Abstract
A (110) twin domain in Ba2TiGe2O8 was imaged using high-resolution transmission electron microscopy, HRTEM. The interface would not be visible due to the very weak orthorhombic deformation of the unit cell (0.15 %) alone. But since a modulated structure along the b*-direction is developed, the boundary can be localised. An experimental method for the detailed characterisation of the atomistic domain-boundary structure is proposed.
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