AI Article Synopsis
- - The study examined the chemical reaction of praseodymium oxide (PrO) with silicon oxide (SiO) at pressures up to 29 GPa using advanced techniques like laser heating and single-crystal analysis.
- - Different compounds formed at various pressures: Pr(SiO) at 5 and 10 GPa, and PrSiO and Pr(O)O at 15 GPa, with PrSiO being a new high-pressure modification of Pr(SiO).
- - The findings reveal praseodymium in the +IV oxidation state at 29 GPa and show that these new Pr-based silicates remain stable when pressure is released, suggesting they are unique representatives of praseodymium salts with
Article Abstract
The reaction between PrO and SiO was investigated at various pressure points up to 29 GPa in a diamond anvil cell using laser heating and in situ single-crystal structure analysis. The pressure points at 5 and 10 GPa produced Pr(SiO), whereas PrSiO and Pr(O)O were obtained at 15 GPa. PrSiO can be interpreted as a high-pressure modification of the still unknown orthosilicate Pr(SiO). PrSiO and PrSiO that contain praseodymium in its rare + IV oxidation state were identified at 29 GPa. After the pressure was released from the reaction chamber, the Pr(IV) silicates could be recovered, indicating that they are metastable at ambient pressure. Density functional theory calculations of the electronic structure corroborate the oxidation state of praseodymium in both PrSiO and PrSiO. Both silicates are the first structurally characterized representatives of Pr-containing salts with oxoanions. All three silicates contain condensed networks of [SiO] octahedra which is unprecedented in the rich chemistry of lanthanoid silicates.
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| http://dx.doi.org/10.1021/acs.inorgchem.3c03948 | DOI Listing |
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