Berthold Stöger's Research

Research interests

Crystal of (Co,Ni)₂As₂O₇ viewed under a polarizing microscope, featuring systematic twinning

My main research focus is the structural characterization of single crystalline samples that do not follow the definition of classic crystallography (three-dimensional periodicity). Notably:

• Polytypic structures
• Twins
• Incommensurately modulated structures

Current projects that I work on are:

• Polytypism of arsenates and phosphates of alkali metals
• Symmetry-reduction in fluorophosphates
• Superstructures and incommensurate modulation in diarsenates(V), diphosphates(V), divanadates(V) and ditellurates(IV)
• Incommensurate and polytypic structures of organic molecules (in cooperation with the Institute of Applied Synthetic Chemistry)

Moreover, I perform theoretical work on the order-disorder (OD) theory (in cooperation with Erich Zobetz):

• OD structures of layers with different translational groups
• OD structures composed of rod

Practical Courses, Bachelor and Master Theses

In collaboration with Matthias Weil I supervise practical courses, bachelor and master theses at any time. The focus is on growth of single crystals and determination of crystal structures by single crystal diffraction. Moreover, samples are characterized by complementary methods like powder diffraction under non-ambient conditions and thermal analyses.

For more information please use the contact details below.

Single Crystal Structure Service

In cooperation with the X-Ray Centre (XRC) of the Vienna University of Technology, Matthias Weil and myself provide a single crystal diffraction service for small molecules and inorganic compounds. We provide:

• Selection of crystals
• Data collection at temperatures ranging from 90–450 K.
• Structure solution and refinement

• Matthias Weil (+43 1 58801 17122, mweil@mail.tuwien.ac.at)
• Berthold Stöger (+43 1 58801 17123, bstoeger@mail.tuwien.ac.at)

Contact

Berthold Stöger
Getreidemarkt 9/164-SC
1060 Wien
Austria

E-Mail: bstoeger@mail.tuwien.ac.at
Tel.: +43 (1) 58801 - 17123
Fax.: +43 (1) 58801 - 17199

Publications

For a (more or less complete) list of my publications, click here. A selected list of publications on the above topics:

• D. Lumpi, P. Kautny, B. Stöger, J. Fröhlich: Crystal chemistry of layered structures formed by linear rigid silyl-capped molecules, IUCrJ 2 (2015), 584–600
• B. Stöger, C. Holzhacker, K. Kirchner: [Fe(PNN-iPr)Br₂]·xDCM: the first example of merotype-epitaxy of a molecular structure and its solvatomorph, Zeitschrift für Kristallographie 230 (2015), 621–628
• B. Bichler, C. Holzhacker, M. Glatz, B. Stöger, K. Kirchner: The twinning of three Fe-PNP pincer complexes interpreted according to order-disorder (OD) theory, Acta Crystallographica B71 (2015), 524–534
• B. Stöger: Non-crystallographic layer lattice restrictions in order-disorder (OD) structures, Symmetry 6 (2014), 589–621 (Open access)
• B. Stöger, M. Dušek: Complex polymorphism and polytypism of potassium metaarsenate, KAsO₃, Crystal Growth & Design 14 (2014), 4640–4657
• B. Stöger, P. Kautny, D. Lumpi, E. Zobetz, J. Fröhlich: The pseudo-inversion symmetry of 9,9'-(1,3,4-oxadiazole-2,5,-diyldi(1,1'-biphenyl)-2',4-diyl)bis[9H-carbazole] in the light of OD theory, Zeitschrift für Kristallographie 229 (2014), 378–384
• B. Stöger, P. Kautny, D. Lumpi, E. Zobetz, J. Fröhlich: Solvatomorphism of 9,9'-[1,3,4-thiadiazole-2,5-diylbis(2,3-thiophendiyl-4,1-phenylene)]bis[9H-carbazole]: isostructurality, modularity and order-disorder theory, Acta Crystallographica B68 (2012), 667–676
• B. Stöger, D. Lumpi, J. Fröhlich: 4-[(Z)-2-(Methylsulfanyl)ethenyl]-1-phenyl-1H-1,2,3-trizole: an order-disorder (OD) interpretation of twinning, Acta Crystallographica C67 (2011), 464–468
• B. Stöger, B. Pokorny, D. Lumpi, J. Fröhlich: The twinning of two closely related phenylisoxazoles interpreted according to order-disorder theory, Zeitschrift für Kristallographie 228 (2013), 106–112
• B. Stöger, M. Weil: The calcium oxotellurate(IV) nitrates Ca₅Te₄O₁₂(NO₃)₂(H₂O)₂ and Ca₆Te₅O₁₅(NO₃)₂, Mineralogy and Petrology 107 (2013), 253–263
• B. Stöger, M. Weil, M. Dušek: The α↔β phase transitions of Zn₂P₂O₇ revisited: existence of an additional intermediate phase with an incommensurately modulated structure, Acta Crystallographica B70 (2014), 539–554
• B. Stöger, M. Weil, J. Skibsted: The crystal structure of BaPO₃F revisited - a combined X-ray diffraction and solid-state ¹⁹F, ³¹P MAS NMR study, Dalton Transactions 42 (2013), 11672–11682
• B. Stöger, M. Weil, E. Zobetz: The 2.5- and 6-hydrates of dipotassium hydrogen arsenate, K₂HAsO₄: complex hydrogen bonding networks, one with an "ambiguous" order-disorder structure, Zeitschrift für Kristallographie 227 (2012), 859–868
• B. Stöger, M. Weil, E. Zobetz, G. Giester: Polymorphism of CaTeO₃ and solid solutions Ca_xSr_1-xTeO₃, Acta Crystallographica B65 (2009), 167–181
• M. Weil, B. Stöger: Crystal chemistry of transition metal diarsenates M₂As₂O₇ (M=Mn, Co, Ni, Zn): variants of the thortveitite structure, Acta Crystallographica B66 (2010), 603–614

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