Sintering and densification mechanisms of Y2BaCuO5 pellets

Alarco, J. A., Ilyushechkin, A., Yamashita, T., & Bhargava, A. (1999) Sintering and densification mechanisms of Y2BaCuO5 pellets. Materials Science and Engineering B, 64(2), pp. 130-136.

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The sintering and densification of Y2BaCuO5 (Y-211) pellets made from powders with different characteristics have been investigated in the temperature range 1000-1140°C. A pellet made from powder containing Ba-rich secondary phases shows very early liquid-assisted sintering and densification and clear evidence of exaggerated grain growth. The melting of BaCuO2 and YBa2Cu3O7-δ (Y-123) secondary phases increases the rate of densification of Y-211 pellets made from other powders at temperatures above 1025-1030°C. All the liquid produced by the melting of the latter phases recrystallizes as intergranular layers of Y-123. These intergranular layers account for the darker appearance and for measurable electrical conductivities at room temperature of the pellets sintered at the higher temperatures. The development of exaggerated grain growth within a uniform fine-grained matrix opens the possibility of using controlled secondary recrystallization to obtain large single domains of Y-211, provided that the trapping of porosity can be avoided or minimized. © 1999 Elsevier Science S.A.

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ID Code: 64002
Item Type: Journal Article
Refereed: Yes
Keywords: Densification, Microstructure, Sintering, Y2BaCuO5, Crystal microstructure, Crystallization, Electric conductivity measurement, Grain growth, Melting, Porosity, Powder metallurgy, Temperature, Thermodynamic stability, Controlled secondary recrystallization, Fine grained matrix, Intergranular layers, Liquid assisted sintering, Yttrium barium copper oxides
DOI: 10.1016/S0921-5107(99)00164-6
ISSN: 09215107
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 06 Nov 2013 23:44
Last Modified: 06 Nov 2013 23:44

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