Influence of Zn2+ ions on the structural and electrical properties of Mg1-xZnxFeCrO4 spinels

K. A M Khalaf, A. D. Al-Rawas, H. M. Widatallah, K. S. Al-Rashdi, A. Sellai, A. M. Gismelseed, Mohd Hashim, S. K. Jameel, M. S. Al-Ruqeishi, K. O. Al-Riyami, M. Shongwe, A. H. Al-Rajhi

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The polycrystalline magnesium-zinc ferrite chromate having the chemical formula Mg1-xZnxFeCrO4 (0.0 ≤ x ≤ 1.0) were prepared by conventional solid phase reaction using high purity reagents. The structural and electrical properties at room temperature have been investigated by XRD, TEM, SEM, EDS, TGA, DTA, FT-IR and DC electrical resistivity techniques. The lattice parameters such as the lattice constant, average particle size, bonds length, density, porosity and volume shrinkage were found to vary with increasing Zn2+ content in the sample. The lattice constant "a" increases from 8.361 Å for MgFeCrO4 to 8.382 Å for ZnFeCrO4 spinels. The IR spectra confirm the presence of two main absorption bands υ1 and υ2 in the frequency range of 400-1000 cm-1, arising due to the tetrahedral (A) and octahedral (B) stretching vibrations respectively. Values of υ1 and υ2 decrease with increasing Zn+2 content over the whole composition range. The scanning electron microscope (SEM) and transmission electron microscope (TEM) micrographs showed aggregates of stacked large grains. Values of the room temperature DC electrical resistivity decrease as Zn2+ content increases. The low values of the vacancy model parameters indicate that the Mg1-xZnxFeCrO4 spinels are strongly defective and the participation of the Zn2+ vacancies in the improvement of the electrical conductivity in these spinels. The thermo-gravimetric, TGA and differential thermal analysis, DTA show loss of mass caused by vaporization of the surface and trapped water molecules at higher temperatures.

Original languageEnglish
Pages (from-to)733-747
Number of pages15
JournalJournal of Alloys and Compounds
Volume657
DOIs
Publication statusPublished - Feb 5 2016

Fingerprint

Structural properties
Electric properties
Electron microscopes
Ions
Differential thermal analysis
Lattice constants
Vacancies
Chromates
Scanning
Bond length
Vaporization
Density (specific gravity)
Temperature
Magnesium
Stretching
Ferrite
Zinc
Absorption spectra
Energy dispersive spectroscopy
Porosity

Keywords

  • DTA
  • EDS
  • IR
  • Mg-Zn-Cr spinels
  • SEM
  • TEM
  • TGA
  • Vacancy model
  • XRD

ASJC Scopus subject areas

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

Cite this

Influence of Zn2+ ions on the structural and electrical properties of Mg1-xZnxFeCrO4 spinels. / Khalaf, K. A M; Al-Rawas, A. D.; Widatallah, H. M.; Al-Rashdi, K. S.; Sellai, A.; Gismelseed, A. M.; Hashim, Mohd; Jameel, S. K.; Al-Ruqeishi, M. S.; Al-Riyami, K. O.; Shongwe, M.; Al-Rajhi, A. H.

In: Journal of Alloys and Compounds, Vol. 657, 05.02.2016, p. 733-747.

Research output: Contribution to journalArticle

Khalaf, K. A M ; Al-Rawas, A. D. ; Widatallah, H. M. ; Al-Rashdi, K. S. ; Sellai, A. ; Gismelseed, A. M. ; Hashim, Mohd ; Jameel, S. K. ; Al-Ruqeishi, M. S. ; Al-Riyami, K. O. ; Shongwe, M. ; Al-Rajhi, A. H. / Influence of Zn2+ ions on the structural and electrical properties of Mg1-xZnxFeCrO4 spinels. In: Journal of Alloys and Compounds. 2016 ; Vol. 657. pp. 733-747.
@article{8c7ef2d09b094922bbbadeddc2ea0e30,
title = "Influence of Zn2+ ions on the structural and electrical properties of Mg1-xZnxFeCrO4 spinels",
abstract = "The polycrystalline magnesium-zinc ferrite chromate having the chemical formula Mg1-xZnxFeCrO4 (0.0 ≤ x ≤ 1.0) were prepared by conventional solid phase reaction using high purity reagents. The structural and electrical properties at room temperature have been investigated by XRD, TEM, SEM, EDS, TGA, DTA, FT-IR and DC electrical resistivity techniques. The lattice parameters such as the lattice constant, average particle size, bonds length, density, porosity and volume shrinkage were found to vary with increasing Zn2+ content in the sample. The lattice constant {"}a{"} increases from 8.361 {\AA} for MgFeCrO4 to 8.382 {\AA} for ZnFeCrO4 spinels. The IR spectra confirm the presence of two main absorption bands υ1 and υ2 in the frequency range of 400-1000 cm-1, arising due to the tetrahedral (A) and octahedral (B) stretching vibrations respectively. Values of υ1 and υ2 decrease with increasing Zn+2 content over the whole composition range. The scanning electron microscope (SEM) and transmission electron microscope (TEM) micrographs showed aggregates of stacked large grains. Values of the room temperature DC electrical resistivity decrease as Zn2+ content increases. The low values of the vacancy model parameters indicate that the Mg1-xZnxFeCrO4 spinels are strongly defective and the participation of the Zn2+ vacancies in the improvement of the electrical conductivity in these spinels. The thermo-gravimetric, TGA and differential thermal analysis, DTA show loss of mass caused by vaporization of the surface and trapped water molecules at higher temperatures.",
keywords = "DTA, EDS, IR, Mg-Zn-Cr spinels, SEM, TEM, TGA, Vacancy model, XRD",
author = "Khalaf, {K. A M} and Al-Rawas, {A. D.} and Widatallah, {H. M.} and Al-Rashdi, {K. S.} and A. Sellai and Gismelseed, {A. M.} and Mohd Hashim and Jameel, {S. K.} and Al-Ruqeishi, {M. S.} and Al-Riyami, {K. O.} and M. Shongwe and Al-Rajhi, {A. H.}",
year = "2016",
month = "2",
day = "5",
doi = "10.1016/j.jallcom.2015.10.157",
language = "English",
volume = "657",
pages = "733--747",
journal = "Journal of Alloys and Compounds",
issn = "0925-8388",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Influence of Zn2+ ions on the structural and electrical properties of Mg1-xZnxFeCrO4 spinels

