Journal Article

PUBDB-2021-05068

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Formation of Bi$_2$Ir nanoparticles in a microwave-assisted polyol process revealing the suboxide Bi$_4$Ir$_2$O

Smuda, M.Extern* ; Finzel, K. ; Hantusch, M.Extern* ; Ströh, J.Extern* ; Pienack, N.Extern* ; Khadiev, A.DESY* ; Terraschke, H.Extern* ; Ruck, M.Extern* ; Doert, T. (Corresponding author)Extern*

2021
Soc. London

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Please use a persistent id in citations: doi:10.1039/D1DT03199F  doi:10.3204/PUBDB-2021-05068

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(NO$_3$)$_3$ and Ir(OAc)$_3$, the new suboxide Bi$_4$Ir$_2$O forms as an intermediate phase at about 160 °C. Its structure was determined by a combination of PXRD and quantum-chemical calculations. Bi$_4$Ir$_2$O decomposes in vacuum at about 250 °C and is reduced to Bi$_2$Ir 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.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Experimentebetreuung PETRA III (FS-PET-D)
3. TU Dresden (UDresden)
4. Uni Kiel (UKiel)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)

Experiment(s):

1. PETRA Beamline P23 (PETRA III)

Appears in the scientific report 2021

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Database coverage:
; ; Allianz-Lizenz / DFG ; Chemical Reactions ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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