Flux requirements for the growth of RFeAsO (R=rare earth) superconductors

J. Q. Yan; B. Jensen; K. W. Dennis; R. W. McCallum; T. A. Lograsso

doi:10.1063/1.3555632

Flux requirements for the growth of RFeAsO (R=rare earth) superconductors

J. Q. Yan, B. Jensen, K. W. Dennis, R. W. McCallum, T. A. Lograsso

Correlated Electron Materials

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14 Scopus citations

Abstract

Millimeter-sized LaFeAsO single crystals have been successfully grown out of NaAs flux starting with (LaAs+1/2 Fe₂ O₃):20NaAs. The factors which allow the growth of these crystals out of NaAs but not out of many other fluxes, such as FeAs, have been investigated. X-ray powder diffraction found that NaAs synthesized for the growth of RFeAsO superconductors has monoclinic LiAs structure. Thermal analysis confirmed that NaAs melts congruently at about 600 °C. The ability to extract RFeAsO crystals from this NaAs flux suggests that NaAs has a significant oxygen solubility, possibly due to the formation of the ternary compound NaAsO₂, and enough oxygen diffusivity to transport solute to the growth front. Oxygen solubility and diffusivity are two important factors in searching for an alternative environmentally benign flux for the growth of RFeAsO superconductors.

Original language	English
Article number	072504
Journal	Applied Physics Letters
Volume	98
Issue number	7
DOIs	https://doi.org/10.1063/1.3555632
State	Published - Feb 14 2011

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abstract = "Millimeter-sized LaFeAsO single crystals have been successfully grown out of NaAs flux starting with (LaAs+1/2 Fe2 O3):20NaAs. The factors which allow the growth of these crystals out of NaAs but not out of many other fluxes, such as FeAs, have been investigated. X-ray powder diffraction found that NaAs synthesized for the growth of RFeAsO superconductors has monoclinic LiAs structure. Thermal analysis confirmed that NaAs melts congruently at about 600 °C. The ability to extract RFeAsO crystals from this NaAs flux suggests that NaAs has a significant oxygen solubility, possibly due to the formation of the ternary compound NaAsO2, and enough oxygen diffusivity to transport solute to the growth front. Oxygen solubility and diffusivity are two important factors in searching for an alternative environmentally benign flux for the growth of RFeAsO superconductors.",

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AU - Lograsso, T. A.

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Flux requirements for the growth of RFeAsO (R=rare earth) superconductors

Abstract

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