Abstract
An alternative chemical approach was used to prepare the ferroelectric Aurivillius phase Bi 3LaTi 3O 12 (BLT1.00) at low temperature (450°C) leading to well-crystallized compounds at 750°C. The existence of 90°-oriented twin domains, characteristic of a ferroelectric state, was revealed in selected area electron diffraction and microdiffraction studies. Though the 3D reconstruction of the reciprocal lattice enables to propose the non-centrosymmetrical orthorhombic space group (SG) B2 cm, a further convergent-beam electron diffraction study was undertaken in order to ascertain the symmetry. The monoclinic symmetry was clearly identified. BLT1.00 crystallizes in the polar SG B1 c1 (no. 7, non-standard setting of P1 c1) instead of I4/ mmm, as previously reported.
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