Microscopic rhombohedral twinning elements of haematite

1 July 1989

journal article
research article
Published by Taylor & Francis in Philosophical Magazine Letters

Vol. 60 (1) , 1-10
https://doi.org/10.1080/09500838908206427

Abstract

Electron optical structure imaging of haematite (α-Fe₂O₃) in two projections has allowed the microscopic twinning elements of rhombohedral twins to be determined. The twin is a pure 180° rotation about [0111], the twinning direction, combined with a parallel translation of ⅙[0111]. The twinning plane (0112) forms a perfectly coherent interface, consisting of face and edge-shared octahedra with no change in nearest-neighbour coordination. A search for alternative structural models yielded none which could reproduce the experimental images.

Keywords

This publication has 2 references indexed in Scilit:

Twinning dislocations in haematite iron ore
Philosophical Magazine A, 1979
Deformation Twinning in Metals and Alloys
International Materials Reviews, 1973