Structural, thermal and vibrational study of superprotonic behavior in a cesium-potassium dihydrogen arsenate: Cs0.5K0.5H2AsO4
| Autor: | K. Jaouadi, Nabil Zouari, Samia Chouchene, Tahar Mhiri |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Chemistry
Hydrogen bond Inorganic chemistry Arsenate chemistry.chemical_element 02 engineering and technology General Chemistry Crystal structure Atmospheric temperature range 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Crystallography chemistry.chemical_compound General Materials Science 0210 nano-technology Spectroscopy Single crystal Arsenic Solid solution |
| Zdroj: | Solid State Ionics. 301:78-85 |
| ISSN: | 0167-2738 |
| Popis: | An investigation of solid solutions of KH 2 AsO 4 –CsH 2 AsO 4 has led to the discovery of a new compound Cs 0.5 K 0.5 H 2 AsO 4 (denoted CKDA). The compound was characterized by X-ray single crystal analysis performed at room temperature and reveal that it crystallizes in the space group I − 42d with the following crystal data: a = 7.6288(6) A, c = 7.1808 (7) A, V = 417.91(6) A 3 and Z = 4. The arsenic atom as well as the potassium and cesium ions lie on points with site symmetry S 4 , the oxygen atoms lie in general positions about the arsenic atoms, in a tetrahedral arrangement. The AsO 4 tetrahedra are connected by O H…O hydrogen bonds laying essentially in the a,b plane. The infrared spectrum at room temperature confirms a structural disorders and the coexistence of the anions H 2 AsO 4 3 − in the crystal structure. A calorimetric study of the title compound shows two distinct endothermal peaks which are detected at 215 and 465 K. Moreover, protonic conduction of the mixed compound determined by impedance and modulus spectroscopy has been studied in the temperature range 180–473 K. |
| Databáze: | OpenAIRE |
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