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The Periodate-Based Double Perovskites M2NaIO6 (M = Ca, Sr, and Ba)

Wandl, Nicole
Pantazi, Mariana
Published in Zeitschrift für anorganische und allgemeine Chemie. 2013, vol. 639, no. 6, p. 892-898
Abstract The crystal structures of the M2NaIO6 series (M = Ca, Sr, Ba), prepared at 650 °C by ceramic methods, were determined from conventional laboratory X-ray powder diffraction data. Synthesis and crystal growth were made by oxidizing I– with O2(air) to I7+ followed by crystal growth in the presence of NaF as mineralizator, or by the reaction of the alkali-metal periodate with the alkaline-earth metal hydroxide. All three compounds are insoluble and stable in water. The barium compound crystallizes in the cubic space group Fm3m (no. 225) with lattice parameters of a = 8.3384(1) Å, whereas the strontium and calcium compounds crystallize in the monoclinic space group P21/c (no. 14) with a = 5.7600(1) Å, b = 5.7759(1) Å, c = 9.9742(1) Å, β = 125.362(1)° and a = 5.5376(1) Å, b = 5.7911(1) Å, c = 9.6055(1) Å, β = 124.300(1)°, respectively. The crystal structure consists of either symmetric (for Ba) or distorted (for Sr and Ca) perovskite superstructures. Ba2NaIO6 contains the first perfectly octahedral [IO6]5– unit reported. The compounds of the ortho-periodates are stable up to 800 °C. Spectroscopic measurements as well as DFT calculations show a reasonable agreement between calculated and observed IR- and Raman-active vibrations.
Keywords BariumStrontiumCalciumSodium ortho-periodatesChemical stabilityRaman spectroscopyDFT calculations
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Research group Groupe Hagemann
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KUBEL, Frank et al. The Periodate-Based Double Perovskites M2NaIO6 (M = Ca, Sr, and Ba). In: Zeitschrift für anorganische und allgemeine Chemie, 2013, vol. 639, n° 6, p. 892-898. https://archive-ouverte.unige.ch/unige:28397

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Deposited on : 2013-06-05

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