Journal article

Publication year: 1994

Pages: 882-887

Journal: Journal of Inorganic and General Chemistry

Volume number: 620

Issue number: 5

ISSN: 0044-2313

DOI Link: https://doi.org/10.1002/zaac.19946200522

Publisher: Wiley

Abstract: 

Colourless single crystals of K6[Al2O6] have been prepared from intimate mixtures of KAlO2 and K2O (550-degrees-C, 90 d). The structure determination from four-circle diffractometer data (MoKalphaBAR, 742 I(o)(hkl), R = 2.2%, R(w) = 2.1%) confirms the space group C2/m with Z = 2; a = 698.25 pm, b = 1 103.54 pm, c = 646.49 pm, beta = 102.49-degrees.

Colourless single crystals of hitherto unknown Rb6[Al2O6] have been prepared from intimate mixtures of RbAlO2 and Rb2O (520-degrees-C, 120 d). The structure determination from four-circle diffractometer data (MoKalphaBAR, 1240 I(o)(hkl)) results in the residual values R = 7.2%, R(w) = 4.9%; space group C2/m; a = 725.92 pm, b = 1143.33 pm, c = 678.06 pm, beta = 104.05-degrees; Z = 2.

K6[Al2O6] and Rb6[Al2O6] are isostructural with K6[Fe2O6]. A characteristic structure unit is the anion [Al2O6]6- consisting of two edge-sharing [AlO4] tetrahedra.

Effective Coordination Numbers (ECoN), Mean Fictive Ionic Radii (MEFIR), the Madelung Part of Lattice Energy (MAPLE) and the Charge Distribution (CHARDI) are calculated and discussed.

Harvard Citation style: SCHLAGER, M. and HOPPE, R. (1994) PREPARATION AND CRYSTAL-STRUCTURE OF K6[AL2O6] AND RB6[AL2O6], Zeitschrift für anorganische und allgemeine Chemie = Journal of Inorganic and General Chemistry, 620(5), pp. 882-887. https://doi.org/10.1002/zaac.19946200522

APA Citation style: SCHLAGER, M., & HOPPE, R. (1994). PREPARATION AND CRYSTAL-STRUCTURE OF K6[AL2O6] AND RB6[AL2O6]. Zeitschrift für anorganische und allgemeine Chemie = Journal of Inorganic and General Chemistry. 620(5), 882-887. https://doi.org/10.1002/zaac.19946200522