Low-temperature synthesis of superconducting iron selenide using a triphenylphosphine flux
| Autor: | Leighanne C. Gallington, Annalise E. Maughan, M. Jewels Fallon, Andrew J. Martinolich, James R. Neilson |
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| Rok vydání: | 2019 |
| Předmět: |
Superconductivity
Materials science 010405 organic chemistry Magnetism chemistry.chemical_element Nuclear magnetic resonance spectroscopy 010402 general chemistry 01 natural sciences Decomposition Hydrothermal circulation 0104 chemical sciences Inorganic Chemistry chemistry.chemical_compound chemistry Selenide Physical chemistry Triphenylphosphine Selenium |
| Zdroj: | Dalton Transactions. 48:16298-16303 |
| ISSN: | 1477-9234 1477-9226 |
| DOI: | 10.1039/c9dt03723c |
| Popis: | 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 indicates 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. |
| Databáze: | OpenAIRE |
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