having 17% porosity and more than 7 wt.% of oxygen. The attained values of the critical current, AC losses and thermal conductivity make the materials promising for application for fault current limiters and electromotors. The structural and superconducting (SC) characteristics of the material with matrix close to MgB12 in stoichiometry has been studied and the SC transition Tc=37 K as well as jc= 5×104 A/cm2 at 20 K in the self field were registered, its Raman spectrum demonstrated metal-like behavior.

Effects of High-Pressure Sintering on Critical Current Density in (Ba,K)Fe2As2 PIT Wires

2015 ◽  
Vol 25 (3) ◽  
pp. 1-4 ◽  
Author(s):  
T. Tamegai ◽  
S. Pyon ◽  
Y. Tsuchiya ◽  
H. Inoue ◽  
N. Koizumi ◽  
...  
Keyword(s):  
High Pressure ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
High Pressure Sintering
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