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Effects of Zn Substitution on Structure Factors, Debye-Waller Factors and Related Structural Properties of the Mg1-xZnxFeNiO4 Spinels

Received: 7 January 2019     Accepted: 24 May 2019     Published: 10 June 2019
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Abstract

The effects of Zn2+ ions substitutions on the Debye-Waller Factors, structure factor and other related structural properties of the Mg1-xZnxNiFeO4 (where 0.0≤x≤1.0) spinels have been investigated using the XRD, TEM, SEM and FT-IR tools. The Mg1-xZnxNiFeO4 samples were prepared using the conventional ceramic solid state sintering techniques at temperatures around 1100°C. The Mg1-xZnxNiFeO4 spinels have predominantly inverse type structure with inversion factor, λ in the range 0.69 to 0.36. The X-ray diffraction (XRD) patterns of all compositions showed the formation of cubic spinel structure. The lattice constant “a” increases from 8.3397Å for MgFeNiO4 to 8.3855Å for ZnFeNiO4 spinels. The increases in lattice parameters have been attributed to the replacement of small Mg2+ ions (0.66 Å) with the Zn2+ (0.74 Å) ions of a larger ionic radius. The IR spectra confirm the existence 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 both υ1 and υ2 decrease as Zn content increases. The scanning electron microscope (SEM) and transmission electron microscope (TEM) images showed aggregates of stacked grains. The normalized XRD intensities of the main (hkl) planes were used in the estimation of the Debye-Waller factor. Values of the Debye-Waller factors were estimated to be in the range (0.77-1.44A2). The calculated and observed relative intensities and areas of the most related plains to cation distributions (i.e.: the (220), (311), (222), (400), (422), (511) and (440) plains) were obtained by normalizing with respect to the most intensive reflection from the (311) plane. An inverse relation between the ordering, Q and inversion, λ factors exists in these partially inverse spinels. Both Q and λ decrease as Zn content (x) increases in the sample. The cation distributions indicate that the sample, MgFeNiO4 with x=0, λ=2/3 and maximum configurational entropy Sc(=15.876 J/mol, K) should represents the sample of the complete randomness of cation distributions in these spinels and can be written as (Mg1/3Fe2/3)[Mg2/3Fe1/3Ni3/3)O4. In general the variation of the different structural parameters with Zn content lie on two different regions, the first region for x values (0.0-0.6) the “highly normal” and the second region for x values (0.6-1.0) the “highly inverse” type structure.

Published in Advances in Materials (Volume 8, Issue 2)
DOI 10.11648/j.am.20190802.15
Page(s) 70-93
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2019. Published by Science Publishing Group

Keywords

XRD, TEM, SEM, FTIR, Structure Factor, Debye Waller Factor, Order Parameter

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    Kadhim Ahmed Khalaf, Ahmed Al-Rawas, Abbasher Gismelseed, Majid Al-Ruqeishi, Salwan Al-Ani, et al. (2019). Effects of Zn Substitution on Structure Factors, Debye-Waller Factors and Related Structural Properties of the Mg1-xZnxFeNiO4 Spinels. Advances in Materials, 8(2), 70-93. https://doi.org/10.11648/j.am.20190802.15

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    Kadhim Ahmed Khalaf; Ahmed Al-Rawas; Abbasher Gismelseed; Majid Al-Ruqeishi; Salwan Al-Ani, et al. Effects of Zn Substitution on Structure Factors, Debye-Waller Factors and Related Structural Properties of the Mg1-xZnxFeNiO4 Spinels. Adv. Mater. 2019, 8(2), 70-93. doi: 10.11648/j.am.20190802.15

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    Kadhim Ahmed Khalaf, Ahmed Al-Rawas, Abbasher Gismelseed, Majid Al-Ruqeishi, Salwan Al-Ani, et al. Effects of Zn Substitution on Structure Factors, Debye-Waller Factors and Related Structural Properties of the Mg1-xZnxFeNiO4 Spinels. Adv Mater. 2019;8(2):70-93. doi: 10.11648/j.am.20190802.15

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  • @article{10.11648/j.am.20190802.15,
      author = {Kadhim Ahmed Khalaf and Ahmed Al-Rawas and Abbasher Gismelseed and Majid Al-Ruqeishi and Salwan Al-Ani and Ahmad Al-Jubouri and Khamis Al-Ryami and Bushra Al-Jaddedi},
      title = {Effects of Zn Substitution on Structure Factors, Debye-Waller Factors and Related Structural Properties of the Mg1-xZnxFeNiO4 Spinels},
      journal = {Advances in Materials},
      volume = {8},
      number = {2},
      pages = {70-93},
      doi = {10.11648/j.am.20190802.15},
      url = {https://doi.org/10.11648/j.am.20190802.15},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.am.20190802.15},
      abstract = {The effects of Zn2+ ions substitutions on the Debye-Waller Factors, structure factor and other related structural properties of the Mg1-xZnxNiFeO4 (where 0.0≤x≤1.0) spinels have been investigated using the XRD, TEM, SEM and FT-IR tools. The Mg1-xZnxNiFeO4 samples were prepared using the conventional ceramic solid state sintering techniques at temperatures around 1100°C. The Mg1-xZnxNiFeO4 spinels have predominantly inverse type structure with inversion factor, λ in the range 0.69 to 0.36. The X-ray diffraction (XRD) patterns of all compositions showed the formation of cubic spinel structure. The lattice constant “a” increases from 8.3397Å for MgFeNiO4 to 8.3855Å for ZnFeNiO4 spinels. The increases in lattice parameters have been attributed to the replacement of small Mg2+ ions (0.66 Å) with the Zn2+ (0.74 Å) ions of a larger ionic radius. The IR spectra confirm the existence 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 both υ1 and υ2 decrease as Zn content increases. The scanning electron microscope (SEM) and transmission electron microscope (TEM) images showed aggregates of stacked grains. The normalized XRD intensities of the main (hkl) planes were used in the estimation of the Debye-Waller factor. Values of the Debye-Waller factors were estimated to be in the range (0.77-1.44A2). The calculated and observed relative intensities and areas of the most related plains to cation distributions (i.e.: the (220), (311), (222), (400), (422), (511) and (440) plains) were obtained by normalizing with respect to the most intensive reflection from the (311) plane. An inverse relation between the ordering, Q and inversion, λ factors exists in these partially inverse spinels. Both Q and λ decrease as Zn content (x) increases in the sample. The cation distributions indicate that the sample, MgFeNiO4 with x=0, λ=2/3 and maximum configurational entropy Sc(=15.876 J/mol, K) should represents the sample of the complete randomness of cation distributions in these spinels and can be written as (Mg1/3Fe2/3)[Mg2/3Fe1/3Ni3/3)O4. In general the variation of the different structural parameters with Zn content lie on two different regions, the first region for x values (0.0-0.6) the “highly normal” and the second region for x values (0.6-1.0) the “highly inverse” type structure.},
     year = {2019}
    }
    

