TY  - JOUR
AU  - Smuda, Matthias
AU  - Finzel, Kati
AU  - Hantusch, Martin
AU  - Ströh, Jonas
AU  - Pienack, Nicole
AU  - Khadiev, Azat
AU  - Terraschke, Huayna
AU  - Ruck, Michael
AU  - Doert, Thomas
TI  - 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
JO  - Dalton transactions
VL  - 50
SN  - 0300-9246
CY  - London
PB  - Soc.
M1  - PUBDB-2021-05068
SP  - 17665 - 17674
PY  - 2021
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - 34806720
UR  - <Go to ISI:>//WOS:000720971000001
DO  - DOI:10.1039/D1DT03199F
UR  - https://bib-pubdb1.desy.de/record/472515
ER  -