World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Journal of Applied Physics : Effect of grain refinement on enhancing critical current density and upper critical field in undoped MgB2 ex situ tapes

By A. Malagoli, V. Braccini, M. Tropeano, M. Vignolo, C. Bernini et al

Click here to view

Book Id: WPLBN0002169409
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 18 November 2008

Title: Journal of Applied Physics : Effect of grain refinement on enhancing critical current density and upper critical field in undoped MgB2 ex situ tapes  
Author: A. Malagoli, V. Braccini, M. Tropeano, M. Vignolo, C. Bernini et al
Volume: Issue : November 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection, Journal of Applied Physics Collection
Historic
Publication Date:
Publisher: American Institute of Physics

Citation

APA MLA Chicago

V. Braccini, M. Tropeano, M. Vignolo, C. Bernini Et A, A. M. (n.d.). Journal of Applied Physics : Effect of grain refinement on enhancing critical current density and upper critical field in undoped MgB2 ex situ tapes. Retrieved from http://worldebookfair.com/


Description
Description: Ex situ powder-in-tube MgB2 tapes prepared with ball-milled, undoped powders showed a strong enhancement of the irreversibility field H∗, the upper critical field Hc2, and the critical current density Jc(H) together with the suppression of the anisotropy of all of these quantities. Jc reached 104 A/cm2 at 4.2 K and 10 T, with an irreversibility field of about 14 T at 4.2 K, and Hc2 of 9 T at 25 K, high values for not-doped MgB2. The enhanced Jc and H∗ values are associated with significant grain refinement produced by milling of the MgB2 powder, which enhances grain boundary pinning, even if at the same time also reducing the connectivity from about 12% to 8%. Although enhanced pinning and diminished connectivity are in opposition, the overall influence of ball milling on Jc is positive because the increased density of grains with a size comparable with the mean free path produces strong electron scattering that substantially increases Hc2, especially Hc2 perpendicular to the Mg and B planes.

 

Click To View

Additional Books


  • Journal of Applied Physics : Reflection ... Volume Issue : November 2008 (by )
  • Journal of Applied Physics : Charge dyna... Volume Issue : November 2008 (by )
  • Applied Physics Letters : Ferromagnetic ... Volume Issue : December 2008 (by )
  • The Journal of Chemical Physics : Interm... Volume Issue : November 2008 (by )
  • Journal of Applied Physics : Simultaneou... Volume Issue : November 2008 (by )
  • Journal of Applied Physics : Magnetoelec... Volume Issue : November 2008 (by )
  • Chaos : Stability and multiple bifurcati... Volume Issue : November 2008 (by )
  • Journal of Applied Physics : Comparison ... Volume Issue : November 2008 (by )
  • Biblioteca Hispanica : Course Methodical... (by )
  • Review of Scientific Instruments : Veloc... Volume Issue : December 2008 (by )
  • Review of Scientific Instruments : Measu... Volume Issue : December 2008 (by )
  • Review of Scientific Instruments : High-... Volume Issue : December 2008 (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Fair are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.