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The novel sandwich composites were prepared by sandwiching a polyvinylidene fluoride/Tb- Dy-Fe alloy composite(FVDF/Terfenol-D)between polyvinylidene fluoride/lead zirconate titanate composites (PVDF/PZT).The maximum magnetoelectric effect voltage coefficient,(dE/dH)_(33max),of the sandwich composites is higher than that of three-phase composites at their own optimal loading level of Terfenol-D.This is attributed to less interface relaxations of strain and better polarization of the sandwich composites.When the volume fraction of Terfenol-D is higher than 0.10,no coupling interaction for three-phase composites could be observed,but(dE/dH)_(33max) of sandwiched composites still reached 20 mV/(cm·Oe).At high magnetic field intensity,the magnetoelectric effect voltage coefficient,(dE/dH)_(33),of sandwich composites is higher than that of three-phase composites;at low magnetic field intensity,(dE/dH)_(33) of sandwich composites is lower than that of three-phase composites.At their resonance frequency,the (dE/dH)_(33max) of the sandwich composites and the three phase composites are 150 mV/(cm·Oe)and 42 mV/(cm·Oe),respectively.This significant increase of(dE/ dH)_(33max) at resonance frequency confirms the improvement of maximum magnetoelectric effect coefficient via sandwich-structured composites.
The novel sandwich composites were prepared by sandwiching a polyvinylidene fluoride / Tb-Dy-Fe alloy composite (FVDF / Terfenol-D) between polyvinylidene fluoride / lead zirconate titanate composites (PVDF / PZT) dH) _ (33max), of the sandwich composites is higher than that of three-phase composites at their own optimal load loading level of Terfenol-D.This is attributed to less interface relaxations of strain and better polarization of the sandwich composites. volume fraction of Terfenol-D is higher than 0.10, no coupling interaction for three-phase composites could be observed, but (dE / dH) _ (33max) of sandwiched composites still reached 20 mV / (cm · Oe) field intensity, the magnetoelectric effect voltage coefficient, (dE / dH) _ (33), of sandwich composites is higher than that of three-phase composites; at low magnetic field intensity, (dE / dH) is lower than that of three-phase composites. At their resonan (dE / dH) _ (33max) of the sandwich composites and the three phase composites are 150 mV / (cm · Oe) and 42 mV / (cm · Oe) dH) (33max) at resonance frequency confirms the improvement of maximum magnetoelectric effect coefficient via sandwich-structured composites.