Comparison of Levitation Forces of Bulk MgB2 Superconductors Produced by Nano Boron and Carbon-Doped Nano Boron

• DOI: 10.1007/s10948-014-2602-4
• Publication Date: 2014-06-19T14:00:48Z
• Authors: I. Duz; S. B. Guner; O. Erdem; I. Demir; V. Kapucu; Ş. Çelik; K. Ozturk; S. Hossain; A. Gencer; E. Yanmaz
• Keywords: 3104 Condensed Matter Physics; 2504 Electronic; Hot press; forces; Levitation force; Superconducting materials; 02 engineering and technology; superconductors; produced; Engineering; Presses (machine tools); Physical Sciences and Mathematics; doped; Low temperatures; levitation; Optical and Magnetic Materials; bulk; Increasing temperatures; Attractive force; MgB2 superconductors; carbon; 621; Boron and carbons; Hot pressing; 620; comparison; mgb2; nano; Repulsive forces; Resistance measurement; MgB superconductors; boron; 0210 nano-technology; Bulk superconductors

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).