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The Structure of Thorium(IV) Dititanium(IV) Oxide, ThTi206

Tonci Balić Žunić ; Department of Mineralogy and Petrology, Faculty of Science and Mathematics, 41000 Zagreb, Demetrova 1
Stjepan Šćavničar ; Department of Mineralogy and Petrology, Faculty of Science and Mathematics, 41000 Zagreb, Demetrova 1
Zvonimir Grobenski ; AAS Application Laboratory, Bodenseewerk Perkin-Elmer and Co, D-7770 Oberlingen/Bodensee, BRD

Sažetak

The crystal structure of a modification of ThTbOG, obtained
from the melt at 1100 °C, has been analysed by X-ray diffraction
and refined to the R value of 0.051. The crystals are monoclinic
with a= 1.0799(7), b = 0.8570(6), c = 0.5192(3) nm and p = 115.29(3)0
,
space group C2/c, Z = 4, F(OOO) = 728. The structure is based on
a near-hexagonal close-packing of the oxygen atoms, with the
thorium and titanium atoms in »octahedral sites«. The coordination
polyhedron of Th is a distorted square antiprism with Th-0
distances from 0.232 to 0.265 nm, that of Ti a distorted octahedron
with Ti-0 distances from 0.187 to 0.201 nm like those characteristic
for Ti02 polymorphs. The Ti coordination polyhedra form layers
parallel_to the (100) which are connected by zig-zag chains of the
Th coordination polyhedra which run in the [001] direction. The
relations to another ThTi20 6 polymorph structure1 (isomorphous
with brannerite) have been examined.

Ključne riječi

Hrčak ID:

194133

URI

https://hrcak.srce.hr/194133

Datum izdavanja:

20.10.1984.

Posjeta: 902 *