Title

Comparison of levitation forces of bulk MgB2 superconductors produced by nano boron and carbon-doped nano boron

RIS ID

91219

Publication Details

Duz, I., Guner, S. B., Erdem, O., Demir, I., Kapucu, V., Celik, S., Ozturk, K., Hossain, S., Gencer, A. & Yanmaz, E. (2014). Comparison of levitation forces of bulk MgB2 superconductors produced by nano boron and carbon-doped nano boron. Journal of Superconductivity and Novel Magnetism, 27 (10), 2241-2247.

Abstract

MgB2 bulk superconductors were prepared by hot press plus furnace heating method. Two types of boron powders were used, one is amorphous nano boron and the other is C-doped boron. Characteristics of superconductors were determined by XRD and resistance measurements. Systematic levitation force measurements were performed by using a modular system at low temperatures. These bulk superconductors showed around 9 N repulsive and 4 N attractive forces in the z-axis at 20 K at closest point to the cryostat lid which contains the MgB2 superconductor. These values slightly decreased by increasing temperature to 24 and 28 K for both samples. Comparing two samples, nano boron MgB2 showed slightly higher levitation force than C-doped MgB2 although C-doped MgB2 has higher attractive force value at the closest point. This situation points out that C-doped MgB2 is much proper for attractive force applications (as guidance force) while the nanoboron MgB2 sample is much appropriate for repulsive force (as levitation).

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Link to publisher version (DOI)

http://dx.doi.org/10.1007/s10948-014-2602-4