Journal article

Publication year: 1993

Pages: 1647-1654

Journal: Journal of Inorganic and General Chemistry

Volume number: 619

Issue number: 10

ISSN: 0044-2313

DOI Link: https://doi.org/10.1002/zaac.19936191002

Publisher: Wiley

Abstract: 

For the first time we prepared transparent red single crystals of Na4[IrO4] by an ''exchange reaction'' (Li2IrO3 + 2.20 Na2O; Ag, 800-degrees-C, 71 days): tetragonal, space group I4/m (No. 87), a = 716.70(4) pm and c = 471.32(4) pm; Z = 2.

The structure determination via four circle diffractometer data (Mo-KalphaBAR, graphite; 2138 I0(hkl), R = 0.0179; R(w) = 0.0184) was carried out with all 296 independent reflexions.

Therefore Na4IrO4 crystallizes in a defect-variant of MgO which can be derived from Na4UO5. Ir4+ is surrounded square-like by four O2- with two vacancies L completing the octahedron.

The Madelung Part of Lattice Energy, MAPLE, Effective Coordination Numbers, ECoN, these via Mean Fictive Ionic Radii, MEFIR, are calculated and discussed. Furthermore the mean value for MAPLE(''IrO2'') of all alkaline- and alkaline-earth-oxoiridates(IV) is given.

Harvard Citation style: MADER, K. and HOPPE, R. (1993) ON OXOIRIDATES(IV) WITH SQUARE-PLANAR GROUPS [IRO4]4- - NA4IRO4, A SUBSTITUTION-VARIANT OF MGO WITH ORDERED VACANCIES IN THE ANIONIC PART OF STRUCTURE, Zeitschrift für anorganische und allgemeine Chemie = Journal of Inorganic and General Chemistry, 619(10), pp. 1647-1654. https://doi.org/10.1002/zaac.19936191002

APA Citation style: MADER, K., & HOPPE, R. (1993). ON OXOIRIDATES(IV) WITH SQUARE-PLANAR GROUPS [IRO4]4- - NA4IRO4, A SUBSTITUTION-VARIANT OF MGO WITH ORDERED VACANCIES IN THE ANIONIC PART OF STRUCTURE. Zeitschrift für anorganische und allgemeine Chemie = Journal of Inorganic and General Chemistry. 619(10), 1647-1654. https://doi.org/10.1002/zaac.19936191002