Effect of nano-NiO doping on the magnetic susceptibility and flux pinning in MgB₂ superconductor
by Nasser S. Alzayed
International Journal of Nanoparticles (IJNP), Vol. 2, No. 1/2/3/4/5/6, 2009

Abstract: Improving transport properties of polycrystalline MgB₂ by nanoparticle doping has been widely studied by researchers. We have investigated the effect of nano-nickel (as nickel oxide) doping on the critical current density (J_c) of bulk MgB₂ by measuring the ac susceptibility using locally made susceptometer. Samples were doped with nickel at 1%, 2%, 4%, 8% and 10% to investigate for the different quantities on the compound. We have studied the susceptibility as function of the amplitude of ac magnetic field and temperature. The uniformly distributed nano-Ni dopant replaced Mg ions only up to 2% and the rest was distributed uniformly throughout the material and served as pinning centres. J_c for the nano-Ni doped samples has been calculated from susceptibility data and was found to increase as we increased the Ni but saturates after 2%. J_c was enhanced by more than three times with doping. The little change in the XRD peak positions for MgB₂ shown by XRD results indicated that Ni doping did not strongly affect the lattice parameters of MgB₂. Susceptibility measurements reveals that T_c decreased from 37.7 for the pure sample down to 35.6 K for doped samples.

Online publication date: Wed, 30-Sep-2009

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

 
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Nanoparticles (IJNP):
Login with your Inderscience username and password:

Username:        Password:          Forgotten your password?

Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email subs@inderscience.com