Effect of sintering temperature under high pressure on the superconductivity of MgB[sub 2]

Jung, C. U.; Park, Min-Seok; Kang, W. N.; Kim, Mun-Seog; Kim, Kijoon H. P.; Lee, S. Y.; Lee, Sung-Ik
June 2001
Applied Physics Letters;6/25/2001, Vol. 78 Issue 26, p4157
Academic Journal
We report on the effect of sintering temperature on the superconductivity of MgB[sub 2] pellets prepared under a high pressure of 3 GPa. The superconducting properties of the nonheated MgB[sub 2] were poor. However, as the sintering temperature increased, the superconducting properties were vastly enhanced, which was demonstrated by the narrow transition width for the resistivity and the low-field magnetization. The observed surface morphology using scanning electron microscopy showed that these changes were closely related to changes in the microscopic level such as the connectivity of the grains. © 2001 American Institute of Physics.


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