MgB2 superconductor has been synthesized using a simple technique at ambient pressure. The synthesis was carried out in helium atmosphere over a wide range of temperatures. Magnesium was employed in excess to the stoichiometry to prevent the decomposition of MgB2. Samples of MgB2 thus prepared have been almost free from MgO as compared to other methods. Resistivities of the samples are quite low with residual resistivity ratio (RRR) of around 3. 𝑇c (𝑅 = 0) is 38.2–38.5 K with 𝛥𝑇c of 0.6–1.0 K. Comparative studies of various methods of low pressure synthesis have been presented.
Volume 43, 2020
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