Neutron powder diffraction study of Ba(Ti1−xZrx)O3 at close composition intervals has revealed coexistence of ferroelectric phases: orthorhombic (Amm2) + tetragonal (P4mm) for 0.02 ≤ x ≤0.05 and rhombohedral (R3m) + orthorhombic (Amm2) for 0.07 ≤ x < 0.09. These compositions exhibit relatively enhanced piezoelectric properties as compared to their single phase counterparts outside this composition region, confirming the polymorphic phase boundary nature of the phase coexistence regions.
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Kalyani et al. (2013) studied this question.
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