Title :
Study of morphological and structural properties of multi-seeded NdBaCuO samples
Author :
Gombos, Marcello ; Vecchione, Antonio ; Tedesco, Patrizia ; Zola, Danilo ; Gambardella, Umberto ; Pace, Sandro
Author_Institution :
Dipartimento di Fisica, Salerno Univ., Italy
fDate :
3/1/2001 12:00:00 AM
Abstract :
In this work, we report on the morphological and structural properties of multi-seeded melt textured NdBaCuO bars, using MgO seeds. We have characterised the samples by x-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. In particular by these techniques we analysed the characteristics of boundaries joining adjacent domains. For 2 centimetres spacings between adjacent seeds, good texturing and absence of Nd422-rich quenched liquid deposits or other spurious phases near the boundaries have been observed. On the other side a serious mechanical fragility, sensibly enhanced along the boundary regions, is found. The superconducting properties, such as critical temperature and critical current density have been investigated by means of magnetic measurements
Keywords :
barium compounds; critical current density (superconductivity); crystal morphology; crystal structure; high-temperature superconductors; melt texturing; neodymium compounds; scanning electron microscopy; superconducting transition temperature; 2 cm; MgO seeds; Nd422-rich quenched liquid deposits; NdBa2Cu3O7; boundary regions; critical current density; critical temperature; energy dispersive spectroscopy; magnetic measurements; mechanical fragility; melt textured NdBaCuO bars; morphological properties; multi-seeded NdBaCuO samples; scanning electron microscopy; structural properties; texturing; x-ray diffraction; Bars; Critical current density; Dispersion; Fabrication; Magnetic analysis; Magnetic properties; Magnetic variables measurement; Scanning electron microscopy; Spectroscopy; X-ray diffraction;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
