caa a22 4500 388022744 CHVBK 20180307124929.0 cr unu---uuuuu 161130e199805 xx s 000 0 eng 10.1557/JMR.1998.0162 doi S0884291400043995 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0162 Anisotropic growth morphology and platelet formation in large grain Y-Ba-Cu-O grown by seeded peritectic solidification [Elektronische Daten] The characteristic platelet-like structure of large grain superconducting Y-Ba-Cu-O fabricated using peritectic solidification techniques has been documented widely as a key microstructural feature of this material. The platelet formation mechanism is investigated via a detailed comparison of the difference in morphology of YBa2Cu3O7-δ (123) growth fronts propagating along different lattice directions. The development of YBa2Cu3O7-δ dendrites between the growth front and local Y2BaCuO5 (211) particles is observed to be a key feature of the growth mechanism along all directions. Dendrites broaden rapidly for growth fronts propagating along the c-axis due to the enhanced growth rate of Y-Ba-Cu-O in the a-b plane to yield a uniform, regular growth morphology. Dendrite broadening is inhibited for grain growth along the a-b directions, however, due to the slower growth rate along the c-axis, which yields an irregular extended growth front. Growth along the a/b direction commonly results in the formation of regions consisting of 123 dendrites which may connect 211 particles. Continued solidification of the 123 phase in such regions results in the development of platelet structures perpendicular to the crystallographic c-axis in the YBa2Cu3O7-δ phase matrix which may impede the flow of current through the grain in the superconducting state. Copyright © Materials Research Society 1998 Lo Wai IRC in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, United Kingdom Cardwell D. A. IRC in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, United Kingdom Chow J. C. L. IRC in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, United Kingdom Journal of Materials Research Cambridge University Press 13/5(1998-05), 1141-1146 0884-2914 13:5<1141 1998 13 JMR https://doi.org/10.1557/JMR.1998.0162 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0162 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lo Wai IRC in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, United Kingdom NATIONALLICENCE 700 1- Cardwell D. A. IRC in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, United Kingdom NATIONALLICENCE 700 1- Chow J. C. L. IRC in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, United Kingdom NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/5(1998-05), 1141-1146 0884-2914 13:5<1141 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge