Abstract
Studies of microstructural, mechanical and superconducting properties of Ag diffused MgB2 superconductors by way of scanning electron microscopy, X-ray diffraction and Vickers microhardness measurements. A systemic examination of the magnetoresistance measurements for our prepared samples is exerted under applied magnetic fields started from 0.0 up to 7 T, and their results are described according to thermally activated flux creep. Further, this study reveals explanations of the diffusion coefficient (diffusivity) and activation energy of Ag impurities in the MgB2 materials using the resistivity measurements for the first time. Additionally, all the samples display the indentation size effect nature under the applied indentation test load. Regarding the theoretical modeling of the microhardness evidences, the calculations performed by HK approach are quite closer to the values of the load dependent microhardness.
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