AU - Khalaf, K. A M

AU - Al-Rawas, A. D.

AU - Widatallah, H. M.

AU - Al-Rashdi, K. S.

AU - Sellai, A.

AU - Gismelseed, A. M.

AU - Hashim, Mohd

AU - Jameel, S. K.

AU - Al-Ruqeishi, M. S.

AU - Al-Riyami, K. O.

AU - Shongwe, M.

AU - Al-Rajhi, A. H.

PY - 2016/2/5

Y1 - 2016/2/5

N2 - The polycrystalline magnesium-zinc ferrite chromate having the chemical formula Mg1-xZnxFeCrO4 (0.0 ≤ x ≤ 1.0) were prepared by conventional solid phase reaction using high purity reagents. The structural and electrical properties at room temperature have been investigated by XRD, TEM, SEM, EDS, TGA, DTA, FT-IR and DC electrical resistivity techniques. The lattice parameters such as the lattice constant, average particle size, bonds length, density, porosity and volume shrinkage were found to vary with increasing Zn2+ content in the sample. The lattice constant "a" increases from 8.361 Å for MgFeCrO4 to 8.382 Å for ZnFeCrO4 spinels. The IR spectra confirm the presence of two main absorption bands υ1 and υ2 in the frequency range of 400-1000 cm-1, arising due to the tetrahedral (A) and octahedral (B) stretching vibrations respectively. Values of υ1 and υ2 decrease with increasing Zn+2 content over the whole composition range. The scanning electron microscope (SEM) and transmission electron microscope (TEM) micrographs showed aggregates of stacked large grains. Values of the room temperature DC electrical resistivity decrease as Zn2+ content increases. The low values of the vacancy model parameters indicate that the Mg1-xZnxFeCrO4 spinels are strongly defective and the participation of the Zn2+ vacancies in the improvement of the electrical conductivity in these spinels. The thermo-gravimetric, TGA and differential thermal analysis, DTA show loss of mass caused by vaporization of the surface and trapped water molecules at higher temperatures.

AB - The polycrystalline magnesium-zinc ferrite chromate having the chemical formula Mg1-xZnxFeCrO4 (0.0 ≤ x ≤ 1.0) were prepared by conventional solid phase reaction using high purity reagents. The structural and electrical properties at room temperature have been investigated by XRD, TEM, SEM, EDS, TGA, DTA, FT-IR and DC electrical resistivity techniques. The lattice parameters such as the lattice constant, average particle size, bonds length, density, porosity and volume shrinkage were found to vary with increasing Zn2+ content in the sample. The lattice constant "a" increases from 8.361 Å for MgFeCrO4 to 8.382 Å for ZnFeCrO4 spinels. The IR spectra confirm the presence of two main absorption bands υ1 and υ2 in the frequency range of 400-1000 cm-1, arising due to the tetrahedral (A) and octahedral (B) stretching vibrations respectively. Values of υ1 and υ2 decrease with increasing Zn+2 content over the whole composition range. The scanning electron microscope (SEM) and transmission electron microscope (TEM) micrographs showed aggregates of stacked large grains. Values of the room temperature DC electrical resistivity decrease as Zn2+ content increases. The low values of the vacancy model parameters indicate that the Mg1-xZnxFeCrO4 spinels are strongly defective and the participation of the Zn2+ vacancies in the improvement of the electrical conductivity in these spinels. The thermo-gravimetric, TGA and differential thermal analysis, DTA show loss of mass caused by vaporization of the surface and trapped water molecules at higher temperatures.

KW - DTA

KW - EDS

KW - IR

KW - Mg-Zn-Cr spinels

KW - SEM

KW - TEM

KW - TGA

KW - Vacancy model

KW - XRD

UR - http://www.scopus.com/inward/record.url?scp=84945569058&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84945569058&partnerID=8YFLogxK

U2 - 10.1016/j.jallcom.2015.10.157

DO - 10.1016/j.jallcom.2015.10.157

M3 - Article

AN - SCOPUS:84945569058

VL - 657

SP - 733

EP - 747

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

ER -