Home > Publications database > Formation of Bi$_2$Ir nanoparticles in a microwave-assisted polyol process revealing the suboxide Bi$_4$Ir$_2$O > print

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024 7 _ |a 0300-9246
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024 7 _ |a 1364-5447
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024 7 _ |a (2001)
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024 7 _ |a 1470-479X
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024 7 _ |a 1477-9226
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024 7 _ |a 1477-9234
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024 7 _ |a 2050-5671
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024 7 _ |a 10.3204/PUBDB-2021-05068
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100 1 _ |a Smuda, Matthias
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245 _ _ |a Formation of Bi$_2$Ir nanoparticles in a microwave-assisted polyol process revealing the suboxide Bi$_4$Ir$_2$O
260 _ _ |a London
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520 _ _ |a 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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700 1 _ |a Finzel, Kati
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700 1 _ |a Hantusch, Martin
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700 1 _ |a Ströh, Jonas
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700 1 _ |a Khadiev, Azat
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700 1 _ |a Terraschke, Huayna
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700 1 _ |a Ruck, Michael
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700 1 _ |a Doert, Thomas
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