Enhanced critical current properties of in situ processed MgB2 wires using milled boron powder and low temperature solid-state reaction

2010 ◽  
Vol 492 (1-2) ◽  
pp. 446-451 ◽  
Author(s):  
Byung-Hyuk Jun ◽  
Nam-Kyu Kim ◽  
Kai Sin Tan ◽  
Chan-Joong Kim
Keyword(s):  
Solid State ◽  
Low Temperature ◽  
Critical Current ◽  
Solid State Reaction ◽  
Boron Powder ◽  
Mgb2 Wires

Improved critical current properties observed in MgB2 bulks synthesized by low-temperature solid-state reaction

2004 ◽  
Vol 18 (1) ◽  
pp. 116-121 ◽  
Author(s):  
Akiyasu Yamamoto ◽  
Jun-ichi Shimoyama ◽  
Shinya Ueda ◽  
Yukari Katsura ◽  
Shigeru Horii ◽  
...  
Keyword(s):  
Solid State ◽  
Low Temperature ◽  
Critical Current ◽  
Solid State Reaction ◽  
Mgb2 Bulks

scholarly journals Effect of Heat Treatments under High Isostatic Pressure on the Transport Critical Current Density at 4.2 K and 20 K in Doped and Undoped MgB2 Wires

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5152
Author(s):  
Daniel Gajda ◽  
Andrzej J. Zaleski ◽  
Andrzej J. Morawski ◽  
Malgorzata Małecka ◽  
Konstantin Nenkov ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Solid State ◽  
Thermal Treatment ◽  
Magnetic Fields ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Solid State Reaction ◽  
Transport Critical Current Density ◽  
Mgb2 Wires

Annealing undoped MgB2 wires under high isostatic pressure (HIP) increases transport critical current density (Jtc) by 10% at 4.2 K in range magnetic fields from 4 T to 12 T and significantly increases Jtc by 25% in range magnetic fields from 2 T to 4 T and does not increase Jtc above 4 T at 20 K. Further research shows that a large amount of 10% SiC admixture and thermal treatment under a high isostatic pressure of 1 GPa significantly increases the Jtc by 40% at 4.2 K in magnetic fields above 6 T and reduces Jtc by one order at 20 K in MgB2 wires. Additionally, our research showed that heat treatment under high isostatic pressure is more evident in wires with smaller diameters, as it greatly increases the density of MgB2 material and the number of connections between grains compared to MgB2 wires with larger diameters, but only during the Mg solid-state reaction. In addition, our study indicates that smaller wire diameters and high isostatic pressure do not lead to a higher density of MgB2 material and more connections between grains during the liquid-state Mg reaction.

Ni/GeSn solid-state reaction monitored by combined X-ray diffraction analyses: focus on the Ni-rich phase

2018 ◽  
Vol 51 (4) ◽  
pp. 1133-1140 ◽  
Author(s):  
Andrea Quintero ◽  
Patrice Gergaud ◽  
Joris Aubin ◽  
Jean-Michel Hartmann ◽  
Vincent Reboud ◽  
...  
Keyword(s):  
Solid State ◽  
Low Temperature ◽  
Solid State Reaction ◽  
Metastable Phase ◽  
Hexagonal Structure ◽  
X Ray Diffraction ◽  
Rich Phase ◽  
X Ray ◽  
Pole Figures

The Ni/Ge0.9Sn0.1 solid-state reaction was monitored by combining in situ X-ray diffraction, in-plane reciprocal space map measurements and in-plane pole figures. A sequential growth was shown, in which the first phase formed was an Ni-rich phase. Then, at 518 K, the mono-stanogermanide phase Ni(Ge0.9Sn0.1) was observed. This phase was stable up to 873 K. Special attention has been given to the nature and the crystallographic orientation of the Ni-rich phase obtained at low temperature. It is demonstrated, with in-plane pole figure measurements and simulation, that it was the ∊-Ni5(Ge0.9Sn0.1)3 metastable phase with a hexagonal structure.

Low-temperature solid state synthesis and in situ phase transformation to prepare nearly pure cBN

2011 ◽  
Vol 40 (26) ◽  
pp. 6961 ◽  
Author(s):  
Gang Lian ◽  
Xiao Zhang ◽  
Miao Tan ◽  
Shunjie Zhang ◽  
Deliang Cui ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Solid State ◽  
Low Temperature ◽  
Solid State Synthesis
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