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Two-dimensional diffraction images taken from to in composition spread. The indexes are assigned using the perovskite (rhombohedral) structure. Beyond , the (002) spot is a mixture of (002), (020), and (200) spots due to twinning. The and spots starting at indicate cell doubling. goes from rhombohedral (unit cell in red) to orthorhombic (unit cell in blue). Beyond , the compound is paraelectric.
Polarization hysteresis loops for three selected compositions. The relatively high polarization of is maintained for . Beyond MPB and until , AFE characteristics are observed (as seen for here).
Dielectric constant and measured at (zero bias). The curve is a guide to the eye.
Piezoelectric properties of (a) loops for and .(b) High-field determined from the piezoelectric hysteresis loops measured as a function of composition. The curve is a guide to the eye. (c) AFE loop observed for .
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