Influence of Cr substitution on Debye-Waller factor and related structural parameters of ZnFe2-xCrxO4 spinels

Kadhim A.M. Khalaf, A. D. Al Rawas, A. M. Gismelssed, Ahmed Al Jamel, Salwan K.J. Al Ani, M. S. Shongwe, K. O. Al Riyami, S. R. Al Alawi

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3 Citations (Scopus)

Abstract

The influence of Cr3+ ions on the Debye-Waller factor and other related structural parameters of the polycrystalline ZnFe2-xCrxO4 (0.0 ≤ x ≤ 2.0) system was characterized at room temperature using the XRD, TEM, SEM and infrared (FT-IR) spectroscopy tools. X-ray diffraction results confirm the FCC spinel structure. Values of the lattice constant ‘a’ were found to decrease from 8.4370 Å for ZnFe2O4 ferrites to 8.3208 Å for ZnCr2O4 chromates. The structure factors for the (hkl) planes were calculated and used to estimate the intensity of the X-ray diffractions and the cation distributions among the tetrahedral and octahedral sites. The Debye-Waller factors were used to estimate the Debye effective temperatures, the mean square displacements and Debye frequencies of these spinels. The FT-IR spectra were characterized by two main absorption bands υ1 and υ2 in the frequency range of (400–1000) cm−1. These bands are caused by stretching vibrations at the tetrahedral (A) and octahedral (B) sites respectively. The scanning electron microscope (SEM) and transmission electron microscope (TEM) micrographs revealed aggregates of stacked grains.

Original languageEnglish
Pages (from-to)474-486
Number of pages13
JournalJournal of Alloys and Compounds
Volume701
DOIs
Publication statusPublished - Apr 15 2017

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Keywords

  • Debye-Waller factor
  • FT-IR
  • SEM
  • Structure factor
  • TEM
  • XRD
  • ZnFeCrOspinels

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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