The isothermal section of the Li-Yb-Si system at 470 K has been investigated by X-ray phase analysis. The crystal structures of four ternary compounds formed have been determined.
PL
Za pomocą analizy rentgenowskiej badano izotermiczny przekrój układu Li-Yb-Si w temperaturze 470 K. Określono krystaliczną strukturę czterech utworzonych związków trójskładnikowych.
The single crystals of perfectly quality of the diammonium oxalate monohydrate, [NH4]2[C2O4][H2O], were obtained by the improved methods of crystal growth from solution. The crystal structure of title compound was studied at 150 K using modern X-ray equipment. At this temperature, as well as at room temperature, this compound crystallizes in the orthorhombic symmetry wiith P21212 space group. The unit cell of the title compound is formed by four amonium cations, two oxalate anions and water molecules, with a 2:1:1 cation-anion-water ratio. At 150 K oxalate ion is twisted by 26.9 (1)°. The similar twist angle (26.6 (4)° was observed at the room temperature. Central carbon-carbon bond in oxalate ion is insignificantly longer (1.568 Å) in comparing with this bond at room temperature (1.559 Å).
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