A characteristic spherultic microstructure in partial melt processed YBa{sub 2}Cu{sub 3}O{sub x}/HfO{sub 2}.
The microstructure of partial-melt-processed YBa{sub 2}Cu{sub 3}O{sub x}/HfO{sub 2} has been studied by transmission electron microscopy. A characteristic spherulitic microstructure is formed in the system. A model for the growth mechanism has been proposed. The critical heterogeneous nucleation of the YBa{sub 2}Cu{sub 3}O{sub x} phase appears to occur from the melt in an epitaxially controlled manner on CuO particles. Subsequent growth of YBa{sub 2}Cu{sub 3}O{sub x} platelets from the nucleus region is repeatedly interrupted by the nucleation of hafnium-rich phases in the liquid at the solid/liquid interface in a manner that again appears to be epitaxially controlled and that promotes the splay of the c orientation of the YBaCuO grain.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); FOR
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 942677
- Report Number(s):
- ANL/MSD/JA-33680; JACTAW; TRN: US200920%%30
- Journal Information:
- J. Am. Ceram. Soc., Vol. 83, Issue 5 ; 2000; ISSN 0002-7820
- Country of Publication:
- United States
- Language:
- ENGLISH
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