Fabrication of binary FeSe superconducting wires by diffusion process

Ozaki, Toshinori; Deguchi, K.; Mizuguchi, Yoshikazu; Kawasaki, Yuki; Tanaka, Takayoshi; Yamaguchi, Takahide; Kumakura, Hiroaki; Takano, Yoshihiko

doi:10.1063/1.4726243

Cited by 51 publications

(54 citation statements)

References 21 publications

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“…Further, the low field J c values were also good as compared to the recently reported FeSe wire prepared by diffusion process [16]. The critical current densities of 350 A/cm 2 and 1,027 A/cm 2 were reported for FeSe tapes and several-core FeSe wires with Fe tapes, respectively [17]. The improved J c results can originate from a better grain connectivity due to the higher sintering temperature used in the present synthesis process.…”

supporting

confidence: 64%

Processing and Characterization of Bulk FeSe

Muralidhar¹,

Hanai²,

Furutani³

et al. 2016

JEE

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Abstract:We investigated the effect of processing conditions on the structure and physical properties of the polycrystalline samples of Ca 0.8 Fe 2 Se 2 prepared via solid state reaction. X-ray diffraction showed that the main phase became FeSe when the sintering temperature increased above 350 °C. The temperature dependence of magnetization (M-T curves) recorded in zero-field-cooled mode by SQUID magnetometer showed some bumps at around 120 K to 140 K. These bumps moved to lower temperatures when the processing temperature increased above 550 °C. On the other hand, pure FeSe materials produced at 900 °C for 24 h showed a sharp superconducting transition T c,onset = 8.16 K and the critical current density of 6,252 A/cm 2 at 5 K, self-field. SEM results indicated an enhanced grain connectivity.

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confidence: 64%

Processing and Characterization of Bulk FeSe

Muralidhar¹,

Hanai²,

Furutani³

et al. 2016

JEE

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“…Indeed, there are many reports about pressure-induced enhancement of T c in FeTe 0.5 Se 0.5 thin film [20][21][22] . Recently, we reported that the FeSe wires fabricated by the Fe-diffusion Power-in-tube PIT method showed T c zero ~10.5 K, about ~2 K above that of bulk sample 23 . This may come from a unique synthetic condition: FeSe wires were heat-treated at 800°C for 2 hours and taken out from a furnace to quench them.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of superconducting properties in FeSe wires using a quenching technique

Ozaki

Mizuguchi

Demura

et al. 2012

Journal of Applied Physics

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(Abstract)Enhancements of superconducting properties were observed in FeSe wires using a quenching technique. Zero resistivity was achieved at about 10 K in quenched wires, which is about 2 K higher than that of polycrystalline FeSe bulk. Furthermore, transport J c of quenched wires showed three times higher than that of furnace-cooled wires. In contrast, the quenched polycrystalline FeSe bulks did not show the enhancement of T c .The quenching technique is a greatly promising for fabricating FeSe wires with high T c and high J c , and quenched FeSe wires have high potential for superconducting wire applications.3

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“…However, such a high transport Jc has not been achieved in the Fe-chalcogenide PIT wires (or tapes) with polycrystalline cores. The highest recorded transport Jc among the Fe-chalcogenide wires is about 1 kA/cm 2 under the self-field at 4.2 K in the FeSe wire fabricated by the in situ PIT method [14].…”

Section: Introductionmentioning

confidence: 99%

“…Owing to their high superconductivity performance at high magnetic fields, one of the potential applications of Fe-based superconductors is a superconducting wire or tape for magnets. Thus far, several types of Fe-based superconducting wires have been fabricated using A1-xKxFe2As2 (A = Ba, and Sr) [5][6][7][8], SmFeAsO1-xFx [9][10][11], and Fe chalcogenides (FeSe-based [12][13][14][15][16][17][18][19] or FeTe-based [20][21][22][23][24] superconductors). The FeAs-based superconducting wires (particularly, Ba1-xKxFe2As2 and Sr1-xKxFe2As2 wires) fabricated by the powder-in-tube (PIT) method showed a high critical current density (Jc).…”

Section: Introductionmentioning

confidence: 99%

Crystal structure instability of FeSe grains: Formation of non-superconducting phase at the grain surface

Izawa¹,

Tanaka²,

Mizuguchi³

et al. 2016

Jpn. J. Appl. Phys.

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We investigated the magnetization and crystal structure of FeSe polycrystalline samples with various grain sizes. For the samples with large grains, a large magnetic critical current density Jc was observed. For the samples with small grains, superconductivity signals were not observed; instead, magnetization hysteresis, which is not a result of superconductivity, was observed. In the X-ray diffraction pattern for the samples with small grains, broad additional peaks were observed, corresponding to the formation of the non-superconducting (monoclinic) Fe-Se phase at the FeSe grain surface. The crystal structure instability at the grain surface would be the reason for the low superconducting properties of the Fe-chalcogenide polycrystalline wires investigated thus far.

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Fabrication of binary FeSe superconducting wires by diffusion process

Cited by 51 publications

References 21 publications

Processing and Characterization of Bulk FeSe

Processing and Characterization of Bulk FeSe

Enhancement of superconducting properties in FeSe wires using a quenching technique

Crystal structure instability of FeSe grains: Formation of non-superconducting phase at the grain surface

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