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  Formation of Bi2Ir nanoparticles in a microwave-assisted polyol process revealing the suboxide Bi4Ir2O

Smuda, M., Finzel, K., Hantusch, M., Stroeh, J., Pienack, N., Khadiev, A., et al. (2021). Formation of Bi2Ir nanoparticles in a microwave-assisted polyol process revealing the suboxide Bi4Ir2O. Dalton Transactions, 50(47), 17665-17674. doi:10.1039/d1dt03199f.

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 Creators:
Smuda, Matthias1, Author
Finzel, Kati1, Author
Hantusch, Martin1, Author
Stroeh, Jonas1, Author
Pienack, Nicole1, Author
Khadiev, Azat1, Author
Terraschke, Huayna1, Author
Ruck, Michael2, Author              
Doert, Thomas1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Michael Ruck, Max Planck Fellow, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863444              

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 Abstract: Intermetallic phases are usually obtained by crystallization from the melt. However, phases containing elements with widely different melting and boiling points, as well as nanoparticles, which provide a high specific surface area, are hardly accessible via such a high-temperature process. The polyol process is one option to circumvent these obstacles by using a solution-based approach at moderate temperatures. In this study, the formation of Bi2Ir nanoparticles in a microwave-assisted polyol process was investigated. Solutions were analyzed using UV-Vis spectroscopy and the reaction was tracked with synchrotron-based in situ powder X-ray diffraction (PXRD). The products were characterized by PXRD and high-resolution transmission electron microscopy. Starting from Bi(NO3)(3) and Ir(OAc)(3), the new suboxide Bi4Ir2O forms as an intermediate phase at about 160 degrees C. Its structure was determined by a combination of PXRD and quantum-chemical calculations. Bi4Ir2O decomposes in vacuum at about 250 degrees C and is reduced to Bi2Ir by hydrogen at 150 degrees C. At about 240 degrees C, the polyol process leads to the immediate reduction of the two metal-containing precursors and crystallization of Bi2Ir nanoparticles.

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Language(s): eng - English
 Dates: 2021-11-152021-11-15
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000720971000001
DOI: 10.1039/d1dt03199f
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Title: Dalton Transactions
  Abbreviation : Dalton Trans.
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 50 (47) Sequence Number: - Start / End Page: 17665 - 17674 Identifier: ISSN: 1477-9226
CoNE: https://pure.mpg.de/cone/journals/resource/954925269323