Enhancement of critical current density and irreversibility field by Te or TeO2 addition to MgB2 bulk processed by spark plasma sintering

2012 ◽  
Vol 66 (8) ◽  
pp. 570-573 ◽  
Author(s):  
G. Aldica ◽  
S. Popa ◽  
M. Enculescu ◽  
P. Badica
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Spark Plasma Sintering ◽  
Current Density ◽  
Irreversibility Field ◽  
Mgb2 Bulk ◽  
Plasma Sintering ◽  
Spark Plasma

scholarly journals Improvement of critical current density of MgB 2 bulk superconductor processed by Spark Plasma Sintering

2020 ◽  
Vol 103 (11) ◽  
pp. 6169-6175
Author(s):  
Jacques G. Noudem ◽  
Yiteng Xing ◽  
Pierre Bernstein ◽  
Richard Retoux ◽  
Masaki Higuchi ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Spark Plasma Sintering ◽  
Current Density ◽  
Bulk Superconductor ◽  
Plasma Sintering ◽  
Spark Plasma

Synthesis of CaKFe4As4 bulk samples with high critical current density using a spark plasma sintering technique

2020 ◽  
Vol 33 (9) ◽  
pp. 094005
Author(s):  
Shigeyuki Ishida ◽  
S Pavan Kumar Naik ◽  
Yoshinori Tsuchiya ◽  
Yasunori Mawatari ◽  
Yoshiyuki Yoshida ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Spark Plasma Sintering ◽  
Current Density ◽  
High Critical Current Density ◽  
Plasma Sintering ◽  
Spark Plasma

Superconducting composites of MgB2 with Additions obtained by Spark Plasma Sintering

2012 ◽  
Vol 1454 ◽  
pp. 115-121
Author(s):  
P. Badica ◽  
G. Aldica ◽  
M. Burdusel
Keyword(s):  
Critical Current Density ◽  
Spark Plasma Sintering ◽  
Current Density ◽  
Irreversibility Field ◽  
Metal Powders ◽  
Secondary Phases ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
High Fields ◽  
Composite Samples

ABSTRACTSb2O3, Sb-metal, Bi2O3 or Bi-metal, powders were mixed with MgB2 powder. Starting compositions were ((MgB2)(M2O3)x, x = 0.0025, 0.005, 0.015, and (MgB2)(M)y, y = 0.01, M = Sb, Bi. Mixtures were processed by Spark Plasma Sintering (SPS) technique. As obtained composite samples show high density, above 94% of the theoretical density. While the secondary phases indicate on similar reactions, samples show different behavior vs. addition type and amount. This does not directly correlate with the melting temperature of the addition. From the critical current density (Jc) and irreversibility field (Hirr) enhancement viewpoints, optimum additions are oxides for x=0.025, 0.005. Both oxides are improving Jc at high fields, but Sb2O3 is effective up to 10 K, while Bi2O3 is up to 30 K. Metal additions are decreasing Jc and Hirr when compared to pristine MgB2sample.

Insertion versus Growth of Magnetic Nanoparticles in MgB2 Superconducting Composites

2014 ◽  
Vol 941-944 ◽  
pp. 458-461
Author(s):  
Viorel Sandu ◽  
Gheorghe Aldica ◽  
Petre Badica ◽  
Andrei Kuncser ◽  
Yuichiro Hayasaka
Keyword(s):  
Magnetic Nanoparticles ◽  
Critical Current Density ◽  
Critical Current ◽  
Spark Plasma Sintering ◽  
Current Density ◽  
Magnetic Interaction ◽  
Flux Lines ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Organic Precursors

MgB2-based superconducting composites with magnetic nanoparticles were fabricated by spark plasma sintering technique. Two methods have been used to create nanoparticles within MgB2 matrix: i) direct insertion of passivated magnetic nanoparticles; ii) growth of magnetic nanoparticles by thermolysis of polymers or metallo-organic precursors. These composites display an enhanced critical current density due to the additional magnetic pinning generated by the magnetic interaction with the flux lines.

Effect of a hot-press method on the critical current density of MgB2 bulk samples

2008 ◽  
Vol 468 (15-20) ◽  
pp. 1369-1371 ◽  
Author(s):  
K. Shinohara ◽  
T. Futatsumori ◽  
H. Ikeda
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Hot Press ◽  
Mgb2 Bulk ◽  
Press Method
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