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38
K. Kovnir et al. / Journal of Solid State Chemistry 182 (2009) 630–639
ELF isosurfaces at different levels shows that lone pair isosurfaces
are surrounded by the isosurfaces of other lone pairs or 4c
interaction and most likely cannot come close to other atoms so
that the multicenter interaction is impossible. Such isolated lone
pairs were already reported for several solid stannides of alkali-
and alkali-earth metals [31,32]. It was proposed that repulsive
lone pair interactions can lead to the phenomenon of super-
conductivity in intermetallic compounds [32]. Indeed, super-
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Conclusions
4 3
We have demonstrated that Sn As can be produced by
[
[
solvothermal reaction starting form such simple reagents as
metallic tin and elemental arsenic. Presence of ammonia chloride
was necessary to get high yields of the reaction. The crystal
structure of the title tin arsenide was re-determined and absence
of the inversion center was clearly demonstrated by single crystal
X-ray analysis. No evidences for either vacancy presence or mixed
occupancy of atomic positions were deduced. Detailed analysis of
4
.7, Max-Planck-Institut f u¨ r Festk o¨ rperforschung, Stuttgart, 1999.
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Yu.V.K. thanks JSPS Postdoctoral Fellowships for Foreign
Researchers. A.V.So. and A.V.Sh. acknowledge the support of the
Russian Foundation for Basic Research.
[
5
8
786–8793;
Appendix A. Supplementary data
[b] J.V. Zaikina, K.A. Kovnir, A.V. Sobolev, I.A. Presniakov, Yu. Prots, M.
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Supplementary data associated with this article can be found
in the online version at 10.1016/j.jssc.2008.12.007.
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