Publications in Scientific Journals:
M. Rotter, B. Stöger:
"RbSbO3: A Simple Structure with Complex Polytypism";
Crystal Research and Technology (invited),
55
(2020),
5;
1900164-1
- 1900164-11.
English abstract:
RbSbO3 crystallizes in different polytypes composed of trigonal [SbO3]− and [Rb]+ layers, which can appear in two orientations with respect to m<100> and m<120>, respectively. The order-disorder (OD) polytype family comprises four polytypes of a maximum degree of order (MDO), of which two are realized in actual crystals: MDO1 (R-3, c ≈ 19.8 Å, isotypic to ilmenite-like KSbO3) and MDO2 (R-3c, c ≈ 39.2 Å, isotypic to AgRuO3 ). Crystals grown from RbF:Sb2O5 in a 2:1 ratio are MDO1:MDO2 allotwins, whereas crystals grown from a 12:1 mixture are composed of MDO2 only. The stacking ambiguity leads to twinning by rotation about <100> or <120>. KSbO3 crystals grown from KF:Sb2O5 are composed of the MDO1 polytype only. The crystals are fourfold twins owing to stacking faults. A detailed description of the analysis of the diffraction data is given.
Keywords:
allotwinning; order-disorder theory; partial symmetry; polytypism
"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)
http://dx.doi.org/10.1002/crat.201900164
Created from the Publication Database of the Vienna University of Technology.