Conference Agenda

Session
MS-86: Modular structure of inorganic and mineral compounds
Time:
Friday, 20/Aug/2021:
2:45pm - 5:10pm

Session Chair: Isabella Pignatelli
Session Chair: Berthold Stöger
 Location: Club D

50 1st floor

Invited: Olivier Perez (France), Marie Colmont (France)


Session Abstract

Modular structures are built of distinct layers, rods or blocks, which can be arranged in different ways. They are ubiquitously found in the realms of synthetic inorganic chemistry as well as mineral compounds and lead to challenging crystallographic problems, such a twinning, allotwinning or diffuse
scattering owing to disorder. Moreover, recognition of the modular character of a structure allows for a classification into structure families. The symmetry description of modular structures, as well as their modelling using for example the superspace approach is an active area of research.


Introduction
Presentations
2:45pm - 2:50pm

Introduction to session

Isabella Pignatelli, Berthold Stöger


2:50pm - 3:20pm

Designing Composite Spin Chain Structures Built up of Dimeric and Trimeric Polyhedral Units: The oxides A1+y[(Mn1-xCox)1-z◊z]O3 (A=Ca, Sr; x = 3/8).

Olivier Perez1, Vincent Caignaert1, Bernard Raveau1, Vincent Hardy Hardy1, Nahed Sakly1, MD Motin Seikh2

1CRISMAT, CNRS-ENSICAEN,6 Bd du Maréchal Juin, 14050 Caen Cedex, France; 2Department of Chemistry, Visva-Bharati University, Santiniketan 731235, West Bengal, India

External Resource: https://www.xray.cz/iucrv/vidp.asp?id=587

3:20pm - 3:50pm

Diffraction enhancement of symmetry and modular structures

Akihiro UMAYAHARA1,2, Bernd Souvignier1, Massimo Nespolo2

1Radboud University, Faculty of Science, Mathematics and Computing Science, Institute for Mathematics, Astrophysics and Particle Physics. Postbus 9010, 6500 GL Nijmegen, The Netherlands.; 2Université de Lorraine, Vandoeuvre lès Nancy, France

External Resource: https://www.xray.cz/iucrv/vidp.asp?id=588

3:50pm - 4:15pm

Polytypism in cronstedtite; how various stacking sequences of layers affect diffraction pattern

Jiří Hybler

Institute of Physics of the Czech Academy of Sciences, Prague 8, Czech Republic

External Resource: https://www.xray.cz/iucrv/vidp.asp?id=589

4:15pm - 4:40pm

Binary beryllium pnictides: ordered and disordered coloring variants of the diamond structure

Alexander Feige, Marvin Michak, Maxim Grauer, Daniel Günther, Lennart Staab, Christopher Benndorf, Oliver Oeckler

Leipzig University, Faculty of Chemistry and Mineralogy, Leipzig, Germany

External Resource: https://www.xray.cz/iucrv/vidp.asp?id=590