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Iowa State University

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Lanthanum compounds

2011

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Full-Text Articles in Physics

Flux Requirements For The Growth Of Rfeaso (R = Rare Earth) Superconductors, J.-Q. Yan, Brandt A. Jensen, Kevin W. Dennis, R. William Mccallum, Thomas A. Lograsso Feb 2011

Flux Requirements For The Growth Of Rfeaso (R = Rare Earth) Superconductors, J.-Q. Yan, Brandt A. Jensen, Kevin W. Dennis, R. William Mccallum, Thomas A. Lograsso

Ames Laboratory Publications

Millimeter-sized LaFeAsO single crystals have been successfully grown out of NaAs flux starting with (LaAs+1/2Fe2O3):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 ofRFeAsO 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 ...