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  • TY  - JOUR
    T1  - Effects of Zn Substitution on Structure Factors, Debye-Waller Factors and Related Structural Properties of the Mg1-xZnxFeNiO4 Spinels
    AU  - Kadhim Ahmed Khalaf
    AU  - Ahmed Al-Rawas
    AU  - Abbasher Gismelseed
    AU  - Majid Al-Ruqeishi
    AU  - Salwan Al-Ani
    AU  - Ahmad Al-Jubouri
    AU  - Khamis Al-Ryami
    AU  - Bushra Al-Jaddedi
    Y1  - 2019/06/10
    PY  - 2019
    N1  - https://doi.org/10.11648/j.am.20190802.15
    DO  - 10.11648/j.am.20190802.15
    T2  - Advances in Materials
    JF  - Advances in Materials
    JO  - Advances in Materials
    SP  - 70
    EP  - 93
    PB  - Science Publishing Group
    SN  - 2327-252X
    UR  - https://doi.org/10.11648/j.am.20190802.15
    AB  - The effects of Zn2+ ions substitutions on the Debye-Waller Factors, structure factor and other related structural properties of the Mg1-xZnxNiFeO4 (where 0.0≤x≤1.0) spinels have been investigated using the XRD, TEM, SEM and FT-IR tools. The Mg1-xZnxNiFeO4 samples were prepared using the conventional ceramic solid state sintering techniques at temperatures around 1100°C. The Mg1-xZnxNiFeO4 spinels have predominantly inverse type structure with inversion factor, λ in the range 0.69 to 0.36. The X-ray diffraction (XRD) patterns of all compositions showed the formation of cubic spinel structure. The lattice constant “a” increases from 8.3397Å for MgFeNiO4 to 8.3855Å for ZnFeNiO4 spinels. The increases in lattice parameters have been attributed to the replacement of small Mg2+ ions (0.66 Å) with the Zn2+ (0.74 Å) ions of a larger ionic radius. The IR spectra confirm the existence 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 both υ1 and υ2 decrease as Zn content increases. The scanning electron microscope (SEM) and transmission electron microscope (TEM) images showed aggregates of stacked grains. The normalized XRD intensities of the main (hkl) planes were used in the estimation of the Debye-Waller factor. Values of the Debye-Waller factors were estimated to be in the range (0.77-1.44A2). The calculated and observed relative intensities and areas of the most related plains to cation distributions (i.e.: the (220), (311), (222), (400), (422), (511) and (440) plains) were obtained by normalizing with respect to the most intensive reflection from the (311) plane. An inverse relation between the ordering, Q and inversion, λ factors exists in these partially inverse spinels. Both Q and λ decrease as Zn content (x) increases in the sample. The cation distributions indicate that the sample, MgFeNiO4 with x=0, λ=2/3 and maximum configurational entropy Sc(=15.876 J/mol, K) should represents the sample of the complete randomness of cation distributions in these spinels and can be written as (Mg1/3Fe2/3)[Mg2/3Fe1/3Ni3/3)O4. In general the variation of the different structural parameters with Zn content lie on two different regions, the first region for x values (0.0-0.6) the “highly normal” and the second region for x values (0.6-1.0) the “highly inverse” type structure.
    VL  - 8
    IS  - 2
    ER  - 

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Author Information
  • Department of Mathematical and Physical Sciences, College of Arts and Sciences, University of Nizwa, Nizwa, Oman

  • Department of Physics, College of Science, Sultan Qaboos University, Al-koud, Oman

  • Department of Physics, College of Science, Sultan Qaboos University, Al-koud, Oman

  • Department of Physics, College of Science, Sultan Qaboos University, Al-koud, Oman

  • Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq

  • Department of Mathematical and Physical Sciences, College of Arts and Sciences, University of Nizwa, Nizwa, Oman

  • Department of Mathematical and Physical Sciences, College of Arts and Sciences, University of Nizwa, Nizwa, Oman

  • Department of Mathematical and Physical Sciences, College of Arts and Sciences, University of Nizwa, Nizwa, Oman

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