Dimensionality variations in new zirconium iodates: hydrothermal syntheses, structural determination, and characterization of BaZr(IO3)(6) and K2Zr(IO3)(6)
- Authors
- Ahn, Hyun Sun; Lee, Dong Woo; Ok, Kang Min
- Issue Date
- 21-Jul-2014
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- DALTON TRANSACTIONS, v.43, no.27, pp 10456 - 10461
- Pages
- 6
- Journal Title
- DALTON TRANSACTIONS
- Volume
- 43
- Number
- 27
- Start Page
- 10456
- End Page
- 10461
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/13964
- DOI
- 10.1039/c4dt00008k
- ISSN
- 1477-9226
1477-9234
- Abstract
- Two new quaternary zirconium iodates, BaZr(IO3)(6) and K2Zr(IO3)(6), have been synthesized through hydrothermal reactions using BaCO3 (or K2CO3), ZrO2, and HIO3 as reagents. Single crystal and powder X-ray diffraction were used to determine crystal structures of the compounds. BaZr(IO3)(6) exhibits infinite bands that are composed of ZrO7 pentagonal bipyramids and IO3 trigonal pyramids, in which Ba2+ cations are sandwiched by the bands. K2Zr(IO3)(6) exhibits a molecular structure that is composed of ZrO6 octahedra and IO3 groups. The dimensionality variations seem to be attributable to the flexible coordination numbers of Zr4+ cations with large ionic radii as well as the number of counter cations. Both of the materials are thermally stable up to approximately 440-450 degrees C and decompose to the corresponding metal zirconium oxides above these temperatures. The band gaps for BaZr(IO3)(6) and K2Zr(IO3)(6) are calculated to be 3.1 and 3.0 eV, respectively, using the (K/S)-versus-E plots obtained from the UV-vis diffuse reflectance spectra. Infrared spectra and local dipole moment calculations are also presented.
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