NDLI: Growth Speed and Substitution Effects on Alignment and Thermal Transport Properties of Bi-2212 Textured Superconductors

Content Provider	Springer Nature Link
Author	Ozabaci, M. Rasekh, Sh. Kizilaslan, O. Madre, M. A. Sotelo, A. Yakinci, M. E.
Copyright Year	2014
Abstract	Fe-substituted superconducting thin BiSrCaCuO rods with nominal compositions of Bi$_{2}$Sr$_{2}$Ca$_{1}$Cu$_{2−x }$Fe$_{ x }$O$_{8+δ }$ (x = 0, 0.01, 0.03, 0.05, and 0.1) were fabricated using the laser floating zone technique at two different growth speeds, 15 mm h$^{−1}$ and 30 mm h$^{−1}$. The influences of growth speed and Fe substitution on the grain alignment in the rods were evaluated by means of x-ray pole figure studies. The obtained results showed that both applied growth speed and Fe substitution play a crucial role on grain alignment, which is strongly connected with the current-carrying capacity of the rods. It was found that the rods grown at 15 mm h$^{−1}$ (G15) have stronger orientation than the rods grown at 30 mm h$^{−1}$ (G30). However, in contrast to the G15 rods, an increased substitution rate improved the orientation of the G30 rods. Another important observation is that the increase on the substitution caused a decrease on the grain size of all the rods. The decrease of critical temperature values of the rods upon substitution was ascribed to both grain size effect and formation of a nonsuperconducting Fe-rich phase detected in scanning electron microscope/energy-dispersive x-ray analyses. The thermal conductivity values of the G15 and G30 rods were found to be in the range of 0.9–1.9 and 1.1–1.18 W m$^{−1}$ K$^{−1}$ at 150 K, respectively. The higher values of figure of merit (ZT), at all temperature ranges, were obtained from the highest substituted rods (x = 0.1) for both of the applied growth speeds. In addition, it was observed that the ZT of G30 rods are up to three times higher than that of G15 ones.
Starting Page	222
Ending Page	232
Page Count	11
File Format	PDF
ISSN	10474838
Journal	JOM
Volume Number	67
Issue Number	1
e-ISSN	15431851
Language	English
Publisher	Springer US
Publisher Date	2014-12-02
Publisher Institution	The Minerals, Metals & Materials Society (TMS)
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Engineering Chemistry/Food Science Physics Environment Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Engineering Materials Science

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