Year: 2025
Type: article
Abstract: Reacting praseodymium(IV) oxide with oxygen at 27 GPa in a diamond anvil cell yielded the oxide peroxide Pr 2 IV (O 2 )O 3 , which was characterized by single crystal X‐ray diffraction on multi‐grain samples, Raman spectroscopy and quantum theoretical calculations at various pressure points. The presence of tetravalent praseodymium ions is supported by electronic structure calculations, showing a band gap of ca. 1.2 eV, which is consistent with the anticipated chemical model of an ionic solid. Pr 2 (O 2 )O 3 thus far represents the most oxygen rich phase of any binary compound of a lanthanoid and oxygen and is the first example of a peroxide anion next to Pr 4+ . Additionally, these results demonstrate that instead of oxidizing the praseodymium ions past their +IV oxidation state, oxygen undergoes a comproportionation to form peroxide anions. Direct oxidation of the oxide anions by Pr 4+ ‐ions was ruled out by a control experiment in argon instead of oxygen, where no oxidation of oxide ions was observed.
Language: English
Subfield: Geophysics
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $5,510
Funders: National Science Foundation, U.S. Department of Energy, University of Chicago, Swedish e-Science Research Centre, European Commission, Deutsche Forschungsgemeinschaft, European Synchrotron Radiation Facility, National Science Council, Linköpings Universitet, Knut och Alice Wallenbergs Stiftelse, Vetenskapsrådet, China Scholarship Council, Office of Science, Deutsches Elektronen-Synchrotron, National Supercomputer Centre, Linköpings Universitet, Division of Earth Sciences, Argonne National Laboratory, HORIZON EUROPE European Research Council
Awards: G102163711, G1055550527, G107546177, G1313983767, Disclosing functionality of novel materials discovered at extreme conditions, G1441096865, G1664757510, G193668846, G2037445599, G2144212310, G2156986825, G2287611682, MRI: Acquisition of integrated optical spectroscopy system at the Advanced Photon Source, G2509613613, G262962599, G3075337988, G3321450376, G3438891359, G3479632140, G3631573628, G3635708190, G3983392107, G4122809122, Facility Support: GeoSoilEnviroCARS: A National Resource for Earth, Planetary, Soil and Environmental Science Research at the APS, G498139845, G513797252, G5331847957, G5663011202, G5912518634, Controlling metastable phases of novel nitrides and oxides: from discoveries at extreme conditions towards advanced technological applications, G6092972593, G6256534168, G6533660618, G6625919268, G663679826, G671512426, G6830658824, G6848031779, G6918803902, G712881263, G7318745325, High-pressure nitride materials: towards the controllable and scalable synthesis in a diamond anvil cell, G7711467243, G7864457617, G796431723, G834796695, G8436673617, G8849113618, NAISS, G969889393, G993149817
OpenAlex ID: W4407092387