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Microstructure of melt-textured YBa2Cu3O7-δ

✍ Scribed by D. Müller; M. Ullrich; K. Heinemann; H.C. Freyhardt

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
761 KB
Volume
220
Category
Article
ISSN
0921-4534

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✦ Synopsis

The microstructure of stoichiometric Bridgman melt-textured YBa2Cu307_6 was investigated by transmission electron microscopy and electron diffraction. Crystal defects like twins, dislocations, small second-phase inclusions and lattice distortions are observed. The density of the dislocations is extremely high ( 1.7 X 10t°/cm 2 ) and the average diameter of the second-phase inclusions (BaCuO2) of 35 nm is rather small. The density of the inclusions amounts to 6 × 10~9/m 3. The formation of the microstructural defects and their influence on flux pinning is discussed. It is supposed that the observed lattice distortions are possible defects which cause the fish-tail effect.

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✍ D. Müller; M. Ullrich; K. Heinemann; H.C. Freyhardt 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 184 KB

Melt-textured YIBa2Cu3OT-6 was processed by the VGF(vertical gradient freeze)-method. The precursor had an excess of 25mo1% Y2BaCuO5 (211) and 1.8mo1% PtO2. jc of these samples is enhanced compared to melt-textured YIBa2Cu3OT-~ with excess 211 but without PtO2 doping. In order to understand this enh