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The effect of excess neodymia on the grain growth of Nd1+xBa2−xCu3Oy solid solutions

Published online by Cambridge University Press:  31 January 2011

Russell B. Rogenski ,
Kenneth H. Sandhage ,
Alexander L. Vasiliev  and
Eric P. Kvam
Russell B. Rogenski
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210
Kenneth H. Sandhage
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210
Alexander L. Vasiliev
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907
Eric P. Kvam
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907
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Abstract

The grain growth of dense, fine-grained Nd1+xBa2−xCu3Oy (x = 0.1−0.4) specimens has been examined in pure O2(g) at 938 °C and 967 °C. No detectable change in average grain size was observed for Nd1.4Ba1.6Cu3Oy within 72 h at 967 °C; however, a significant increase in average grain size developed between 18 and 24 h at 967 °C for Nd1.3Ba1.7Cu3Oy, and within 8−12 h at ≤967 °C for Nd1.2Ba1.8Cu3Oy and Nd1.1Ba1.9Cu3Oy. Microstructural analyses revealed that sudden changes in average grain size coincided with the formation of relatively large (abnormal) grains. A broadening of the grain size distribution was also observed. TEM analyses revealed that grain boundaries were free of second phases. The possible role of anisotropy in grain boundary energy and/or mobility on grain growth is discussed.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 10 , October 1998 , pp. 2819 - 2832
Copyright
Copyright © Materials Research Society 1998

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