Bärnighausen Trees – A group–subgroup reference database
Theresa Block, Stefan Seidel, Rainer Pöttgen
Abstract
Abstract Group–subgroup schemes are a useful tool in crystal chemistry for systemizing crystal structures and they are an indispensable help during X-ray crystallographic studies of complex, twinned and modulated structures. Meanwhile many superstructure variants are summarized within so-called Bärnighausen trees. The present database lists relevant literature with respect to the crystallographic/group-theoretical tools and original work and gives a tabulated overview on the crystallographic fingerprints (aristotype, space group symbol, Pearson code and Wyckoff sequence) of the respective superstructures.
Topics & Concepts
Group (periodic table)SuperstructureCrystallographyCrystal structureSequence (biology)Space groupCombinatoricsSpace (punctuation)MathematicsComputer scienceChemistryPhysicsX-ray crystallographyDiffractionOperating systemBiochemistryThermodynamicsOrganic chemistryOpticsX-ray Diffraction in CrystallographyCrystal Structures and PropertiesInorganic Fluorides and Related Compounds