Origin of magnetocapacitance in chemically homogeneous and inhomogeneous ferrites. Issue 4 (10th December 2014)

• Record Type: Journal Article
• Authors: Mondal, R. A.; Murty, B. S.; Murthy, V. R. K.
• Is Part Of: Physical chemistry chemical physics. Volume 17:Issue 4(2015)
• Page Start: 2432
• Page End: 2437
• Publication Date: 2014-12-10
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c4cp04398g
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : Lattice distortion and combined negative magnetoresistance with MW polarization contribute to magnetocapacitance in chemically homogeneous and inhomogeneous ferrites, respectively. Abstract : The present work mainly focuses on the magnetodielectric (MD) effect in polycrystalline Ni0.9− y Cu y Zn0.1 Fe1.98 O3.97 ( 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).