Synthesis, dielectric behavior and impedance measurement studies of Cr-substituted Zn-Mn ferrites

Journal Article · Tue Mar 15 00:00:00 EDT 2011 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2010.11.026· OSTI ID:22210010

Garadkar, K. M. ^[1]; Sasikala, R. ^[2]; Chougule, B. K. ^[3]

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1. Department of Chemistry, Shivaji University, Kolhapur 416004 (India)
2. Chemistry Division, Bhabha Atomic Research Center, Mumbai 400085, Maharashtra (India)
3. Department of Physics, Shivaji University, Kolhapur 416004 (India)

Graphical abstract: Variation of dielectric constant with frequency. Research highlights: {yields} Sol-gel route synthesized spherical crystalline nanoparticles of ZnMn{sub 1-x}Cr{sub x}FeO{sub 4}. {yields} XRD, DTA, FTIR, SEM, dielectric and impedance study. {yields} The ferrites show concentration dependence of ac electrical conductivity. {yields} Impedance response is dominated by grain boundary behavior. -- Abstract: Nanocrystalline ZnMn{sub 1-x}Cr{sub x}FeO{sub 4} (1.0 {>=} x {>=} 0) ferrites were synthesized by sol-gel technique. X-ray diffraction (XRD) confirmed the formation of single phasic cubic spinel lattice for all the compositions studied. Lattice parameter shows a decreasing trend with an increase in Cr content in the compositions. Formation of spherical nanoparticles was revealed by scanning electron microscopy (SEM) analysis. Infrared spectroscopic studies revealed two main absorption bands in the range 400-800 cm{sup -1} arising due to tetrahedral (A) and octahedral (B) site vibrations. Dielectric constant, dielectric loss tangent, ac conductivity and complex impedance were measured as a function of frequency in the range 20 Hz to 1 MHz. Frequency dependence of dielectric constant shows dielectric dispersion due to the Maxwell-Wagner type of interfacial polarization. The role of chromium in modifying structural and dielectric properties of these ferrites has been explained.

• OSTI ID: 22210010
• Journal Information: Materials Research Bulletin, Vol. 46, Issue 3; Other Information: Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
77 NANOSCIENCE AND NANOTECHNOLOGY
ABSORPTION
ABSORPTION SPECTROSCOPY
CRYSTALS
DIELECTRIC MATERIALS
ELECTRIC CONDUCTIVITY
FERRITE
FERRITES
FOURIER TRANSFORMATION
FREQUENCY DEPENDENCE
GRAIN BOUNDARIES
INFRARED SPECTRA
LATTICE PARAMETERS
NANOSTRUCTURES
PERMITTIVITY
SCANNING ELECTRON MICROSCOPY
SOL-GEL PROCESS
SPINELS
SYNTHESIS
X-RAY DIFFRACTION