We have found that laminate composites consisting of longitudinally magnetized magnetostrictive Terfenol-D and longitudinally poled piezoelectric Pb(Zr,Ti)O3 layers have dramatically enhanced magnetoelectric effects when driven near resonance. The maximum induced magnetoelectric voltage at resonance was ∼10 Vp/Oe, which is ∼102 times higher than previous reports at subresonant frequencies.
It has been found that aliovalent-substituted BiFeO 3 -PbTiO 3 -based polycrystalline materials have significantly enhanced multiferroic properties. Relative to unmodified BiFeO 3 , our results for modified BiFeO 3 -PbTiO 3 -based ceramics reveal: ͑i͒ a dramatic increase in the electric-field-induced polarization; and ͑ii͒ the establishment of a remanent magnetization. The results evidence the destruction of a space-modulated spin structure in bulk materials, via substituent effects, releasing a latent magnetization locked within the cycloid.
Crystalline solutions of (1−x)(Bi,La)(Fe0.95Ga0.05)O3–xPbTiO3 (BLGF–PT) have been fabricated with La concentrations of 0, 10, and 20 at. %. The BLGF–PT system has been found to have excellent insulation resistivity ⩽1013 Ω cm. In addition, La substituent was found to decrease the coercive field, resulting in much improved dielectric and piezoelectric properties. A shift in the morphotropic phase boundary of BLGF–PT with increasing La content was identified for x=0.3, 0.4, and 0.43. We have achieved optimized dielectric constant, loss factor, Curie temperature, remnant polarization, and piezoelectric d33 properties of 881, 0.037, 386 °C, 30 μC/cm2 and 163 pC/N, respectively, for 0.6BLGF–0.4PT with 10 at. % La. These results clearly demonstrate that BLGF–PT is a competitive alternative piezoelectric material to Pb(Zr,Ti)O3 with reduced lead content.
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