Abstract
Changes in structure and magnetization of MgB2 by mechanical milling have been examined by means of X-ray diffraction and magnetization measurements. Powder sample we used is commercially available and contains a small amount of MgO. Mechanical milling was done between 0 and 384 h. The intensity of the Bragg peaks decreases and the width increases with milling time. This means that the crystallite size becomes smaller and the strain in the crystal structure increases. All samples show the superconducting transition at Tc=39 K and Tc does not change by milling. The diamagnetization caused by superconductivity decreases with milling time. This suggests that mechanical milling acts on only destroying a superconducting state in some part of MgB2 without changing superconducting properties in the remaining part.
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