Hot isostatic pressing of powder in tube MgB[sub 2] wires

Serquis, A.; Civale, L.; Hammon, D. L.; Liao, X. Z.; Coulter, J. Y.; Zhu, Y. T.; Jaime, M.; Peterson, D. E.; Mueller, F. M.; Nesterenko, V. F.; Gu, Y.
April 2003
Applied Physics Letters;4/28/2003, Vol. 82 Issue 17, p2847
Academic Journal
The critical current density (J[SUBc]) of hot isostatic pressed (HIPed) MgB[SUB2] wires, measured by dc transport and magnetization, is compared with that of similar wires annealed at ambient pressure. The HIPed wires have a higher J[SUBc] than the annealed wires, especially at high temperatures and magnetic fields, and higher irreversibility field (H[SUBirr]). The HIPed wires are promising for applications, with J[SUBc] > 10[SUP6] A/cm[SUP2] at 5 K and zero field and >10[SUP4] A/cm[SUP2] at 1.5 T and 26.5 K, and H[SUBirr] ∼ 17 T at 4 K. The improvement is attributed to a high density of structural defects, which are the likely source of vortex pinning. These defects, observed by transmission electron microscopy, include small angle twisting, tilting, and bending boundaries, resulting in the formation of subgrains within MgB[SUB2] crystallites.


Related Articles

  • Magnetic tunnel junctions thermally stable to above 300 degrees C. Parkin, S.S.P.; Moon, K.-S. // Applied Physics Letters;7/26/1999, Vol. 75 Issue 4, p543 

    Examines the magnetic tunnel junctions formed from sandwiches of ferromagnetic layers separated by thin alumina tunnel barriers. Comparison of cross-section transmission electron micrographs; Interaction of the alumina layer with the ferromagnetic layers.

  • Tuning the crystal structure and magnetic properties of Fe doped In2O3 nanocrystals. Dewei Chu; Yu-Ping Zeng; Dongliang Jiang; Zhongming Ren // Applied Physics Letters;12/24/2007, Vol. 91 Issue 26, p262503 

    Fe doped In2O3 nanocrystals were synthesized by a coprecipitation method under external magnetic fields. X-ray diffraction data and high-resolution transmission electron microscopy analyses indicated the formation of single phase without any parasitic phases. The crystal structure of the...

  • Synthesis and Characterisation of Pure Cobalt Magnetic Nanoparticle by Metal Reduction. Nordin, N. H.; Neo, Y. S.; Ong, B. H. // AIP Conference Proceedings;6/1/2009, Vol. 1136 Issue 1, p123 

    The study of nanoparticles magnet domains is of both fundamental and pressing technical interest as the magnetic properties depend strongly on grain size. Comparing magnetic properties of pure metal nanoparticles with different grain sizes will visualise the steps needed to form monodispersed...

  • On the roles of Bi2Sr2CuOx intergrowths in Bi2Sr2CaCu2Ox/Ag round wires: c-axis transport and magnetic flux pinning. Naderi, G.; Schwartz, J. // Applied Physics Letters;4/14/2014, Vol. 104 Issue 15, p152602-1 

    Despite progress in the performance of Bi2Sr2CaCu2Ox (Bi2212)/Ag multifilamentary round wires, understanding the impact of microstructural defects on multiple length scales on electrical transport remains a significant challenge. Many recent studies have focused on porosity, but porosity is not...

  • Origin of ferromagnetism and oxygen-vacancy ordering induced cross-controlled magnetoelectric effects at room temperature. Wei, X. K.; Zou, T.; Wang, F.; Zhang, Q. H.; Sun, Y.; Gu, L.; Hirata, A.; Chen, M. W.; Yao, Y.; Jin, C. Q.; Yu, R. C. // Journal of Applied Physics;Apr2012, Vol. 111 Issue 7, p073904 

    In dilute magnetic oxide hexagonal Ba(Ti0.9Fe0.1)O2.81 bulk ceramic, we report on combined ferromagnetism and improper ferroelectricity as well as cross-controlled magnetoelectric effects at room temperature. The annular-bright-field (ABF) imaging technique in scanning transmission electron...

  • Structural study of Fe3O4(111) thin films with bulk like magnetic and magnetotransport behaviour. Gilks, D.; Lari, L.; Matsuzaki, K.; Hosono, H.; Susaki, T.; Lazarov, V. K. // Journal of Applied Physics;2014, Vol. 115 Issue 17, p17C107-1 

    Post-annealing of Fe3O4 films in a CO/CO2 atmosphere results in a significant improvement in magnetic and magnetotransport properties with values close to the single crystal bulk of Ms~480 emu/cm3 and negative magnetoresistance of 0.05% in a field of 1 T. By using atomic resolution Z-contrast...

  • A study of exchange bias in BiFeO3 core/NiFe2O4 shell nanoparticles. Yusuf, S. M.; Manna, P. K.; Shirolkar, Mandar M.; Kulkarni, S. K.; Tewari, R.; Dey, G. K. // Journal of Applied Physics;May2013, Vol. 113 Issue 17, p173906 

    We have carried out magnetization measurements on BiFeO3 core/NiFe2O4 shell nanoparticles, and searched for the exchange bias phenomenon in this system. The core-shell nature of these nanoparticles has been established from the transmission electron microscopy images. The neutron diffraction...

  • Large Gradient High Magnetic Fields Affect Osteoblast Ultrastructure and Function by Disrupting Collagen I or Fibronectin/αß1 Integrin. Ai-Ron Qian; Xiang Gao; Wei Zhang; Jing-Bao Li; Yang Wang; Sheng-Meng Di; Li-Fang Hu; Peng Shang // PLoS ONE;Jan2013, Vol. 8 Issue 1, Special section p1 

    The superconducting magnet generates a field and field gradient product that can levitate diamagnetic materials. In this study a specially designed superconducting magnet with a large gradient high magnetic field (LG-HMF), which can provide three apparent gravity levels (ц-g, 1-g, and 2-g),...

  • Room-temperature ferromagnetism in La2/3Sr1/3MnO3 nanoparticle assembled nanotubes. Curiale, J.; Sánchez, R. D.; Troiani, H. E.; Leyva, A. G.; Levy, P. // Applied Physics Letters;7/25/2005, Vol. 87 Issue 4, p043113 

    We present magnetic and transmission electron microscopy experiments on the double-exchange compound La2/3Sr1/3MnO3, nanostructured to form tubes with 700 nm of external diameter. Microscopy reveals that their walls are formed by a compact agglomerate of grains, whose sizes are around 20 nm. The...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics