en
Scientific article
English

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

Published inZeitschrift für anorganische und allgemeine Chemie, vol. 640, no. 15, p. 3184-3189
Publication date2014
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 periodates
  • Irreversible phase transition
  • Metastable compounds
  • Anisotropic diffraction peak broadening
Research group
Citation (ISO format)
KUBEL, Frank et al. Synthesis and Crystal Structures of a Stable, a Metastable and a High Temperature Modification of Pb<sub>2</sub>NaIO<sub>6</sub>. In: Zeitschrift für anorganische und allgemeine Chemie, 2014, vol. 640, n° 15, p. 3184–3189. doi: 10.1002/zaac.201400208
Main files (1)
Article (Published version)
accessLevelRestricted
Identifiers
ISSN of the journal0044-2313
529views
0downloads

Technical informations

Creation12/12/2014 11:57:00 AM
First validation12/12/2014 11:57:00 AM
Update time03/14/2023 10:28:01 PM
Status update03/14/2023 10:28:01 PM
Last indexation01/16/2024 3:15:04 PM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack