View in EDS

Low-temperature synthesis of superconducting iron selenide using a triphenylphosphine flux.

Saved in:
Bibliographic Details
Title: Low-temperature synthesis of superconducting iron selenide using a triphenylphosphine flux.
Authors: Fallon, M. Jewels1 (AUTHOR), Martinolich, Andrew J.1 (AUTHOR), Maughan, Annalise E.1 (AUTHOR), Gallington, Leighanne C.2 (AUTHOR), Neilson, James R.1 (AUTHOR) James.Neilson@colostate.edu
Source: Dalton Transactions: An International Journal of Inorganic Chemistry. 11/21/2019, Vol. 48 Issue 43, p16298-16303. 6p.
Subjects: Iron selenides, Nuclear magnetic resonance spectroscopy, X-ray powder diffraction, Solution (Chemistry), X-ray diffraction measurement, Flux (Energy)
Abstract: 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. [ABSTRACT FROM AUTHOR]
Copyright of Dalton Transactions: An International Journal of Inorganic Chemistry is the property of Royal Society of Chemistry and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract: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. [ABSTRACT FROM AUTHOR]
ISSN:14779226
DOI:10.1039/c9dt03723c