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Zapp N, Kohlmann H. Ternary rare-earth hydride oxides: stability in air and potential use as precursors for the synthesis of materials. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2022. [DOI: 10.1515/znb-2021-0189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Ternary rare-earth hydride oxides (or oxyhydrides) REHO show rather high thermal stability and inertness in air. SmHO remained intact when stored in air for 12 h, while after storage for one year, it completely hydrolysed to form Sm(OH)3. In contrast, YHO and HoHO show only slight decomposition upon longer storage. The cation’s basicity and the air humidity apparently are crucial factors in the air stability of the compounds. Their reactions with various gases were investigated, in order to better understand factors governing the stability in air and to map their potential as precursors in materials synthesis. Both SmHO and YHO reduce CO2 to carbon and form the metastable C-type rare-earth sesquioxides RE
2O3 instead of the thermodynamically stable B-type. YHO reacts with gaseous ammonia to a red powder. By X-ray diffraction, this is identified as yttrium nitride, but the color of the sample suggests it to be an oxygen-poor nitride oxide (oxynitride) phase YN1−x
O
x
. These results underline the potential of rare-earth hydride oxides as precursors for the synthesis of other rare-earth compounds. The stability in air, even at elevated temperatures of some rare-earth hydride oxides such as YHO and HoHO are advantageous for potential applications as functional materials.
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Affiliation(s)
- Nicolas Zapp
- Institut für Anorganische Chemie, Leipzig University , Johannisallee 29, 04103 Leipzig , Germany
| | - Holger Kohlmann
- Institut für Anorganische Chemie, Leipzig University , Johannisallee 29, 04103 Leipzig , Germany
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Simon A. Oxidation durch Wasserstoff in der Chemie und Physik der Seltenerdmetalle. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201108558] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Simon A. Oxidation by Hydrogen in the Chemistry and Physics of the Rare-Earth Metals. Angew Chem Int Ed Engl 2012; 51:4280-6. [DOI: 10.1002/anie.201108558] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2011] [Indexed: 11/10/2022]
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Kienle L, García García F, Duppel V, Simon A. Direct observation of crystallographic and chemical changes during dehydrogenation of oxygen contaminated La2C3H1.5. J SOLID STATE CHEM 2006. [DOI: 10.1016/j.jssc.2005.12.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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