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Title

Synthesis and Crystal Structures of a Stable, a Metastable and a High Temperature Modification of Pb2NaIO6

Authors
Pantazi, Mariana
Wandl, Nicole
Published in Zeitschrift für anorganische und allgemeine Chemie. 2014, vol. 640, no. 15, p. 3184-3189
Abstract In analogy to the synthesis of polycrystalline M2NaIO6 (M = Ca, Sr, Ba) by precipitation in water at 90 °C, the title compound was first prepared as a metastable compound. The stable modification of Pb2NaIO6 was obtained by a heat treatment to 400 °C followed by cooling to room temperature. The crystal structure was refined from powder diffraction data [space group P21/c (14), a = 5.9040(2), b = 5.7526(2), c = 10.1104(3) Å, β = 125.341(1)°]. On heating, at ca. 125 °C, a phase transition to a cubic high temperature modification was observed. The crystal structure was refined from XRD data measured at 200 °C [space group Fm3m (225), a = 8.2678(1) Å]. Depending on the precipitation temperature between 90 °C and 0 °C, several metastable modifications were obtained, which can be distinguished by significantly different lattice parameters. The XRD pattern of a powder precipitated at room temperature is pseudocubic. The crystal structure was refined at room temperature in P21/c with a = 5.8201(4), b = 5.8473(4), c = 10.0798(5) Å, β = 125.074(3)°. This modification behaves almost as a cubic lattice on heating as found from XRD and DSC measurements.
Keywords Lead periodatesIrreversible phase transitionMetastable compoundsAnisotropic diffraction peak broadening
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Other version: http://doi.wiley.com/10.1002/zaac.201400208
Structures
Research group Groupe Hagemann
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KUBEL, Frank et al. Synthesis and Crystal Structures of a Stable, a Metastable and a High Temperature Modification of Pb2NaIO6. In: Zeitschrift für anorganische und allgemeine Chemie, 2014, vol. 640, n° 15, p. 3184-3189. https://archive-ouverte.unige.ch/unige:43538

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Deposited on : 2014-12-16

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