Abstract
A careful phase analysis and TEM investigation of the (Bi1−xCax)FeIIIO3−x/2Vx/2 (V for vacancy), ~0.20 ≤ x ≤ ~0.50, and (Bi1−xSrx)Fe3+O3−x/2Vx/2, 0.2 ≤ x ≤ 0.67, perovskite related solid solution fields has been carried out. Both solid solution fields are, in general, (3+1)-d incommensurately modulated with an incommensurate primary modulation wave-vector magnitude that varies systematically with composition. High Resolution (HR)TEM imaging is used to show the presence of at least 6-fold twinning on a sometimes rather fine scale, the fine scale twinning being more prevalent in the M = Sr than the M = Ca system. The (3+1)-d superspace group symmetry is suggested to be Cmmm (01γ) 0s0 or one of the non-centrosymmetric sub-groups thereof. The magnetic and electrical properties of the systems are briefly discussed and a tentative structural model proposed.
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