Mechanical and magnetic properties of ZnO/Fe 2O 3 ceramic varistors

A. Sedky*, Kh A. Ziq

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Mechanical and magnetic properties of the ZnO/Fe 2O 3 ceramic varistors have been examined by using mechanical analyzer, digital microhardness tester and vibrating sample magnetometer. The initial stress-strain behavior is found to be linear (elastic) then becomes nonlinear (plastic deformation) without reaching the failure limit up to the maximum available stress (0.07 MPa). The compressive elastic modulus varies between 0.2 and 0.8 MPa with Fe addition up to 0.50. Furthermore, an approximately monotonically linear decrease in VHN with increasing Fe content up to 50% has been observed for all applied loads, which closely resembles the behavior of the true hardness and the surface energy. The magnetic measurements revealed an antiferromagnetic to paramagnetic to transition for all Fe doped samples. The Fe free sample showed paramagnetic behavior down to 2 K. The Neel temperature moderately increased from 18 K at 0.05% Fe to 25 K at 0.5% Fe. The magnetization (M) versus applied magnetic field (H) did not reach saturation for all samples up to 9 Tesla. The saturated magnetization (per Fe contents) is low and found to decreases linearly at a rate of (-35 emu/g-Fe) in a clear manifestation of the strengthening of the antiferromagnetic exchange interaction with increasing Fe contents.

Original languageEnglish
Pages (from-to)99-106
Number of pages8
JournalSuperlattices and Microstructures
Volume52
Issue number1
DOIs
StatePublished - Jul 2012

Bibliographical note

Funding Information:
We would like to thank the Deanship of Scientific Research, King Faisal University for providing facilities and maintenance support during the present project.

Keywords

  • Elastic modulus
  • Hardness
  • Neel temperature and magnetization
  • Susceptibility

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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