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, Terraschke H, Ruck M, Doert T (2021)
Publication Type: Journal article
Publication year: 2021
Journal
Book Volume: 50
Pages Range: 17665-17674
Journal Issue: 47
DOI: 10.1039/d1dt03199f
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 °C. Its structure was determined by a combination of PXRD and quantum-chemical calculations. Bi4Ir2O decomposes in vacuum at about 250 °C and is reduced to Bi2Ir by hydrogen at 150 °C. At about 240 °C, the polyol process leads to the immediate reduction of the two metal-containing precursors and crystallization of Bi2Ir nanoparticles.
Involved external institutions
Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden
Germany (DE)
Christian-Albrechts-Universität zu Kiel
Germany (DE)
Deutsches Elektronen-Synchrotron DESY
Germany (DE)
Technische Universität Dresden
Germany (DE)
Germany (DE)
Christian-Albrechts-Universität zu Kiel
Germany (DE)
Deutsches Elektronen-Synchrotron DESY
Germany (DE)
Technische Universität Dresden
Germany (DE)
How to cite
APA:
Smuda, M., Finzel, K., Hantusch, M., Stroeh, J., Pienack, N., Khadiev, A.,... Doert, T. (2021). Formation of Bi2Ir nanoparticles in a microwave-assisted polyol process revealing the suboxide Bi4Ir2O. Dalton Transactions, 50(47), 17665-17674. https://doi.org/10.1039/d1dt03199f
MLA:
Smuda, Matthias, et al. "Formation of Bi2Ir nanoparticles in a microwave-assisted polyol process revealing the suboxide Bi4Ir2O." Dalton Transactions 50.47 (2021): 17665-17674.
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