Structural insights into the thermal decomposition sequence of barium tetrahydrogenorthotellurate(VI), Ba[H₄TeO₆]

Autor(en)

Matthias Weil, Berthold Stöger, Christian Gierl-Mayer, Eugen Libowitzky

Abstrakt

The compounds Ba[H4TeO6] (I), Ba[H2TeO5] (II), Ba[Te2O6(OH)2] (III) and Ba[TeO4] (IV) were prepared by application of a diffusion method (I), under hydrothermal conditions (II and III) and from solid state reactions (IV), respectively. Structure analysis on the basis of single crystal X-ray diffraction data revealed novel structure types for (I), (II) and (III) and isotypism of (IV) with PrSbO4 and LaSbO4. Common feature of the four oxotellurate(VI) structures are [TeO6] octahedra. Whereas in the crystal structure of (I) the octahedral units are isolated, they are condensed into chains via corner-sharing in (II) and via edge-sharing in (III) and (IV). The coordination numbers of the barium cations in the four structures range from seven to ten. Although hydrogen atom positions could not be located for the structures of (I) and (II), short interpolyhedral O···O contacts are evident for strong hydrogen bonding. The temperature behaviour of (I), (II) and (IV) was monitored by simultaneous thermal analysis (STA) measurements and in situ powder X-ray diffraction, revealing the decomposition sequence Ba[H4TeO6] -> Ba[H2TeO5] -> Ba[TeO4] -> Ba[TeO3] upon heating to temperatures up to 900 °C.

Organisation(en)

Institut für Mineralogie und Kristallographie

Externe Organisation(en)

Technische Universität Wien

Journal

Journal of Solid State Chemistry

Band

241

Seiten

187-197

Anzahl der Seiten

11

ISSN

0022-4596

DOI

https://doi.org/10.1016/j.jssc.2016.06.010

Publikationsdatum

06-2016

Peer-reviewed

Ja

ÖFOS 2012

104011 Materialchemie, 105113 Kristallographie

Schlagwörter

ASJC Scopus Sachgebiete

Electronic, Optical and Magnetic Materials, Condensed Matter Physics, Ceramics and Composites, Materials Chemistry, Inorganic Chemistry, Physical and Theoretical Chemistry

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/887b31a3-0085-4efc-8950-64614fb7ba2b