Journalartikel

Jahr der Veröffentlichung: 1994

Seiten: 659-664

Zeitschrift: Journal of Inorganic and General Chemistry

Bandnummer: 620

Heftnummer: 4

ISSN: 0044-2313

DOI Link: https://doi.org/10.1002/zaac.19946200414

Verlag: Wiley

Abstract: 

For the first time, colourless single crystals of Li7[TaO6] were grown by annealing intimate mixtures of Li2O and Ta2O5 (Li: Ta = 7,7: 1) in closed Ni-cylinders (1000-degrees-C, 156 d). [Trigonal-rhomboedral with a = 535.8(1) pm, c = 1507.3(3) pm, c/a = 2.81/Guinier-Simon-powder data; Z = 3. Space group R3BAR for the part Li(1)6TaO6 and presumably P3 for Li7TaO6, including Li(2)].

The crystal structure was solved by four-cycle-diffractometer data [Mo-KalphaBAR, 331 from 331 I(o)(hkl), R = 1.99%, R(w) = 1.96%], parameters see text.

The positions of anions correspond to the motif of a hexagonal closest packing of spheres, obviously deformed (with ME-FIR of O2- space filling corresponds to 69.8% instead of expected 73.2%. 1/3 of the octahedron holes are ordered occupied by Ta and Li(2), 1/2 of the tetrahedral holes likewise ordered by Li(1). All polyhedra of coordination of the anions are trigonal prisms.

The Madelung Part of Lattice Energy, MAPLE, and Effective Coordination Numbers, ECoN, these calculated via Mean Fictive Ionic Radii, as well as charge distribution 'CHARDI' are calculated and discussed.

Harvard-Zitierstil: WEHRUM, G. and HOPPE, R. (1994) ON TANTALATES RICH IN CATIONS ON LI7[TAO6], Zeitschrift für anorganische und allgemeine Chemie = Journal of Inorganic and General Chemistry, 620(4), pp. 659-664. https://doi.org/10.1002/zaac.19946200414

APA-Zitierstil: WEHRUM, G., & HOPPE, R. (1994). ON TANTALATES RICH IN CATIONS ON LI7[TAO6]. Zeitschrift für anorganische und allgemeine Chemie = Journal of Inorganic and General Chemistry. 620(4), 659-664. https://doi.org/10.1002/zaac.19946200414