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Low-Temperature Synthesis of Superconducting Iron Selenide Using a Triphenylphosphine Flux


Many functional materials have relatively low decomposition temperatures (T < 400 C), which makes their synthesis challenging using conventional high-temperature solid-state chemistry. Therefore, non-conventional techniques such as metathesis, hydrothermal, and solution chemistry are often employed to access low-temperature phases; the discovery of new chemistries is needed to expand access to these phases. This contribution discusses the use of triphenylphosphine (PPh3) as a molten flux to synthesize superconducting iron selenide (Fe1+δSe) at low temperature (T = 325 C). Powder X-ray diffraction and magnetism measurements confirm the successful formation of superconducting iron selenide while nuclear magnetic resonance spectroscopy and in situ X-ray diffraction show that the formation of superconducting FeSe at low temperatures is enabled by an adduct between the triphenylphosphine and selenium. Exploration of the Fe-Se-PPh3 phase space indicate that the PPh3-Se adduct effectively reduces the chemical potential of the selenium at high concentrations of triphenylphosphine. This contribution demonstrates that the use of a poorly-solvating yet reactive flux has the potential to enable the synthesis of new low temperature phases of solid materials.

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Publication details

The article was accepted on 07 Oct 2019 and first published on 08 Oct 2019

Article type: Paper
DOI: 10.1039/C9DT03723C
Dalton Trans., 2019, Accepted Manuscript

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    Low-Temperature Synthesis of Superconducting Iron Selenide Using a Triphenylphosphine Flux

    J. Fallon, A. Martinolich, A. Maughan, L. C. Gallington and J. R. Neilson, Dalton Trans., 2019, Accepted Manuscript , DOI: 10.1039/C9DT03723C

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