Abstract
We have studied the microstructure of melt-growth GdBa2Cu 3O7-δ (Gd123) bulk superconductors with the addition of Gd2Ba4CuMOx (abbreviated as M2411 with M ≤ Mo or Zr) particles by transmission electron microscopy. Gd123 bulks are prepared with nominal compositions Gd123+(0.4-x)Gd211+xM2411+0.1BaO2 in a molar ratio with x ≤ 0-0.2. The addition of M2411 particles induced nanosized particles inside bulks. They are apparently distributed well under seeding positions, where fewer Gd211 particles are located. The observed nanosized particles assigned as M2411 may play the role of flux pinning centres, leading to an enhanced Jc. However, the addition of M2411 with x>0.12 leads to the appearance of excess liquid and macrodefects in the bulks. Enhanced interfacial stress induced by the excess M2411 addition was found, together with modified local chemical compositions. These results account for both the suppression of the superconducting properties and the formation of the band structure in the present system.
| Original language | English |
|---|---|
| Article number | 012 |
| Pages (from-to) | 1285-1290 |
| Number of pages | 6 |
| Journal | Superconductor Science and Technology |
| Volume | 19 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2006 Nov 1 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
Cite this
Transmission electron microscopy of air-processed Gd123 superconductors with the addition of Gd2Ba4MCuOx (M ≤ Mo, Zr). / Xu, Caixuan; Hu, Anming; Ichihara, Masaki; Sakai, Naomichi; Hirabayashi, Izumi; Izumi, Mitsuru.
In: Superconductor Science and Technology, Vol. 19, No. 12, 012, 01.11.2006, p. 1285-1290.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Transmission electron microscopy of air-processed Gd123 superconductors with the addition of Gd2Ba4MCuOx (M ≤ Mo, Zr)
AU - Xu, Caixuan
AU - Hu, Anming
AU - Ichihara, Masaki
AU - Sakai, Naomichi
AU - Hirabayashi, Izumi
AU - Izumi, Mitsuru
PY - 2006/11/1
Y1 - 2006/11/1
N2 - We have studied the microstructure of melt-growth GdBa2Cu 3O7-δ (Gd123) bulk superconductors with the addition of Gd2Ba4CuMOx (abbreviated as M2411 with M ≤ Mo or Zr) particles by transmission electron microscopy. Gd123 bulks are prepared with nominal compositions Gd123+(0.4-x)Gd211+xM2411+0.1BaO2 in a molar ratio with x ≤ 0-0.2. The addition of M2411 particles induced nanosized particles inside bulks. They are apparently distributed well under seeding positions, where fewer Gd211 particles are located. The observed nanosized particles assigned as M2411 may play the role of flux pinning centres, leading to an enhanced Jc. However, the addition of M2411 with x>0.12 leads to the appearance of excess liquid and macrodefects in the bulks. Enhanced interfacial stress induced by the excess M2411 addition was found, together with modified local chemical compositions. These results account for both the suppression of the superconducting properties and the formation of the band structure in the present system.
AB - We have studied the microstructure of melt-growth GdBa2Cu 3O7-δ (Gd123) bulk superconductors with the addition of Gd2Ba4CuMOx (abbreviated as M2411 with M ≤ Mo or Zr) particles by transmission electron microscopy. Gd123 bulks are prepared with nominal compositions Gd123+(0.4-x)Gd211+xM2411+0.1BaO2 in a molar ratio with x ≤ 0-0.2. The addition of M2411 particles induced nanosized particles inside bulks. They are apparently distributed well under seeding positions, where fewer Gd211 particles are located. The observed nanosized particles assigned as M2411 may play the role of flux pinning centres, leading to an enhanced Jc. However, the addition of M2411 with x>0.12 leads to the appearance of excess liquid and macrodefects in the bulks. Enhanced interfacial stress induced by the excess M2411 addition was found, together with modified local chemical compositions. These results account for both the suppression of the superconducting properties and the formation of the band structure in the present system.
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UR - http://www.scopus.com/inward/citedby.url?scp=33846095882&partnerID=8YFLogxK
U2 - 10.1088/0953-2048/19/12/012
DO - 10.1088/0953-2048/19/12/012
M3 - Article
VL - 19
SP - 1285
EP - 1290
JO - Superconductor Science and Technology
JF - Superconductor Science and Technology
SN - 0953-2048
IS - 12
M1 - 012
ER -