CUED Publications database

Fabrication of large grain Nd-Ba-Cu-O by seeded melt growth

Cardwell, DA and Babu, NH and Kambara, M and Smith, PJ and Shi, Y (2000) Fabrication of large grain Nd-Ba-Cu-O by seeded melt growth. Physica C: Superconductivity and its Applications, 341-34. IV/-IV/. ISSN 0921-4534

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Abstract

Large, single grain Nd-Ba-Cu-O (NdBCO) composite samples of NdBa2Cu3O7-δ (Nd-123) containing 15 and 20 mol. % non-superconducting Nd4Ba2Cu2O10 (Nd-422) phase inclusions have been fabricated successfully by a variety of techniques based on top-seeded melt growth under reduced oxygen partial pressure. Specifically, individual grains up to 2cm in diameter have been grown using (100) oriented MgO seeding, self (NdBCO) seeding at elevated temperature and self-seeding of Ag and Au doped precursor pellets. The latter exhibit a reduced peritectic decomposition temperature compared with the undoped compound. These techniques, which vary in degree of difficulty and hence reliability, yield grains with a range of microstructural homogeneity. This paper describes the general aspects of large NdBCO grain fabrication and presents the results of the different fabrication techniques.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 13:04
Last Modified: 27 Nov 2014 19:22
DOI: 10.1016/S0921-4534(00)01010-8