Phase separation in carbon-doped MgB2 superconductors

I. Maurin; S. Margadonna; K. Prassides; T. Takenobu; T. Ito; D. H. Chi; Y. Iwasa; A. Fitch

doi:10.1016/S0921-4526(02)00811-6

Phase separation in carbon-doped MgB₂ superconductors

I. Maurin, S. Margadonna, K. Prassides^*, T. Takenobu, T. Ito, D. H. Chi, Y. Iwasa, A. Fitch

^*Corresponding author for this work

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

33 Citations (Scopus)

Abstract

High-resolution synchrotron X-ray powder diffraction measurements have been carried out on superconducting MgB_2-xC_x (0 ≤ x ≤ 0.1) phases. The carbon miscibility in the hexagonal AlB₂-type structure is very small, x < 0.04. At higher carbon contents, macroscopic phase separation occurs leading to the coexistence of at least two phases, isostructural with the parent MgB₂ compound. The coexisting phases differ mainly in their in-plane lattice constants, suggesting that boron is substituted by carbon in the boron layers, but in different concentrations. The multiphase samples still show a clear one-step superconducting transition and full shielding, χ = -1/4π.

Original language	English
Pages (from-to)	392-397
Number of pages	6
Journal	Physica B: Condensed Matter
Volume	318
Issue number	4
DOIs	https://doi.org/10.1016/S0921-4526(02)00811-6
Publication status	Published - 2002 Jun
Externally published	Yes

Keywords

Carbon doping
MgB superconductor
Phase separation
X-ray diffraction

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics

Access to Document

10.1016/S0921-4526(02)00811-6

Cite this

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title = "Phase separation in carbon-doped MgB2 superconductors",

abstract = "High-resolution synchrotron X-ray powder diffraction measurements have been carried out on superconducting MgB2-xCx (0 ≤ x ≤ 0.1) phases. The carbon miscibility in the hexagonal AlB2-type structure is very small, x < 0.04. At higher carbon contents, macroscopic phase separation occurs leading to the coexistence of at least two phases, isostructural with the parent MgB2 compound. The coexisting phases differ mainly in their in-plane lattice constants, suggesting that boron is substituted by carbon in the boron layers, but in different concentrations. The multiphase samples still show a clear one-step superconducting transition and full shielding, χ = -1/4π.",

keywords = "Carbon doping, MgB superconductor, Phase separation, X-ray diffraction",

author = "I. Maurin and S. Margadonna and K. Prassides and T. Takenobu and T. Ito and Chi, {D. H.} and Y. Iwasa and A. Fitch",

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T1 - Phase separation in carbon-doped MgB2 superconductors

AU - Maurin, I.

AU - Margadonna, S.

AU - Prassides, K.

AU - Takenobu, T.

AU - Ito, T.

AU - Chi, D. H.

AU - Iwasa, Y.

AU - Fitch, A.

PY - 2002/6

Y1 - 2002/6

N2 - High-resolution synchrotron X-ray powder diffraction measurements have been carried out on superconducting MgB2-xCx (0 ≤ x ≤ 0.1) phases. The carbon miscibility in the hexagonal AlB2-type structure is very small, x < 0.04. At higher carbon contents, macroscopic phase separation occurs leading to the coexistence of at least two phases, isostructural with the parent MgB2 compound. The coexisting phases differ mainly in their in-plane lattice constants, suggesting that boron is substituted by carbon in the boron layers, but in different concentrations. The multiphase samples still show a clear one-step superconducting transition and full shielding, χ = -1/4π.

AB - High-resolution synchrotron X-ray powder diffraction measurements have been carried out on superconducting MgB2-xCx (0 ≤ x ≤ 0.1) phases. The carbon miscibility in the hexagonal AlB2-type structure is very small, x < 0.04. At higher carbon contents, macroscopic phase separation occurs leading to the coexistence of at least two phases, isostructural with the parent MgB2 compound. The coexisting phases differ mainly in their in-plane lattice constants, suggesting that boron is substituted by carbon in the boron layers, but in different concentrations. The multiphase samples still show a clear one-step superconducting transition and full shielding, χ = -1/4π.

KW - Carbon doping

KW - MgB superconductor

KW - Phase separation

KW - X-ray diffraction

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