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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.


XRD patterns corresponding to (a) the 0.36BiScO3–0.64PbTiO3 perovskite phase; and those for the NiFe2O4 spinel phases obtained by (b) mechanochemical activation and (c) wet-chemistry, after annealing at 600 °C.
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Figure 1: XRD patterns corresponding to (a) the 0.36BiScO3–0.64PbTiO3 perovskite phase; and those for the NiFe2O4 spinel phases obtained by (b) mechanochemical activation and (c) wet-chemistry, after annealing at 600 °C.

Mentions: Perovskite phase nanocrystalline powders of 0.36BiScO3–0.64PbTiO3 (BSPT) were obtained by mechanochemical treatment of stoichiometric mixtures of analytical grade Bi2O3, Sc2O3, PbO and TiO2, with a Pulverisette 6 (Fritsch) planetary mill. The mechanosynthesis of the perovskite as single phase was successfully achieved after only 20 h of milling, as shown in figure 1(a). An average particle size of 23 nm with standard deviation (SD) of 11 nm resulted, as measured by transmission electron microscopy (TEM) [31]. For the mechanochemical synthesis of the NiFe2O4, analytical grade NiO and Fe2O3 were used as starting reagents. The spinel phase could be completely isolated after a thermal treatment at 600 °C/2 h, as shown in figure 1(b). An average particle size of 30 nm with SD of 13 nm resulted. Details of the procedures and of the mechanisms taking place during the mechanosynthesis of these two systems, the perovskite and the spinel, can be found elsewhere [13, 31].


High-sensitivity piezoelectric perovskites for magnetoelectric composites
XRD patterns corresponding to (a) the 0.36BiScO3–0.64PbTiO3 perovskite phase; and those for the NiFe2O4 spinel phases obtained by (b) mechanochemical activation and (c) wet-chemistry, after annealing at 600 °C.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 1: XRD patterns corresponding to (a) the 0.36BiScO3–0.64PbTiO3 perovskite phase; and those for the NiFe2O4 spinel phases obtained by (b) mechanochemical activation and (c) wet-chemistry, after annealing at 600 °C.
Mentions: Perovskite phase nanocrystalline powders of 0.36BiScO3–0.64PbTiO3 (BSPT) were obtained by mechanochemical treatment of stoichiometric mixtures of analytical grade Bi2O3, Sc2O3, PbO and TiO2, with a Pulverisette 6 (Fritsch) planetary mill. The mechanosynthesis of the perovskite as single phase was successfully achieved after only 20 h of milling, as shown in figure 1(a). An average particle size of 23 nm with standard deviation (SD) of 11 nm resulted, as measured by transmission electron microscopy (TEM) [31]. For the mechanochemical synthesis of the NiFe2O4, analytical grade NiO and Fe2O3 were used as starting reagents. The spinel phase could be completely isolated after a thermal treatment at 600 °C/2 h, as shown in figure 1(b). An average particle size of 30 nm with SD of 13 nm resulted. Details of the procedures and of the mechanisms taking place during the mechanosynthesis of these two systems, the perovskite and the spinel, can be found elsewhere [13, 31].

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.