Structure and superconducting properties of (Tl0.8Bi0.2)(Sr1.6Ba0.4)Ca2Cu3O9-δ

N. H. Hur; B. C. Chakoumakos; M. Paranthaman; J. R. Thompson; D. K. Christen

doi:10.1016/0921-4534(95)00453-X

Structure and superconducting properties of (Tl_0.8Bi_0.2)(Sr_1.6Ba_0.4)Ca₂Cu₃O_9-δ

N. H. Hur, B. C. Chakoumakos, M. Paranthaman, J. R. Thompson, D. K. Christen

Research output: Contribution to journal › Article › peer-review

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Abstract

The "1223" structural type of high temperature superconductor, (Tl_0.8Bi_0.2)(Sr_1.6Ba_0.4)Ca₂Cu₃O_9-δ (referred to as Tl,Bi-1223), based on oxides of thallium and bismuth has been prepared by reaction of prereacted powders of (Sr_1.6Ba_0.4)Ca₂Cu₃O₇ with Tl₂O₃ and Bi₂O₃. The as-synthesized material has a superconducting transition temperature (T_c) of 113 K, which is relatively unaffected by post-annealing either in an oxygen or an argon atmosphere. Polycrystalline samples of Tl,Bi-1223 exhibit a high persistent current density (J_p) of 1.62 × 10⁷ A/cm² at 5 K and 1 tesla, and maintain significant J_p values to temperatures over 60 K. The structure of Tl,Bi-1223 has been refined using neutron powder diffraction data. The crystal structure is quite similar to those of Tl-1223 related compounds, P4/mmm symmetry with a = 3.8211 A ̊ and c = 15.4235 A ̊. The atomic sites of thallium and oxygen in the rock-salt TlO plane are slightly vacant and occupancies of the sites were determined by the neutron diffraction study.

Original language	English
Pages (from-to)	109-114
Number of pages	6
Journal	Physica C: Superconductivity and its Applications
Volume	253
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-4534(95)00453-X
State	Published - Oct 20 1995

Funding

We are grateful to Ms. Nancy Delene for her assistanceT.h e researcha t Oak Ridge NationalL ab-oratory was sponsoredb y the Division of Materials SciencesU, .S. Departmenotf Energy and technology developmenftu nded by the Oak Ridge Superconducting Technology for Electric Energy Systems Program,A dvancedU tility ConceptsD ivision,Con-servationa nd RenewableE nergyP rogram,U .S. De-partmenot f Energy, both under contractD E-AC-05-84OR21400w ith LockheedM artinEnergy Systems, Inc. One of us (N.H.H.) also thanks KOSEF (Korea Science and EngineeringF oundation)fo r financial support.

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10.1016/0921-4534(95)00453-X

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title = "Structure and superconducting properties of (Tl0.8Bi0.2)(Sr1.6Ba0.4)Ca2Cu3O9-δ",

abstract = "The {"}1223{"} structural type of high temperature superconductor, (Tl0.8Bi0.2)(Sr1.6Ba0.4)Ca2Cu3O9-δ (referred to as Tl,Bi-1223), based on oxides of thallium and bismuth has been prepared by reaction of prereacted powders of (Sr1.6Ba0.4)Ca2Cu3O7 with Tl2O3 and Bi2O3. The as-synthesized material has a superconducting transition temperature (Tc) of 113 K, which is relatively unaffected by post-annealing either in an oxygen or an argon atmosphere. Polycrystalline samples of Tl,Bi-1223 exhibit a high persistent current density (Jp) of 1.62 × 107 A/cm2 at 5 K and 1 tesla, and maintain significant Jp values to temperatures over 60 K. The structure of Tl,Bi-1223 has been refined using neutron powder diffraction data. The crystal structure is quite similar to those of Tl-1223 related compounds, P4/mmm symmetry with a = 3.8211 A ̊ and c = 15.4235 A ̊. The atomic sites of thallium and oxygen in the rock-salt TlO plane are slightly vacant and occupancies of the sites were determined by the neutron diffraction study.",

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AU - Paranthaman, M.

AU - Thompson, J. R.

AU - Christen, D. K.

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N2 - The "1223" structural type of high temperature superconductor, (Tl0.8Bi0.2)(Sr1.6Ba0.4)Ca2Cu3O9-δ (referred to as Tl,Bi-1223), based on oxides of thallium and bismuth has been prepared by reaction of prereacted powders of (Sr1.6Ba0.4)Ca2Cu3O7 with Tl2O3 and Bi2O3. The as-synthesized material has a superconducting transition temperature (Tc) of 113 K, which is relatively unaffected by post-annealing either in an oxygen or an argon atmosphere. Polycrystalline samples of Tl,Bi-1223 exhibit a high persistent current density (Jp) of 1.62 × 107 A/cm2 at 5 K and 1 tesla, and maintain significant Jp values to temperatures over 60 K. The structure of Tl,Bi-1223 has been refined using neutron powder diffraction data. The crystal structure is quite similar to those of Tl-1223 related compounds, P4/mmm symmetry with a = 3.8211 A ̊ and c = 15.4235 A ̊. The atomic sites of thallium and oxygen in the rock-salt TlO plane are slightly vacant and occupancies of the sites were determined by the neutron diffraction study.

AB - The "1223" structural type of high temperature superconductor, (Tl0.8Bi0.2)(Sr1.6Ba0.4)Ca2Cu3O9-δ (referred to as Tl,Bi-1223), based on oxides of thallium and bismuth has been prepared by reaction of prereacted powders of (Sr1.6Ba0.4)Ca2Cu3O7 with Tl2O3 and Bi2O3. The as-synthesized material has a superconducting transition temperature (Tc) of 113 K, which is relatively unaffected by post-annealing either in an oxygen or an argon atmosphere. Polycrystalline samples of Tl,Bi-1223 exhibit a high persistent current density (Jp) of 1.62 × 107 A/cm2 at 5 K and 1 tesla, and maintain significant Jp values to temperatures over 60 K. The structure of Tl,Bi-1223 has been refined using neutron powder diffraction data. The crystal structure is quite similar to those of Tl-1223 related compounds, P4/mmm symmetry with a = 3.8211 A ̊ and c = 15.4235 A ̊. The atomic sites of thallium and oxygen in the rock-salt TlO plane are slightly vacant and occupancies of the sites were determined by the neutron diffraction study.

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Structure and superconducting properties of (Tl_0.8Bi_0.2)(Sr_1.6Ba_0.4)Ca₂Cu₃O_9-δ

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