%0 Journal Article
%A Smuda, Matthias
%A Finzel, Kati
%A Hantusch, Martin
%A Ströh, Jonas
%A Pienack, Nicole
%A Khadiev, Azat
%A Terraschke, Huayna
%A Ruck, Michael
%A Doert, Thomas
%T Formation of Bi<sub>2</sub>Ir nanoparticles in a microwave-assisted polyol process revealing the suboxide Bi<sub>4</sub>Ir<sub>2</sub>O
%J Dalton transactions
%V 50
%@ 0300-9246
%C London
%I Soc.
%M PUBDB-2021-05068
%P 17665 - 17674
%D 2021
%X 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<sub>3</sub>)<sub>3</sub> and Ir(OAc)<sub>3</sub>, the new suboxide Bi<sub>4</sub>Ir<sub>2</sub>O forms as an intermediate phase at about 160 °C. Its structure was determined by a combination of PXRD and quantum-chemical calculations. Bi<sub>4</sub>Ir<sub>2</sub>O decomposes in vacuum at about 250 °C and is reduced to Bi<sub>2</sub>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.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ 34806720
%U <Go to ISI:>//WOS:000720971000001
%R 10.1039/D1DT03199F
%U https://bib-pubdb1.desy.de/record/472515