Improvement of critical current density in MgB2 superconductors by Zr doping at ambient pressure

Y. Feng; Y. Zhao; Y. P. Sun; F. C. Liu; B. Q. Fu; L. Zhou; C. H. Cheng; N. Koshizuka; M. Murakami

doi:10.1063/1.1426264

Improvement of critical current density in MgB₂ superconductors by Zr doping at ambient pressure

Y. Feng, Y. Zhao, Y. P. Sun, F. C. Liu, B. Q. Fu, L. Zhou, C. H. Cheng, N. Koshizuka, M. Murakami

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Abstract

We present the superconducting properties and phase compositions of Mg_1-xZr_xB₂ bulk samples fabricated by a solid-state reaction at ambient pressure. It is found that a small amount of Zr atoms may be introduced into the lattice of MgB₂, while the majority of them forms ZrB₂ phase. The Mg_0.9Zr_0.1B₂ sample shows the highest J_C of 2.1×10⁶ A/cm² in 0.56 T at 5 K and 1.83×10⁶ A/cm² in self-field at 20 K, higher irreversibility field and larger upper critical field in MgB₂ bulk samples. The combination of good grain connection, the reduction of grain size and small ZrB₂ particles in the sample may be responsible for the significant enhancement of J_C in Zr-doped samples. This technique has a great potential to prepare high performance MgB₂ bulk samples and wires on an industrial scale.

Original language	English
Pages (from-to)	3983-3985
Number of pages	3
Journal	Applied Physics Letters
Volume	79
Issue number	24
DOIs	https://doi.org/10.1063/1.1426264
State	Published - 10 Dec 2001
Externally published	Yes

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title = "Improvement of critical current density in MgB2 superconductors by Zr doping at ambient pressure",

abstract = "We present the superconducting properties and phase compositions of Mg1-xZrxB2 bulk samples fabricated by a solid-state reaction at ambient pressure. It is found that a small amount of Zr atoms may be introduced into the lattice of MgB2, while the majority of them forms ZrB2 phase. The Mg0.9Zr0.1B2 sample shows the highest JC of 2.1×106 A/cm2 in 0.56 T at 5 K and 1.83×106 A/cm2 in self-field at 20 K, higher irreversibility field and larger upper critical field in MgB2 bulk samples. The combination of good grain connection, the reduction of grain size and small ZrB2 particles in the sample may be responsible for the significant enhancement of JC in Zr-doped samples. This technique has a great potential to prepare high performance MgB2 bulk samples and wires on an industrial scale.",

author = "Y. Feng and Y. Zhao and Sun, {Y. P.} and Liu, {F. C.} and Fu, {B. Q.} and L. Zhou and Cheng, {C. H.} and N. Koshizuka and M. Murakami",

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doi = "10.1063/1.1426264",

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T1 - Improvement of critical current density in MgB2 superconductors by Zr doping at ambient pressure

AU - Feng, Y.

AU - Zhao, Y.

AU - Sun, Y. P.

AU - Liu, F. C.

AU - Fu, B. Q.

AU - Zhou, L.

AU - Cheng, C. H.

AU - Koshizuka, N.

AU - Murakami, M.

PY - 2001/12/10

Y1 - 2001/12/10

N2 - We present the superconducting properties and phase compositions of Mg1-xZrxB2 bulk samples fabricated by a solid-state reaction at ambient pressure. It is found that a small amount of Zr atoms may be introduced into the lattice of MgB2, while the majority of them forms ZrB2 phase. The Mg0.9Zr0.1B2 sample shows the highest JC of 2.1×106 A/cm2 in 0.56 T at 5 K and 1.83×106 A/cm2 in self-field at 20 K, higher irreversibility field and larger upper critical field in MgB2 bulk samples. The combination of good grain connection, the reduction of grain size and small ZrB2 particles in the sample may be responsible for the significant enhancement of JC in Zr-doped samples. This technique has a great potential to prepare high performance MgB2 bulk samples and wires on an industrial scale.

AB - We present the superconducting properties and phase compositions of Mg1-xZrxB2 bulk samples fabricated by a solid-state reaction at ambient pressure. It is found that a small amount of Zr atoms may be introduced into the lattice of MgB2, while the majority of them forms ZrB2 phase. The Mg0.9Zr0.1B2 sample shows the highest JC of 2.1×106 A/cm2 in 0.56 T at 5 K and 1.83×106 A/cm2 in self-field at 20 K, higher irreversibility field and larger upper critical field in MgB2 bulk samples. The combination of good grain connection, the reduction of grain size and small ZrB2 particles in the sample may be responsible for the significant enhancement of JC in Zr-doped samples. This technique has a great potential to prepare high performance MgB2 bulk samples and wires on an industrial scale.

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JO - Applied Physics Letters

JF - Applied Physics Letters

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Improvement of critical current density in MgB₂ superconductors by Zr doping at ambient pressure

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