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Volume 8, Issue 2 (Suppl)
Chem Sci J 2017
ISSN: 2150-3494 CSJ, an open access journal
Euro Chemistry 2017
May 11-13, 2017
May 11-13, 2017 Barcelona, Spain
4
th
European Chemistry Congress
Oxide materials chemistry using single crystal and powder X-ray and neutron diffraction
Tilo Sohnel
University of Auckland, New Zealand
M
ixed transition-metal oxides (MTMO) including stannate phases have promising material properties and are known for the
ability to tailor particular features for different uses. They are currently being explored as possible alternative substrates in many
emerging high-tech applications such as electrode materials in lithium-ion batteries and as conducting oxides in gas detector sensors
[1-3]. The presentation will an overview about the preparation, crystallographic and characterization based on X-ray and neutron
diffraction techniques of two groups of mixed transitionmetal-main groupmetal oxide materials and spinel compound. Layered oxide
structures have been widely studied for their potential use in applications ranging from ferroelectricity to giant magnetoresistance in
the field of semiconductor materials. The Fe based layered oxide Fe
4-x
Mn
x
Si
2
Sn
7
O
16
provides a novel situation in oxide compounds. It
can be described as a composite of intermetallic (FeSn
6
) clusters and (Fe/MnO
6
)/(SnO
6
) oxide layers within the one structure. SiO
4
tetrahedra separate these layers which leads to electronic and magnetic isolation of the repeated layers by about 7 Å resulting in a
nearly perfectly 2D oxide system comparable to a one layer thick oxide “thin film”. In this study, starting with Fe
4
Si
2
Sn
7
O
16
, we focus
on analysing the electronic structure and its relationship to unique magnetic properties [4-5]. The presentation also summarizes the
crystal and magnetic structures of novel iron and tin containing quaternary spinel structures (
M
2-x
Fex)SnO
4
(
M
= Mn, Zn and 0 ≤ x
≤ 2). Neutron and synchrotron X-ray powder diffraction in combination with spectroscopic investigations (Mössbauer, IR and UV-
Vis), magnetic measurements and SEM/EDX have been performed on the (
M
2-x
Fex)SnO
4
systems to find out the exact mechanism
of Fe substitution, how much Fe and in what oxidation state is substituted and the effects upon the crystal and magnetic structure.
Biography
Tilo Söhnel did his PhD at the Technical University of Dresden, Germany, in the field of inorganic solid-state chemistry. After different post-doctoral positions
in Germany and Auckland, he started as lecturer at the University of Auckland and is currently Associate Professor. His research interest lies in the field of
experimental and theoretical chemistry of solid state compounds and inorganic materials such as mixed main group metal / transition metal cluster compounds
and complex transition metal oxides. This includes the preparation and characterization of novel tin and antimony cluster compounds with promising materials
properties and the calculation of band structures of solid-state compounds to investigate the crystal structure and the electronic structure. For the identification of
these compounds the group intensively uses X-ray and neutron single crystal and powder diffraction techniques.
t.soehnel@auckland.ac.nzTilo Sohnel, Chem Sci J 2017, 8:2(Suppl)
http://dx.doi.org/10.4172/2150-3494-C1-008