Control of Y2BaCuO5 morphology in melt-textured YBaCuO oxides with PtO2·H2O addition

✍ Scribed by Chan-Joong Kim; Ki-Baik Kim; Hai-Woong Park; Gye-Won Hong

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 823 KB
• Volume: 250
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(95)00315-0

✦ Synopsis

The influence of precursor composition (YBa2Cu30 x and Y1.6Ba2.3Cu3.3Ox ) and a procedure of PtO 2 • H20 addition on Y2BaCuO5 morphology was investigated in melt-textured Y-Ba-Cu-O oxides. It is found that the 2-1-1 morphology sensitively depends not only on the composition of the starting material but also on the adding procedure of PtO 2 -H20 powder. In YBa2Cu3Ox, coarse/plate-like Y2BaCuO5 particles are produced, while fine/equiaxed 2-1-1 particles are produced in Y].6Ba2.3Cu3.3Ox . On the other hand, needle-like 2-1-1 particles are produced when 1 wt.% PtO 2 -H20 was added to Y203-BaCOa-CuO while granular 2-1-1 particles are produced when PtO 2 • H20 was added to YBa2Cu30 x-Y2BaCuO5 powder. Y2BaCuO5 morphologies developed from precursors with/without PtO 2 -H20 addition are discussed on the basis of the growth behavior of Y2BaCuO5 particles at the reaction stages (the solid-state, incongruent melting and peritectic reaction) of melt-texture processing.