Issue 4, 2015

Origin of magnetocapacitance in chemically homogeneous and inhomogeneous ferrites

Abstract

The present work mainly focuses on the magnetodielectric (MD) effect in polycrystalline Ni0.9−yCuyZn0.1Fe1.98O3.97 (y = 0, 0.1, 0.2, 0.3, 0.4, 0.5) ferrite synthesized by a solid-state reaction method. Sintered samples showed the formation of CuO-rich grain boundary segregation for y ≥ 0.2. The appearance of segregation made the present material chemically inhomogeneous and electrically heterogeneous. A negative MD response was observed in homogeneous ferrite for y = 0 and 0.1 due to lattice distortion (an intrinsic effect), whereas a positive MD response occurs in chemically inhomogeneous segregated ferrite (y ≥ 0.2) due the collective effects of Maxwell–Wagner (MW) polarization with intrinsic magnetoresistance (an extrinsic effect).

Graphical abstract: Origin of magnetocapacitance in chemically homogeneous and inhomogeneous ferrites

Article information

Article type
Paper
Submitted
29 Sep 2014
Accepted
01 Dec 2014
First published
01 Dec 2014

Phys. Chem. Chem. Phys., 2015,17, 2432-2437

Origin of magnetocapacitance in chemically homogeneous and inhomogeneous ferrites

R. A. Mondal, B. S. Murty and V. R. K. Murthy, Phys. Chem. Chem. Phys., 2015, 17, 2432 DOI: 10.1039/C4CP04398G

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