Twin model for orthorhombic perovskites

Bas B. Van Aken; Auke Meetsma; Thomas T. M. Palstra

paper

Twin model for orthorhombic perovskites

arXiv:cond-mat/0103628

Abstract

We present a detailed single crystal x-ray diffraction study of twinned orthorhombic perovskites. The diffraction pattern can be indexed on a $2 a_{p}$ x $2 a_{p}$ x $2 a_{p}$ lattice, but does not obey cubic symmetry relations. The data can be modelled in space group $P nma$ with a twin based on a distribution of the $b$ axis over three perpendicular cubic axes. This model allows full structure determination in the presence of up to six twin fractions from single crystal x-ray diffraction data.

8 pages, including 4 figures