Stability of Growing Front of YBa(2)Cu(3)O(x) Superconductor in the Presence of Pt and CeO(2) Additions

Gregory Kozlowski; Tom Svobodny

doi:10.1063/1.114785

Stability of Growing Front of YBa(2)Cu(3)O(x) Superconductor in the Presence of Pt and CeO(2) Additions

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Abstract

Distinctive microstructures of textured YBa 2 Cu 3 O x (123) superconductors were examined by scanning electron microscopy and metallurgical microscopy. The samples were synthesized under a residual thermal gradient by using a modified melt textured growth on a Y 2 BaCuO 5 (211) substrate. Also, the unidirectional solidification by a zone&hyphen;melting method was performed to fabricate 123 superconducting bars up to 12 cm long placed on the 211 substrate in the horizontal arrangement, with a growth rate R =0.5 mm/h and a temperature gradient of G =20 °C/cm ( G / R =400 °C h/cm 2 ). A ramping temperature of 1 °C/h ( GR ) was applied in both syntheses. Typical defects running parallel to (001) planes associated with 211 trapped particles were observed (so&hyphen;called platelet structure). Besides these, unusual defects were observed running parallel to (100) and (010) planes in textured 123+Pt superconductors, and interpreted as the result of an instability of the planar front in the presence of fine 211 particles. A theoretical model of planar interface stability confirms a strong dependence of stability region on the size of 211 particles in the melt.

Original language	American English
Journal	Applied Physics Letters
Volume	67
DOIs	https://doi.org/10.1063/1.114785
State	Published - Jul 10 1995

Disciplines

Applied Mathematics
Applied Statistics
Mathematics
Physics

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Stability of Growing Front of YBa(2)Cu(3)O(x) Superconductor in tFinal published version, 528 KBLicense: CC BY

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title = "Stability of Growing Front of YBa(2)Cu(3)O(x) Superconductor in the Presence of Pt and CeO(2) Additions",

abstract = " Distinctive microstructures of textured YBa 2 Cu 3 O x (123) superconductors were examined by scanning electron microscopy and metallurgical microscopy. The samples were synthesized under a residual thermal gradient by using a modified melt textured growth on a Y 2 BaCuO 5 (211) substrate. Also, the unidirectional solidification by a zone&hyphen;melting method was performed to fabricate 123 superconducting bars up to 12 cm long placed on the 211 substrate in the horizontal arrangement, with a growth rate R =0.5 mm/h and a temperature gradient of G =20 °C/cm ( G / R =400 °C h/cm 2 ). A ramping temperature of 1 °C/h ( GR ) was applied in both syntheses. Typical defects running parallel to (001) planes associated with 211 trapped particles were observed (so&hyphen;called platelet structure). Besides these, unusual defects were observed running parallel to (100) and (010) planes in textured 123+Pt superconductors, and interpreted as the result of an instability of the planar front in the presence of fine 211 particles. A theoretical model of planar interface stability confirms a strong dependence of stability region on the size of 211 particles in the melt.",

author = "Gregory Kozlowski and Tom Svobodny",

year = "1995",

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doi = "10.1063/1.114785",

language = "American English",

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journal = "Applied Physics Letters",

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T1 - Stability of Growing Front of YBa(2)Cu(3)O(x) Superconductor in the Presence of Pt and CeO(2) Additions

AU - Kozlowski, Gregory

AU - Svobodny, Tom

PY - 1995/7/10

Y1 - 1995/7/10

N2 - Distinctive microstructures of textured YBa 2 Cu 3 O x (123) superconductors were examined by scanning electron microscopy and metallurgical microscopy. The samples were synthesized under a residual thermal gradient by using a modified melt textured growth on a Y 2 BaCuO 5 (211) substrate. Also, the unidirectional solidification by a zone&hyphen;melting method was performed to fabricate 123 superconducting bars up to 12 cm long placed on the 211 substrate in the horizontal arrangement, with a growth rate R =0.5 mm/h and a temperature gradient of G =20 °C/cm ( G / R =400 °C h/cm 2 ). A ramping temperature of 1 °C/h ( GR ) was applied in both syntheses. Typical defects running parallel to (001) planes associated with 211 trapped particles were observed (so&hyphen;called platelet structure). Besides these, unusual defects were observed running parallel to (100) and (010) planes in textured 123+Pt superconductors, and interpreted as the result of an instability of the planar front in the presence of fine 211 particles. A theoretical model of planar interface stability confirms a strong dependence of stability region on the size of 211 particles in the melt.

AB - Distinctive microstructures of textured YBa 2 Cu 3 O x (123) superconductors were examined by scanning electron microscopy and metallurgical microscopy. The samples were synthesized under a residual thermal gradient by using a modified melt textured growth on a Y 2 BaCuO 5 (211) substrate. Also, the unidirectional solidification by a zone&hyphen;melting method was performed to fabricate 123 superconducting bars up to 12 cm long placed on the 211 substrate in the horizontal arrangement, with a growth rate R =0.5 mm/h and a temperature gradient of G =20 °C/cm ( G / R =400 °C h/cm 2 ). A ramping temperature of 1 °C/h ( GR ) was applied in both syntheses. Typical defects running parallel to (001) planes associated with 211 trapped particles were observed (so&hyphen;called platelet structure). Besides these, unusual defects were observed running parallel to (100) and (010) planes in textured 123+Pt superconductors, and interpreted as the result of an instability of the planar front in the presence of fine 211 particles. A theoretical model of planar interface stability confirms a strong dependence of stability region on the size of 211 particles in the melt.

UR - https://corescholar.libraries.wright.edu/physics/222

U2 - 10.1063/1.114785

DO - 10.1063/1.114785

M3 - Article

VL - 67

JO - Applied Physics Letters

JF - Applied Physics Letters

ER -

Stability of Growing Front of YBa(2)Cu(3)O(x) Superconductor in the Presence of Pt and CeO(2) Additions

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