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The influence of support temperature on Bi-2212 monoliths textured by diode laser zone melting

A laser assisted zone melting process has been used to texture large Bi-2212 planar polycrystalline samples with approximate dimensions 100 mm × 10 mm × 1 mm using a high power diode laser. In this technique, the temperature of the support strongly affects the microstructure and the superconducting properties of the textured material. Both the surface solidification interfaces and the thickness solidification profile are shown to depend on the support temperature. This dependence has been correlated with the changes in the microstructure; in particular, with the development of a highly textured region. The thickness of this region changes from 200 up to 850 µm when the support temperature is increased up to 600 °C and it has been found to strongly influence the superconducting properties of the material.