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High-sensitivity piezoelectric perovskites for magnetoelectric composites

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.


Evolution of the perovskite average grain size with the distance from the interface for trilayers prepared by SPS at 900 °C, using ferrites obtained by wet-chemistry (WC) and mechanochemical activation (MCA).
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Figure 5: Evolution of the perovskite average grain size with the distance from the interface for trilayers prepared by SPS at 900 °C, using ferrites obtained by wet-chemistry (WC) and mechanochemical activation (MCA).

Mentions: Nevertheless, none of the trilayers of figure 4 showed a homogeneous microstructure over the whole perovskite phase, and instead grain size gradients were obtained from the interface to the inner BSPT matrix, which spreads over a region that extends up to 200 μm. Figure 5 shows the evolutions of the perovskite average grain size with distance from the interface for the trilayer prepared at 900 °C (curve with open dots). The plot is given in log–log scale for a better visualization of the data evolution, and the SD calculated from the size distributions are indicated as the error bars. The grain size shows a peculiar evolution with distance for this trilayer prepared with the spinel obtained by mechanochemical synthesis, for which a minimum average size of ∼0.4 μm was achieved at about 10 to 20 μm from the interface, and then evolves up to about 2.5 μm (at 200 μm away the interface).


High-sensitivity piezoelectric perovskites for magnetoelectric composites
Evolution of the perovskite average grain size with the distance from the interface for trilayers prepared by SPS at 900 °C, using ferrites obtained by wet-chemistry (WC) and mechanochemical activation (MCA).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 5: Evolution of the perovskite average grain size with the distance from the interface for trilayers prepared by SPS at 900 °C, using ferrites obtained by wet-chemistry (WC) and mechanochemical activation (MCA).
Mentions: Nevertheless, none of the trilayers of figure 4 showed a homogeneous microstructure over the whole perovskite phase, and instead grain size gradients were obtained from the interface to the inner BSPT matrix, which spreads over a region that extends up to 200 μm. Figure 5 shows the evolutions of the perovskite average grain size with distance from the interface for the trilayer prepared at 900 °C (curve with open dots). The plot is given in log–log scale for a better visualization of the data evolution, and the SD calculated from the size distributions are indicated as the error bars. The grain size shows a peculiar evolution with distance for this trilayer prepared with the spinel obtained by mechanochemical synthesis, for which a minimum average size of ∼0.4 μm was achieved at about 10 to 20 μm from the interface, and then evolves up to about 2.5 μm (at 200 μm away the interface).

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.