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Typical XRD patterns of heat-treated tapes prepared with different starting compositions. The XRD peaks of are indexed, and the peaks of MgO and Mg are marked by solid circles and squares, respectively.
Average values of tapes measured at 4.2 K and in a field of 10 T with respect to the starting Mg content. The line is only a guide for the eyes.
Magnetic field dependence of the critical current density for various samples measured at 4.2 K. The inset shows the normalization of by as a function of the magnetic field.
Typical SEM images of samples with and .
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