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Triple-point-type morphotropic phase boundary based large piezoelectric Pb-free material—Ba(Ti0.8Hf0.2)O3-(Ba0.7Ca0.3)TiO3
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View: Figures


Image of FIG. 1.
FIG. 1.

A TMPB involved with two terminal compositions, which possess a common cubic parent phase, and two different ferroelectric phases—rhombohedral ferroelectric phase (R) and tetragonal ferroelectric phase (T). A TP appears at the intersection of two phase-boundary lines—Curie line and TMPB line. (a) Illustrates the Landau free energy profile with the temperature across TP for composition x TP, and (b) and (c) illustrate the Landau free energy profiles with temperature across Curie line for compositions approaching to R and T terminals, with TR and TT represent the two paraelectric-ferroelectric transition temperatures, respectively. Phase diagram of binary piezoelectric Pb(Zr1−xTix)O3 (d), and phase diagram of pseudo-binary (1-x)Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 system (e).

Image of FIG. 2.
FIG. 2.

Dielectric permittivity of BHT-0.1BCT (a1), BHT-0.3BCT (a2), BHT-0.5BCT (a3), BHT-0.7BCT (a4); x ray diffraction profiles of BHT-0.5BCT of (200) peak at 40 °C (b1), 22 °C (b2), −50 °C (b3), and of (222) peak at 40 °C (b4), 22 °C (b5), −50 °C (b6); phase diagram of pseudo-binary BHT-xBCT system (c).

Image of FIG. 3.
FIG. 3.

Ferroelectric and piezoelectric properties of BHT-xBCT system with respect to composition around TMPB (x = 0.5, temperature ∼22 °C), maximum polarization Pm (a1), remnant polarization Pr (a2), coercive field Ec (a3), dielectric permittivity (a4), piezoelectric coefficient d 33 (a5); P-E hysteresis loops of BHT-0.4BCT (b1), BHT-0.5BCT (b2), BHT-0.6BCT (b3); transition thermal hysteresis for BHT-xBCT (x: 0.1-0.6) (c), with THC→R, THC→T, and THR→T, representing the transition thermal hysteresis between different phases—cubic to rhombohedral, cubic to tetragonal, and rhombohedral to tetragonal, respectively.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Triple-point-type morphotropic phase boundary based large piezoelectric Pb-free material—Ba(Ti0.8Hf0.2)O3-(Ba0.7Ca0.3)TiO3