Frequency dependence of the complex impedances and dielectric behaviour of some Mg-Zn ferrites

M. H. Abdullah, Ahmad Nazlim Yusoff

Research output: Contribution to journalArticle

73 Citations (Scopus)

Abstract

Complex impedances of some magnesium zinc ferrites, MgxZn1 - xFe2O4 (x = 0.4, 0.5, 0.6 and 0.7), in the frequency range of 1 mHz-10 MHz were measured at 300 K. The complex-plane impedance spectrum from each sample indicates that the capacitive and the resistive properties of the materials are mainly attributed to the processes that associated with the bulk (grain) and the grain boundary. A low-frequency dispersion (LFD) and a negative capacitance regions are also observed at low frequencies. A small series resistance of about the same value for all samples is also observed. The bulk and the grain boundary components are analysed by assuming a two-layer leaky capacitor. The simulated complex impedances using the Cole Cole expression are in agreement with the measured values. The dielectric properties of the materials are attributed to the interfacial polarization and LFD at low frequencies and the orientational polarization at high frequencies. These properties result in the dielectric loss which composed of a Debye-like loss peak at high frequency end and a strong LFD below 1 Hz. Both regions exhibit universality with regard to the power-law relation between the dielectric loss (ε″r or χ″) and frequency as given by ε″r ∝ ωn - 1, where n = 0.14 and n = 0.02, respectively. The exponent is marginally negative, n = -0.03, in the region of negative capacitance below 3-4 mHz. The variations of the above properties and the characteristic parameters for different compositions of the Mg Zn ferrites are discussed.

Original languageEnglish
Pages (from-to)5817-5823
Number of pages7
JournalJournal of Materials Science
Volume32
Issue number21
Publication statusPublished - 1997

Fingerprint

Ferrites
Dielectric losses
Grain boundaries
Capacitance
Polarization
Dielectric properties
Magnesium
Zinc
Capacitors
Chemical analysis

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Frequency dependence of the complex impedances and dielectric behaviour of some Mg-Zn ferrites. / Abdullah, M. H.; Yusoff, Ahmad Nazlim.

In: Journal of Materials Science, Vol. 32, No. 21, 1997, p. 5817-5823.

Research output: Contribution to journalArticle

@article{e37f055a2c4d45a6a942324ae22d13d3,
title = "Frequency dependence of the complex impedances and dielectric behaviour of some Mg-Zn ferrites",
abstract = "Complex impedances of some magnesium zinc ferrites, MgxZn1 - xFe2O4 (x = 0.4, 0.5, 0.6 and 0.7), in the frequency range of 1 mHz-10 MHz were measured at 300 K. The complex-plane impedance spectrum from each sample indicates that the capacitive and the resistive properties of the materials are mainly attributed to the processes that associated with the bulk (grain) and the grain boundary. A low-frequency dispersion (LFD) and a negative capacitance regions are also observed at low frequencies. A small series resistance of about the same value for all samples is also observed. The bulk and the grain boundary components are analysed by assuming a two-layer leaky capacitor. The simulated complex impedances using the Cole Cole expression are in agreement with the measured values. The dielectric properties of the materials are attributed to the interfacial polarization and LFD at low frequencies and the orientational polarization at high frequencies. These properties result in the dielectric loss which composed of a Debye-like loss peak at high frequency end and a strong LFD below 1 Hz. Both regions exhibit universality with regard to the power-law relation between the dielectric loss (ε″r or χ″) and frequency as given by ε″r ∝ ωn - 1, where n = 0.14 and n = 0.02, respectively. The exponent is marginally negative, n = -0.03, in the region of negative capacitance below 3-4 mHz. The variations of the above properties and the characteristic parameters for different compositions of the Mg Zn ferrites are discussed.",
author = "Abdullah, {M. H.} and Yusoff, {Ahmad Nazlim}",
year = "1997",
language = "English",
volume = "32",
pages = "5817--5823",
journal = "Journal of Materials Science",
issn = "0022-2461",
publisher = "Springer Netherlands",
number = "21",

}

TY - JOUR

T1 - Frequency dependence of the complex impedances and dielectric behaviour of some Mg-Zn ferrites

AU - Abdullah, M. H.

AU - Yusoff, Ahmad Nazlim

PY - 1997

Y1 - 1997

N2 - Complex impedances of some magnesium zinc ferrites, MgxZn1 - xFe2O4 (x = 0.4, 0.5, 0.6 and 0.7), in the frequency range of 1 mHz-10 MHz were measured at 300 K. The complex-plane impedance spectrum from each sample indicates that the capacitive and the resistive properties of the materials are mainly attributed to the processes that associated with the bulk (grain) and the grain boundary. A low-frequency dispersion (LFD) and a negative capacitance regions are also observed at low frequencies. A small series resistance of about the same value for all samples is also observed. The bulk and the grain boundary components are analysed by assuming a two-layer leaky capacitor. The simulated complex impedances using the Cole Cole expression are in agreement with the measured values. The dielectric properties of the materials are attributed to the interfacial polarization and LFD at low frequencies and the orientational polarization at high frequencies. These properties result in the dielectric loss which composed of a Debye-like loss peak at high frequency end and a strong LFD below 1 Hz. Both regions exhibit universality with regard to the power-law relation between the dielectric loss (ε″r or χ″) and frequency as given by ε″r ∝ ωn - 1, where n = 0.14 and n = 0.02, respectively. The exponent is marginally negative, n = -0.03, in the region of negative capacitance below 3-4 mHz. The variations of the above properties and the characteristic parameters for different compositions of the Mg Zn ferrites are discussed.

AB - Complex impedances of some magnesium zinc ferrites, MgxZn1 - xFe2O4 (x = 0.4, 0.5, 0.6 and 0.7), in the frequency range of 1 mHz-10 MHz were measured at 300 K. The complex-plane impedance spectrum from each sample indicates that the capacitive and the resistive properties of the materials are mainly attributed to the processes that associated with the bulk (grain) and the grain boundary. A low-frequency dispersion (LFD) and a negative capacitance regions are also observed at low frequencies. A small series resistance of about the same value for all samples is also observed. The bulk and the grain boundary components are analysed by assuming a two-layer leaky capacitor. The simulated complex impedances using the Cole Cole expression are in agreement with the measured values. The dielectric properties of the materials are attributed to the interfacial polarization and LFD at low frequencies and the orientational polarization at high frequencies. These properties result in the dielectric loss which composed of a Debye-like loss peak at high frequency end and a strong LFD below 1 Hz. Both regions exhibit universality with regard to the power-law relation between the dielectric loss (ε″r or χ″) and frequency as given by ε″r ∝ ωn - 1, where n = 0.14 and n = 0.02, respectively. The exponent is marginally negative, n = -0.03, in the region of negative capacitance below 3-4 mHz. The variations of the above properties and the characteristic parameters for different compositions of the Mg Zn ferrites are discussed.

UR - http://www.scopus.com/inward/record.url?scp=0031277058&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031277058&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0031277058

VL - 32

SP - 5817

EP - 5823

JO - Journal of Materials Science

JF - Journal of Materials Science

SN - 0022-2461

IS - 21

ER -