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The Laboratory of Condensed Master Structure, headed by R. Przeniosło,
was established in 2009. Most of the
present group members were working (before 2009) in the Laboratory of Structure
and Lattice Dynamics headed by I. Sosnowska (1981-2009). One of the most important achievements
of the early days is the discovery of the modulated magnetic ordering in BiFeO3
described in [I. Sosnowska, T. Peterlin-Neumaier, and E. Steichele, J. Phys. C
15, 4835 (1982)]. This paper has more than 1300 citations ! The team of the Laboratory of Condensed
Matter Structure is using scattering methods to study the structure of
materials with interesting physical properties including: magnetic materials,
ferroelectrics-antiferromagnets and nanocrystaline materials. Our main research methods are
based on neutron scattering and synchrotron radiation. We are using large scale
facilities which provide neutron beams, e.g. High resolution diffraction studies were used to
obtain precise information about the modulated magnetic ordering in
multiferroic compounds. Studies of another multiferroic compound BiFeO3
provided information about the long range magnetic modulation in this material. It was shown that the modulated magnetic ordering does not change its
character in the temperature range from 300 K down to 5 K. Recent high
resolution SR diffraction studies have shown a monoclinic distortion of the
widely accepted rhombohedral BiFeO3
crystal structure. The studies are performed in
collaboration with ILL Grenoble (A. Hewat), ESRF (A.
Fitch) and ISIS, Oxon, Chilton, (A. Daoud-Aladine) The microstructure of nanocrystalline
chromium (nano-Cr) was studied by SR diffraction and
electron microscopy methods. The time dependence of the grain growth
process in annealed nano-Cr was studied by using high
resolution SR diffraction. Fast in-situ measurements provide information
about the changes of the microstructure and also about the oxidation process. These studies were performed in collaboration with the
The temperature changes of the crystal structure of
the mixed oxide CaCu3Ti4O12 showing colossal
dielectric constant were studied by using high resolution SR diffraction. Our
studies have shown some broadening of the X-ray diffraction peaks which may
indicate a phase separation process or some anisotropic broadening. These studies were
performed in collaboration with the |
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© 2012 Section of Condensed Matter Structure, Physics Faculty,
University of Warsaw
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