Journal article

Publication year: 1992

Pages: 38-46

Journal: Journal of Inorganic and General Chemistry

Volume number: 614

Issue number: 8

ISSN: 0044-2313

DOI Link: https://doi.org/10.1002/zaac.19926140809

Publisher: Wiley

Abstract: 

Colourless, transparent single crystals of Na5TaO5 [annealed mixtures of Na2O, Li2O, and Ta2O5, Na:Li:Ta = 6.6:1.1:1, Ni-cylinder, 1000-degrees-C, 75 d] as well as Na5NbO5 [annealed mixtures of Na2O, Li2O, and Nb2O5, Na:Li:Nb = 6.6:1.1:1, Ni-cylinder, 1000-degrees-C, 75 d] have been prepared. Single crystal data show that both isotypic oxides represent a deformed variant of the NaCl-type of structure [Na5TaO5: 1154 from 1250 I(o)(hkl), four-cycle diffractometer Philips PW 1100, omega-2-theta scan, Ag-K-alphaBAR, R = 4.88%, space group C2/c with a = 629.3(1) pm, b = 1025.4(2) pm, c = 1004.6(2) pm, beta-106.80(2)-degrees, Z = 4 and Na5NbO5: 998 from 1247 I(o)(hkl), four-cycle diffractometer Philips PW 1100, omega-2-theta scan, Ag-K-alphaBAR, R = 8.58% and R(W) = 7.67%, space group C2/c with a = 629.1(1) pm, b = 1024.4(2) pm, c = 1004.2(2) pm, beta = 106.80(2)-degrees, Z = 4].

The Madelung Part of Lattice Energy, MAPLE, and Effective Coordination Numbers, ECoN, the latter derived from Mean Effective Fictive Ionic Radii, MEFIR, as well as Charge Distribution, CHARDI, are calculated.

Harvard Citation style: HOPPE, R. and WEHRUM, G. (1992) ON TANTALATES AND NIOBATES RICH IN CATIONS - ON NA5TAO5 AND NA5NBO5, Zeitschrift für anorganische und allgemeine Chemie = Journal of Inorganic and General Chemistry, 614(8), pp. 38-46. https://doi.org/10.1002/zaac.19926140809

APA Citation style: HOPPE, R., & WEHRUM, G. (1992). ON TANTALATES AND NIOBATES RICH IN CATIONS - ON NA5TAO5 AND NA5NBO5. Zeitschrift für anorganische und allgemeine Chemie = Journal of Inorganic and General Chemistry. 614(8), 38-46. https://doi.org/10.1002/zaac.19926140809