Nuclear structures: Twinning and modulation in crystals

0510560 - FZÚ 2020 RIV FR eng C - Konferenční příspěvek (zahraniční konf.)
Petříček, Václav - Dušek, Michal
Nuclear structures: Twinning and modulation in crystals.
EPJ Web of Conferences. Vol. 155. Les Ulis: EDP Sciences, 2017 - (Kiat, J.; Janolin, P.; Gillion, B.; Porcher, F.; Fernandez Diaz, M.), s. 1-16, č. článku 00003. ISBN 978-2-7598-9025-5. ISSN 2100-014X.
[International Thematic School on Crystallography and Neutrons (JDN 22). Oleron (FR), 21.09.2014-24.09.2014]
Institucionální podpora: RVO:68378271
Klíčová slova: crystal structure * difficult structures * twinned structures * modulated structures
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)

Crystal structure analysis is a standard technique routinely applied to single crystals as well as powders. However the process is not so straightforward if the crystal sample is affected by twinning or if the structure is modulated. In such cases the standard procedures are not directly applicable. The main purpose of this contribution is to show how to solve and refine such difficult structures. While for twinned structures the basic property of crystal – translation symmetry in three dimensional space–remains valid, for modulated crystals a special superspace theory must be exploited in or der to describe the atomic structure with crystallographic methods generalized for superspace.
Trvalý link: http://hdl.handle.net/11104/0301009