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Crystallization features of YBa2Cu3O7-δ in the Y2BaCuO5-BaCuO2-CuO and Y2Cu2O5-BaCuO2 systems

✍ Scribed by N. A. Kalanda; L. I. Gurskii; A. M. Saad; V. M. Truhan; T. V. Haliakevich

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
832 KB
Volume
43
Category
Article
ISSN
0232-1300

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✦ Synopsis

Based on the data of X-ray phase and microstructure analysis, the sample composition was optimized in order to provide maximum size of the textured macrograins of YBa 2 Cu 3 O 7-δ and of the crystallites in the

BaCuO 2 systems. The growth rate has been studied and the YBa 2 Cu 3 O 7-δ growth activation energy has been calculated for the samples of Y 2 BaCuO 5 +3BaCuO 2 +2.3CuO, Y 2 BaCuO 5 +3BaCuO 2 +0.6CuO, and Y 2 Cu 2 O 5 +3.5BaCuO 2 compounds in the temperature range of 1240-1270K for the case of use of the Y 2 Cu 2 O 5 and Y 2 BaCuO 5 precursors with an average grain diameter of 10 µm and 1mm. A crystallization mechanism of YBa 2 Cu 3 O 7-δ in the Y 2 BaCuO 5 -BaCuO 2 -CuO and Y 2 Cu 2 O 5 -BaCuO 2 systems in the case of different sizes of Y 2 BaCuO 5 and Y 2 Cu 2 O 5 precursor grains was proposed and validated.

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