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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.


Magnetoelectric voltage coefficients (α31) as a function of dc magnetic field in the L–T mode for (a) trilayers prepared at different temperatures with the ferrite obtained by wet-chemistry, and (b) multilayers with ferrites obtained by wet-chemistry (WC) and mechanochemical activation (MCA).
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Figure 11: Magnetoelectric voltage coefficients (α31) as a function of dc magnetic field in the L–T mode for (a) trilayers prepared at different temperatures with the ferrite obtained by wet-chemistry, and (b) multilayers with ferrites obtained by wet-chemistry (WC) and mechanochemical activation (MCA).

Mentions: Figure 11(a) shows the magnetoelectric voltage coefficients as a function of dc magnetic field in the longitudinal-transverse field mode (Hac = 10 Oe at 10 kHz) of trilayers prepared at different temperatures with the ferrite by wet-chemistry. The curves were found to be closely related to the trend of those in figure 10(b), although the maximum α31 coefficient of about 35 mV cm−1 Oe−1 was obtained for the trilayer prepared at 900 °C. The peak voltage coefficient was obtained at relatively low dc fields (about 200–230 Oe), and increases with decreasing SPS temperature following the anticipated trend. Despite the fact that the inherent properties of the constituent phases for the trilayer at 1000 °C were better, the α31 coefficient was lower due to the poorer elastic coupling between two phases, emphasizing the role of the strain continuity across the interface. The α31 coefficient and the Hdc for the peak position in trilayers and multilayers are also included in table 1.


High-sensitivity piezoelectric perovskites for magnetoelectric composites
Magnetoelectric voltage coefficients (α31) as a function of dc magnetic field in the L–T mode for (a) trilayers prepared at different temperatures with the ferrite obtained by wet-chemistry, and (b) multilayers with 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 11: Magnetoelectric voltage coefficients (α31) as a function of dc magnetic field in the L–T mode for (a) trilayers prepared at different temperatures with the ferrite obtained by wet-chemistry, and (b) multilayers with ferrites obtained by wet-chemistry (WC) and mechanochemical activation (MCA).
Mentions: Figure 11(a) shows the magnetoelectric voltage coefficients as a function of dc magnetic field in the longitudinal-transverse field mode (Hac = 10 Oe at 10 kHz) of trilayers prepared at different temperatures with the ferrite by wet-chemistry. The curves were found to be closely related to the trend of those in figure 10(b), although the maximum α31 coefficient of about 35 mV cm−1 Oe−1 was obtained for the trilayer prepared at 900 °C. The peak voltage coefficient was obtained at relatively low dc fields (about 200–230 Oe), and increases with decreasing SPS temperature following the anticipated trend. Despite the fact that the inherent properties of the constituent phases for the trilayer at 1000 °C were better, the α31 coefficient was lower due to the poorer elastic coupling between two phases, emphasizing the role of the strain continuity across the interface. The α31 coefficient and the Hdc for the peak position in trilayers and multilayers are also included in table 1.

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.