ISSN:
0044-2313
Keywords:
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
On Oxotitanates of the Alkaline Metals: On Na4Ti5O12Colourless single crystals of the new titanate Na4Ti5O12 (starting from mixtures Na2O/TiO2, 1000°C, 6 d, Au-crucible, open system) crystallize in the monoclinic system, space group C2/m, a = 26.544(9), b = 2.952(1), c = 6.322(3) Å, β = 95.79(3)°, Z = 2, drö = 3.45 and dpyk = 3.38 g · cm-3 (four-cycle-diffractometer data, PW 1100, 2⊖-scan, MoKα). R = 5.09% and Rw = 4.87% for 1178 independent I0(hkl) with 3° ≤ 2- ≤ 34°. Corrugated layers of Ti5O12, held together by Na+, are stacked along [001]. Details about partially occupied positions of Na+, Effective Coordination Numbers (ECoN), the Madelung part of lattice energy (MAPLE), and the structural differences to Na2Ti3O7 are discussed.
Notes:
Farblose Einkristalle des neuen Titanats Na4Ti5O12 (aus Na2O/TiO2, 1000°C, 6d, Au-Schiffchen, offenes System) kristallisieren monoklin, C2/m, mit a = 26,544(9), b = 2,952(1), c = 6,322(3) Å, β = 95,79(3)°, Z = 2, drö = 3,45 und dpyk = 3,38 g · cm-3 (Vierkreisdiffraktometerdaten, PW 1100, 2⊖-scan, MoKα). Für 1178 symmetrieunabhängige I0(hkl) mit 3° ≤ 2⊖ ≤ 34° ist R = 5,09% und Rw =4,87%. Gewellte Schichten von Ti5O12, durch Na+ zusammengehalten, sind längs [001] gestapelt. Die Fehlordnung eines Teiles von Na+, Effektive Koordinationszahlen (ECoN), der Madelunganteil der Gitterenergie (MAPLE) und die strukturellen Unterschiede zu Na2Ti3O7 werden diskutiert.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19845191212
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