Scholarly Works, Center for Energy Harvesting Materials and Systems (CEHMS)

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Browsing Scholarly Works, Center for Energy Harvesting Materials and Systems (CEHMS) by Subject "Alternating current power transmission"

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    Low-frequency nanotesla sensitivity in Metglas/piezoelectric/carbon fiber/piezoelectric composites with active tip mass
    Park, Chee-Sung; Avirovik, Dragan; Bressers, Scott; Priya, Shashank (AIP Publishing, 2011-02-01)
    We report nanotesla sensitivity in Metglas/piezoelectric/carbon fiber/piezoelectric laminates with active tip mass operating in the vicinity of second bending mode. The peak magnetoelectric response for the laminate with an active tip mass (1 g) in longitudinal-transversal mode under H(dc)=8 Oe and H(ac)=1 Oe was found to be similar to 1.08 V/cm Oe at 43 Hz (first bending mode) and similar to 19 V/cm Oe at 511 Hz (second bending mode). At the standard 1 kHz frequency, the maximum resolution of 5 nT was measured under H(ac)=0.5 Oe. (C) 2011 American Institute of Physics. [doi:10.1063/1.3552970]
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    Near-flat self-biased magnetoelectric response in geometry gradient composite
    Zhou, Yuan; Priya, Shashank (American Institute of Physics, 2014-03-14)
    We demonstrate a near-flat self-biased magnetoelectric (ME) effect in geometry gradient magnetostrictive-piezoelectric laminates. The near-flat behavior was characterized by a stable ME response over a wide range of magnetic DC bias. By adjusting the configuration of the magnetostrictive layer, we were able to control the magnitude of the self-biased magnetoelectric coefficient. The ME response was found to be almost independent of the applied DC bias in the range of 0 similar to 260 Oe. This bandwidth was almost 650% similar to 3800% higher than that of the conventional ME composites. This significant advancement opens great potential towards the development of high stability/sensitivity magnetic field sensors and energy harvesters. (C) 2014 AIP Publishing LLC.
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    Room-temperature magnetoelectric coupling in single-phase BaTiO3-BiFeO3 system
    Yang, Su-Chul; Kumar, Ashok; Petkov, Valeri; Priya, Shashank (American Institute of Physics, 2013-04-14)
    In this paper, single-phase multiferroic ceramics of (1 - x) BaTiO3 - x BiFeO3 (BT - x BFO) were synthesized by solid-solution method in the wide range of material composition (x = 0.025 - 1.0). The changes in crystal structure were confirmed via X-ray diffractions (XRD) and atomic pair distribution functions (PDFs). The room-temperature ME coupling was found to exhibit significant magnitude in the narrow composition window (x = 0.71 - 0.8) where the average crystal structure was found to be rhombohedral. Especially, the BT - 0.725 BFO ceramics containing local monoclinic distortions within rhombohedral phase were found to exhibit high room-temperature ME coefficient (alpha(ME)) of 0.87mV/cm.Oe with high piezoelectric properties (g(33) = 18.5 x 10 mV m N-1 and d(33) = 124 pC N-1). We believe that the high room-temperature ME coupling in single-phase lead-free BT-BFO ceramics provides a possibility of developing electrically or magnetically tunable thin-film devices. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4799591]