Browsing by Author "University of Texas at Arlington. Department of Materials Science and Engineering"

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    Giant magnetoelectric effect in sintered multilayered composite structures
    Islam, Rashed Adnan; Ni, Yong; Khachaturyan, Armen G.; Priya, Shashank (American Institute of Physics, 2008-08-15)
    Trilayer composites consisting of 0.9Pb(Zr(0.52)Ti(0.48))O(3)-0-1Pb(Zn(1/3)Nb(2/3))O(3) (0.9 PZT-0.1 PZN) and Ni(0.6)Cu(0.2)Zn(0.2)Fe(2)O(4) (NCZF) in the configuration NCZF-(0.9 PZT-0.1 PZN)-NCZF were synthesized using pressure assisted sintering. Composites with optimized magnetostrictive to piezoelectric thickness ratio showed a high magnetoelectric (ME) coefficient of 525 mV/cm Oe. Further enhancement in the magnitude of ME coefficient was obtained (595 mV/cm Oe) when the angle of applied dc magnetic field was changed to 45 degrees. Changing the intermediate piezoelectric layer from single to trilayer stack geometry configuration leads to the realization of giant ME response of 782 mV/cm Oe in sintered composites. (C) 2008 American Institute of Physics.
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    Magnetoelectric properties of core-shell particulate nanocomposites
    Islam, Rashed Adnan; Bedekar, Vishwas; Poudyal, Narayan; Liu, J. Ping; Priya, Shashank (American Institute of Physics, 2008-11-15)
    In this study, we report results on magnetoelectric (ME) core-shell Pb(Zr,Ti)O(3) (PZT)-NiFe(2)O(4) (NF) particulate nanocomposites. NF particles forming the shell had size in range of 20-30 nm. The grain size of sintered nanocomposites was found to be in the range of 500-800 nm. The sintered nanocomposite exhibited piezoelectric coefficient (d(33)) of 60 pC/N, dielectric constant of 865, and ME coefficient of 195 mV/cm Oe. High ME coefficient was observed for wide range of dc bias magnetic field. This approach of fabricating layered composite has a promise to provide large ME coefficients in particulate sintered structures.