The structure of γ-Bi2Sn2O7 at 725 °C by high-resolution neutron diffraction: implications for bismuth(III)-containing pyrochlores
Abstract
High-resolution neutron powder diffraction has been used to show that
at 725 °C γ-Bi
2
Sn
2
O
7
does not adopt an ideal pyrochlore structure as was previously supposed.
The bismuth(III) ion does not reside at a centre of symmetry
(![[3 with combining macron]](https://www.rsc.org/images/entities/char_0033_0304.gif)
m) but is disordered on a site of lower
symmetry. This results in a distortion of the co-ordination sphere of
the Bi
III
, in accord with the steric activity of the
6s
2
lone pair. These results are compared with those for
other known bismuth(III)-containing pyrochlores.
m) but is disordered on a site of lower
symmetry. This results in a distortion of the co-ordination sphere of
the Bi
III
, in accord with the steric activity of the
6s
2
lone pair. These results are compared with those for
other known bismuth(III)-containing pyrochlores.
Please wait while we load your content...
