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Crystallization features 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
Author(s) -
Kalanda N. A.,
Gurskii L. I.,
Saad A. M.,
Truhan V. M.,
Haliakevich T. V.
Publication year - 2008
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200711127
Subject(s) - crystallite , crystallization , microstructure , materials science , crystallography , grain size , mineralogy , analytical chemistry (journal) , chemistry , metallurgy , chromatography , organic chemistry
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 Y 2 BaCuO 5 ‐BaCuO 2 ‐CuO, Y 2 Cu 2 O 5 ‐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. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)