Nd系超電導体のプロセス研究の動向 [in Japanese] Trend of Processing Research of Nd-system Superconductive Oxides [in Japanese]
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Single crystal growth and solidification processing of Nd- 123 superconductive oxides are reviewed in comparison with Y-123 oxide. Since Nd-123 crystal forms a solid solution due to Nd/Ba substitution, this crystal is considered to be nonstoichiometric while Y-123 is a stoichiometric compound at least for its cation constituents. Crystal growth processing of nonstoichiometric compounds (Nd-123) with homogeneous composition distribution should be different from that of stoichiometric (Y-123) compounds, because the former case is one degree of freedom in the Gibbs phase rule higher than the latter case. In this paper, difference in crystal growth mechanisms between Nd-123 and Y-123 is discussed, taking into consideration of equilibrium phase diagrams, kinetics of the 123 phase crystal growth.
- J. Jpn. Soc. Powder Powder Metallurgy
J. Jpn. Soc. Powder Powder Metallurgy 45(2), 109-113, 1998-02-15
Japan Society of Powder and Powder Metallurgy