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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.


Relative permittivity K′ and dielectric losses (tan δ) as a function of temperature at several frequencies (0.1, 0.5, 1, 5, 10, 50, 100, 500, 1000 kHz; arrows indicate increasing frequency) for (a) the trilayer prepared at 900 °C with the ferrite obtained by wet-chemistry; and (b), (c) multilayers prepared at 900 °C with ferrites obtained by (b) wet-chemistry and (c) mechanochemical activation.
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Figure 7: Relative permittivity K′ and dielectric losses (tan δ) as a function of temperature at several frequencies (0.1, 0.5, 1, 5, 10, 50, 100, 500, 1000 kHz; arrows indicate increasing frequency) for (a) the trilayer prepared at 900 °C with the ferrite obtained by wet-chemistry; and (b), (c) multilayers prepared at 900 °C with ferrites obtained by (b) wet-chemistry and (c) mechanochemical activation.

Mentions: Figure 7(a) shows the relative dielectric permittivity K′ and losses (tan δ) as a function of temperature at several frequencies for the trilayer prepared at 900 °C with the ferrite obtained by wet-chemistry. K′ has been computed with the thickness of the piezoelectric element for comparison with the multilayers. Both K′ and tan δ curves hold a strong resemblance with the typical ones of BSPT ceramics [36], and indicate a very small influence of the spinel in the dielectric response of the trilayer. The anomaly associated with the ferroelectric transition is clearly observed at TC ∼ 470 °C. The pronounced dispersion with frequency in K′ around the ferroelectric transition also resembles the previously reported data for BSPT ceramics, which was described as a grain boundary effect. Indeed, simulation of the electrical response for the grain bulk and boundary contributions shows the low-frequency data to be the closest one to the bulk response [37].


High-sensitivity piezoelectric perovskites for magnetoelectric composites
Relative permittivity K′ and dielectric losses (tan δ) as a function of temperature at several frequencies (0.1, 0.5, 1, 5, 10, 50, 100, 500, 1000 kHz; arrows indicate increasing frequency) for (a) the trilayer prepared at 900 °C with the ferrite obtained by wet-chemistry; and (b), (c) multilayers prepared at 900 °C with ferrites obtained by (b) wet-chemistry and (c) mechanochemical activation.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 7: Relative permittivity K′ and dielectric losses (tan δ) as a function of temperature at several frequencies (0.1, 0.5, 1, 5, 10, 50, 100, 500, 1000 kHz; arrows indicate increasing frequency) for (a) the trilayer prepared at 900 °C with the ferrite obtained by wet-chemistry; and (b), (c) multilayers prepared at 900 °C with ferrites obtained by (b) wet-chemistry and (c) mechanochemical activation.
Mentions: Figure 7(a) shows the relative dielectric permittivity K′ and losses (tan δ) as a function of temperature at several frequencies for the trilayer prepared at 900 °C with the ferrite obtained by wet-chemistry. K′ has been computed with the thickness of the piezoelectric element for comparison with the multilayers. Both K′ and tan δ curves hold a strong resemblance with the typical ones of BSPT ceramics [36], and indicate a very small influence of the spinel in the dielectric response of the trilayer. The anomaly associated with the ferroelectric transition is clearly observed at TC ∼ 470 °C. The pronounced dispersion with frequency in K′ around the ferroelectric transition also resembles the previously reported data for BSPT ceramics, which was described as a grain boundary effect. Indeed, simulation of the electrical response for the grain bulk and boundary contributions shows the low-frequency data to be the closest one to the bulk response [37].

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.