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High-sensitivity piezoelectric perovskites for magnetoelectric composites

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ABSTRACT

A highly topical set of perovskite oxides are high-sensitivity piezoelectric ones, among which Pb(Zr,Ti)O3 at the morphotropic phase boundary (MPB) between ferroelectric rhombohedral and tetragonal polymorphic phases is reckoned a case study. Piezoelectric ceramics are used in a wide range of mature, electromechanical transduction technologies like piezoelectric sensors, actuators and ultrasound generation, to name only a few examples, and more recently for demonstrating novel applications like magnetoelectric composites. In this case, piezoelectric perovskites are combined with magnetostrictive materials to provide magnetoelectricity as a product property of the piezoelectricity and piezomagnetism of the component phases. Interfaces play a key issue, for they control the mechanical coupling between the piezoresponsive phases. We present here main results of our investigation on the suitability of the high sensitivity MPB piezoelectric perovskite BiScO3–PbTiO3 in combination with ferrimagnetic spinel oxides for magnetoelectric composites. Emphasis has been put on the processing at low temperature to control reactions and interdiffusion between the two oxides. The role of the grain size effects is extensively addressed.

No MeSH data available.


(a) Ferroelectric hysteresis loops for BiScO3–PbTiO3 ceramics obtained at different SPS temperatures, and (b) evolution of the remnant polarization (Pr) and d33 piezoelectric coefficient with increasing grain size.
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Figure 3: (a) Ferroelectric hysteresis loops for BiScO3–PbTiO3 ceramics obtained at different SPS temperatures, and (b) evolution of the remnant polarization (Pr) and d33 piezoelectric coefficient with increasing grain size.

Mentions: Figure 3(a) illustrates the grain size effect on the ferroelectric switching of these ceramics. Square hysteresis loops close to saturation of the polarization are obtained for ceramics with grain sizes about and above 1 μm. Remnant polarization Pr slowly decreases from 40 to 36 μC cm−2 when entering the submicron range, and then drops down to 27 μC cm−2 as the grain size was reduced to 0.35 μm, and only 5 μC cm−2 was achieved for 0.1 μm. Size effects were also observed in the piezoelectric charge coefficient d33 (figure 3(b)), which slowly decreases from 440 to 400 pC N−1 when entering the submicron range, and suddenly drops down to 285 and 55 pC N−1 for 0.35 and 0.10 μm, respectively.


High-sensitivity piezoelectric perovskites for magnetoelectric composites
(a) Ferroelectric hysteresis loops for BiScO3–PbTiO3 ceramics obtained at different SPS temperatures, and (b) evolution of the remnant polarization (Pr) and d33 piezoelectric coefficient with increasing grain size.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC5036485&req=5

Figure 3: (a) Ferroelectric hysteresis loops for BiScO3–PbTiO3 ceramics obtained at different SPS temperatures, and (b) evolution of the remnant polarization (Pr) and d33 piezoelectric coefficient with increasing grain size.
Mentions: Figure 3(a) illustrates the grain size effect on the ferroelectric switching of these ceramics. Square hysteresis loops close to saturation of the polarization are obtained for ceramics with grain sizes about and above 1 μm. Remnant polarization Pr slowly decreases from 40 to 36 μC cm−2 when entering the submicron range, and then drops down to 27 μC cm−2 as the grain size was reduced to 0.35 μm, and only 5 μC cm−2 was achieved for 0.1 μm. Size effects were also observed in the piezoelectric charge coefficient d33 (figure 3(b)), which slowly decreases from 440 to 400 pC N−1 when entering the submicron range, and suddenly drops down to 285 and 55 pC N−1 for 0.35 and 0.10 μm, respectively.

View Article: PubMed Central - PubMed

ABSTRACT

A highly topical set of perovskite oxides are high-sensitivity piezoelectric ones, among which Pb(Zr,Ti)O3 at the morphotropic phase boundary (MPB) between ferroelectric rhombohedral and tetragonal polymorphic phases is reckoned a case study. Piezoelectric ceramics are used in a wide range of mature, electromechanical transduction technologies like piezoelectric sensors, actuators and ultrasound generation, to name only a few examples, and more recently for demonstrating novel applications like magnetoelectric composites. In this case, piezoelectric perovskites are combined with magnetostrictive materials to provide magnetoelectricity as a product property of the piezoelectricity and piezomagnetism of the component phases. Interfaces play a key issue, for they control the mechanical coupling between the piezoresponsive phases. We present here main results of our investigation on the suitability of the high sensitivity MPB piezoelectric perovskite BiScO3–PbTiO3 in combination with ferrimagnetic spinel oxides for magnetoelectric composites. Emphasis has been put on the processing at low temperature to control reactions and interdiffusion between the two oxides. The role of the grain size effects is extensively addressed.

No MeSH data available.