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]) - Research portal of Justus Liebig University Giessen:

Journal article

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])

Authors list: MADER, K; HOPPE, R

Publication year: 1994

Pages: 225-233

Journal: Journal of Inorganic and General Chemistry

Volume number: 620

Issue number: 2

ISSN: 0044-2313

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

Publisher: 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.

Citation Styles

Harvard Citation style: 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 Citation style: 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

Keywords

[IRO4]4- GROUPS; MAGNETIC MEASUREMENTS; MAPLE CALCULATION; OXOIRIDATES