Journalartikel

Jahr der Veröffentlichung: 1994

Seiten: 225-233

Zeitschrift: Journal of Inorganic and General Chemistry

Bandnummer: 620

Heftnummer: 2

ISSN: 0044-2313

DOI Link: https://doi.org/10.1002/zaac.19946200206

Verlag: Wiley

Abstract: 

For the first time magnificent dark red cuboid single crystals of K2Na2[IrO4] were prepared by annealing intimate mixtures of a) KO0.51, Na2O2, IrO2 and Ir-powder (molar proportions 3.02:1.40:1.00:1.00; Ag-bomb, 740-degrees-C, 54 d) and of b) KO0.51, Na2O and IrO2 (molar proportions K: Na: Ir = 2.20:2.20:1.00; Ag-bomb, 760-degrees-C, 57 d) respectively. The oxide crystallizes mP36, space group P2(1)/c with a = 600.35(6) pm, b = 1111.2(1) pm, c = 933.0(1) pm and beta = 113.14(1)-degrees.

Structure determination via four-circle diffractometer data (Siemens AED 2, Mo-Kalpha-Radiation) for all 2347 unique reflexions (merged from 9397 I(o)(hkl)) gave R = 0.0357 and R(w) = 0.0340. K2Na2[IrO4] crystallizes in a new type of structure. The oxide is antiferromagnetic as magnetic measurements showed (T(N) = 32 K, THETA = -60.2 K (single crystals) and -49.2 K (powder) respectively, mu = 3.06 mu(B) (single crystals) and 2.93 mu(B) (powder) respectively).

Effective coordination numbers ECoN, mean fictive ionic radii MEFIR and the Madelung part lattice energy MAPLE as well as the charge distributions CHARDI and CHARDINO are calculated and discussed.

Harvard-Zitierstil: MADER, K. and HOPPE, R. (1994) A NEW-TYPE OF STRUCTURE IN OXOIRIDATES WITH SQUARE-PLANAR GROUPS [IRO4]4- - K2NA2[IRO4], A NETWORK 3-INFINITY[NA2IRO4] WITH CHANNELS - (WITH A REMARK ON RB2NA2[IRO4]), Zeitschrift für anorganische und allgemeine Chemie = Journal of Inorganic and General Chemistry, 620(2), pp. 225-233. https://doi.org/10.1002/zaac.19946200206

APA-Zitierstil: MADER, K., & HOPPE, R. (1994). A NEW-TYPE OF STRUCTURE IN OXOIRIDATES WITH SQUARE-PLANAR GROUPS [IRO4]4- - K2NA2[IRO4], A NETWORK 3-INFINITY[NA2IRO4] WITH CHANNELS - (WITH A REMARK ON RB2NA2[IRO4]). Zeitschrift für anorganische und allgemeine Chemie = Journal of Inorganic and General Chemistry. 620(2), 225-233. https://doi.org/10.1002/zaac.19946200206