Conveners
Extreme/non-ambient conditions
- Karen Friese (JCNS-2 Forschungszentrum Jülich GmbH)
Extreme/non-ambient conditions
- Ulrich Schwarz (MPI CPfS)
FeOCl features a simple structure built from Fe-O double layers stacked along the c-axis and separated through bi-layers of chlorine; the latter are bonded through weak van der Waals forces. On cooling, an orthorhombic-to-monoclinic lattice distortion occurs at T$_{N}$ = 81 K [1] which removes the geometric frustration of magnetic order of Fe$^{3+}$ moments, as it exists on the orthorhombic...
The pressure-induced solid-state amorphization found in 1985 [1] set off a series of subsequent researches on polyamorphism in SnI${}_4$. The discovery of another amorphous state [2], called Am-II to Am-I previously identified, on decompression became a breakthrough in solving the puzzle.
Later, a consistent thermodynamic argument has been given for the observed polyamorphic behaviors [3]....
This is quite a paradox that a century after introduction of the spherical Independent Atom Model (IAM, 1914 [1]), 99.7% of all ca. 1.5mln known crystal structures, including almost all structures of minerals, have been refined using IAM which suffers from severe methodological deficiencies. Far better results can be obtained when new approaches of quantum crystallography ustilising...
The development of second-generation short-pulse laser-driven radiation sources requires a mature understanding of the relativistic laser-plasma processes such as heating and transport of relativistic electrons as well as the development of plasma instabilities. Accessing these dynamic effects occurring on femtosecond and nanometer scales experimentally is very difficult but it is crucial to...
Scientific advances are often enabled by either new emerging techniques or a previously unconsidered combination of existing methods. Particularly synchrotron X-ray diffraction (XRD) has led to large advances in our understanding of materials under high pressure and temperature conditions. Especially its combination with diamond anvil cells (DAC) has been very fruitful and, therefore, almost...
The study of the behavior of matter at extreme pressure conditions is essential to deepen our understanding of the pressure dependence of interatomic interactions and to benchmark theoretical models. Simple molecular systems at high densities are well known to exhibit a transformation towards polymeric (e.g. N2,[1,2] CO,[3] CO2,[4,5]...
Within the last decade high pressure studies have received significant increase of interest. Present typical applications range from the investigation of high-pressure polymorphism of solid-state organics as part of the pharmaceutical drug development to the study of rocks and minerals with an applied pressure of up to 50 GPa.
A major challenge in the field of high pressure crystallography...
