Abstract
The morphtropic phase boundary existing in a perovskite-type solid solution like Pb(Zr,Ti)O3 (PZT) is reconsidered in relation to the order of the ferroelectric phase transition. For the secondorder transition from the paraelectric cubic phase, at the triple point S where the cubic, tetragonal and rhombohedral phases meet, the free energy is isotropic in the order parameter space, and a vertical boundary guarantees dielectrically excellent properties, while for the first-order transition, at the triple point F, the free energy is usually anisotropic, and even a vertical boundary does not necessarily guarantee the best properties.
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Ishibashi, Y., Iwata, M. Reconsideration of the morphotropic phase boundary - the order of the ferroelectric phase transition -. Journal of the Korean Physical Society 66, 1334–1338 (2015). https://doi.org/10.3938/jkps.66.1334
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DOI: https://doi.org/10.3938/jkps.66.1334