Koenigstein, Markus (1999) Structural properties of nonstoichiometric barium and strontium peroxides: BaO2-x(1.97 >= 2-x >= 1.72) and SrO2-x(1.98 >= 2-x >= 1.90). JOURNAL OF SOLID STATE CHEMISTRY, 147 (2). pp. 478-484. ISSN 0022-4596, 1095-726X
Full text not available from this repository.Abstract
The crystal structures of eight single crystals of barium and strontium peroxide, prepared by high pressure-high temperature synthesis, were determined by X-ray diffraction. The crystallographic data were successfully refined in the calcium carbide structure (space group 14/mmm, Z=2). The results clearly indicate that the peroxides are nonstoichiometric compounds, MO2-x (M=Ba, Sr), with a peroxide deficiency and that oxide ions are present on interstitial lattice sites. The composition rage extends from near stoichiometry to compounds with a total oxygen content of 1.72 in the barium and 1.90 in the strontium peroxide. We find that the oxide ions, replacing the peroxide molecular ions, occupy an interstitial position that is in the middle of the replaced peroxide molecular ion. A decrease of the peroxide content in the crystals results in a decreased c-axis of the tetragonal unit cell of the structure, while the a-axis is almost constant. Furthermore, the peroxide bond length decreases, as was confirmed by Raman spectroscopy. (C) 1999 Academic Press.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CRYSTAL; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 13 Dec 2022 09:26 |
| Last Modified: | 13 Dec 2022 09:26 |
| URI: | https://pred.uni-regensburg.de/id/eprint/48888 |
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