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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.


Representative SEM images of polished cross-sections at perovskite/spinel interfaces in trilayers prepared by SPS at (a) 800, (b) 900 and (c) 1000 °C, using the ferrite obtained by mechanochemical activation.
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Figure 4: Representative SEM images of polished cross-sections at perovskite/spinel interfaces in trilayers prepared by SPS at (a) 800, (b) 900 and (c) 1000 °C, using the ferrite obtained by mechanochemical activation.

Mentions: Figure 4 shows representative SEM images of polished cross-sections of trilayers prepared at 800, 900 and 1000 °C, showing the interface between the perovskite and spinel phases. Chemical reaction and interdiffusion phenomena at the interfaces were not detected, and nor was the occurrence of abnormal grain growth in the perovskite side, as previously reported for composites obtained by hot-pressing or conventional sintering [29, 31]. These abnormal grains were attributed to diffusion of ions from the spinel phase into the perovskite with diffusion lengths of 20 to 30 μm, and thus should result in poorer piezoelectric properties.


High-sensitivity piezoelectric perovskites for magnetoelectric composites
Representative SEM images of polished cross-sections at perovskite/spinel interfaces in trilayers prepared by SPS at (a) 800, (b) 900 and (c) 1000 °C, using the ferrite obtained by mechanochemical activation.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 4: Representative SEM images of polished cross-sections at perovskite/spinel interfaces in trilayers prepared by SPS at (a) 800, (b) 900 and (c) 1000 °C, using the ferrite obtained by mechanochemical activation.
Mentions: Figure 4 shows representative SEM images of polished cross-sections of trilayers prepared at 800, 900 and 1000 °C, showing the interface between the perovskite and spinel phases. Chemical reaction and interdiffusion phenomena at the interfaces were not detected, and nor was the occurrence of abnormal grain growth in the perovskite side, as previously reported for composites obtained by hot-pressing or conventional sintering [29, 31]. These abnormal grains were attributed to diffusion of ions from the spinel phase into the perovskite with diffusion lengths of 20 to 30 μm, and thus should result in poorer piezoelectric properties.

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.