
%0 Journal Article
%A Bursill, LA 
%A Peng, JL 
%A Fan, XD 
%T Rhombohedral Twin Structure in Hematite (&#945;-Fe<sub>2</sub>O<sub>3</sub>)
%J Australian Journal of Chemistry
%D 1992/09/01
%V 45
%N 9
%P 1527-1546
%K 
%R https://doi.org/10.1071/CH9921527
%U https://www.publish.csiro.au/paper/CH9921527 
%X Electron optical imaging of the structure of haematite ( &#945;-Fe2O3) in two projections has allowed the microscopic twinning elements of rhombohedral twins to be determined. A systematic analysis of alternative structural models, using computer-simulation and image-matching considerations, as well as crystallochemical arguments, is presented. The twin has a screw operation consisting of a pure rotation of 180º about [0111], the twinning direction, combined with a parallel translation of (1/22) [0111]. The twinning plane (0112) forms a coherent interface, consisting of face-and edge-shared octahedra , with no change in the normal nearest-neighbour coordination. 
