Phase formation and melt processing of Yb- 123.
The formation of Yb-123 has been studied at different temperatures in air and in reduced oxygen partial pressure. It is found that the stability and/or the formation kinetics of Yb-123 phase is a major hurdle in manufacturing phase-pure Yb-123 in air. However, under reduced oxygen partial pressure, Yb-123 forms rapidly and more than 90% phase-pure Yb-123 is achieved within three sintering steps. Rods made from this powder were melt-processed in air and showed a T{sub c} of 90 K. Kinetic studies performed by interrupting the growth during the directional solidification of these rods revealed a growth mechanism similar to that of Y-123 and a maximum growth rate of 7.2 mm/h for a stable planar interface. EPMA of the interface showed the liquid to be rich in barium cuprates with a Ba:Cu ratio of 1:3.
- Research Organization:
- Argonne National Laboratory (ANL)
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 942408
- Report Number(s):
- ANL/ET/JA-31115
- Journal Information:
- Appl. Supercond., Journal Name: Appl. Supercond. Journal Issue: 5 ; 1998 Vol. 11; ISSN JOUSEH; ISSN 0896-1107
- Country of Publication:
- United States
- Language:
- ENGLISH
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