Structure transformations in nickel oxalate dihydrate NiC2O4·2H2O and nickel formate dihydrate Ni(HCO2)2·2H2O during thermal decomposition
| Autor: | Pavel V. Mateychenko, Anna N. Puzan, Vyacheslav N. Baumer, Dmytro Lisovytskiy |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
chemistry.chemical_element 02 engineering and technology Crystal structure Nickel formate dihydrate 010402 general chemistry 01 natural sciences Oxalate Inorganic Chemistry chemistry.chemical_compound Materials Chemistry medicine Dehydration Physical and Theoretical Chemistry Thermal decomposition Non-blocking I/O 021001 nanoscience & nanotechnology Condensed Matter Physics medicine.disease 0104 chemical sciences Electronic Optical and Magnetic Materials Nickel Crystallography chemistry Ceramics and Composites 0210 nano-technology Powder diffraction |
| Zdroj: | Journal of Solid State Chemistry. 266:133-142 |
| ISSN: | 0022-4596 |
| Popis: | Structure and thermolysis of NiC2O4·2H2O (I) and Ni(HCO2)2·2H2O (II) were studied for the precipitated powders from the water solutions of precursors. The compound (I) has a disordered structure (C2/c, a=11.7916(5), b= 5.31798(14), c= 9.7806(7) A, β = 127.014(6)°, V= 489.73(4)A3) which is described via the displacement vector applied to the basis atoms and the part of the shifted atoms. Thermal dehydration of (I) leads to formation of the disordered β-NiC2O4 (III), the structure of which (P21/n, a=5.8294(9), b= 5.1685(13), c= 5.2712(4) A, β = 117.793(12)°, V= 140.50(5)A3) was refined from the powder diffraction. Oxalates (I) and (III) are both characterized by the essential part of the shifted atoms causing the extinction of some lines in XRPD pattern. The final product of thermal decomposition of (I) in air is NiO, whereas thermolysis of (II) leads to formation of Ni/NiO mixture. The content of Ni in the latter depends on the thickness of the decaying layer in the sample because the gaseous products of the reaction prevent the oxidation of the nickel formed initially. |
| Databáze: | OpenAIRE |
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