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dc.contributor.authorHeiba, Zein K.
dc.contributor.authorMohamed, Mohamed Bakr
dc.contributor.authorAhmed, M. A.
dc.contributor.authorMoussa, M. A. A.
dc.contributor.authorHamdeh, Hussein H.
dc.date.accessioned2014-02-13T17:16:55Z
dc.date.available2014-02-13T17:16:55Z
dc.date.issued2014-02-16
dc.identifier.citationHeiba, Zein K.; Mohamed, Mohamed Bakr; Ahmed, M. A.; Moussa, M. A. A.; Hamdeh, Hussein H. 2014. Cation distribution and dielectric properties of nanocrystalline gallium substituted nickel ferrite. Journal of Alloys and Compounds, vol. 586:ppg. 773–781en_US
dc.identifier.issn0925-8388
dc.identifier.otherWOS:000329856800124
dc.identifier.urihttp://dx.doi.org/10.1016/j.jallcom.2013.10.137
dc.identifier.urihttp://hdl.handle.net/10057/7071
dc.descriptionClick on the DOI link to access the article (may not be free).en_US
dc.description.abstractNano crystalline NiFe2−xGaxO4, 0.0 ⩽ x ⩽ 1 ferrite was prepared by citrate method. The structural and micro structural evolutions of the nanophase have been studied using X-ray powder diffraction and the Rietveld method. The refinement result showed that the type of the cationic distribution over the tetrahedral and octahedral sites in the nanocrystalline lattice is partially an inverse spinel. Furthermore, the Mössbauer spectra, measured at 20 K of all the samples show complete magnetic behavior, whereas at room temperature, are combination of ferromagnetic and superparamagnetic components indicating the particle size dependency. The inversion of Ni ions in a sample is affected by the percentage of Ga ions present, consistent with the results of X-ray data analysis. The a.c conductivity was measured in the temperature range 77–493 K and frequency range 50–100 kHz. The dielectric constant increase with increase Ga amount. The a.c conductivity results showed that nanocrystalline Ga doped NiFe2O4 ferrite samples follow the correlated barrier hopping (CBH) model. The activation energy increases from1.2 to 1.8 eV as the amount of Ga increases.en_US
dc.language.isoen_USen_US
dc.publisherElsevier B.V.en_US
dc.relation.ispartofseriesJournal of Alloys and Compounds;v.586
dc.subjectNickel nanoferriteen_US
dc.subjectGallium substituted nickel spinelen_US
dc.subjectDielectricen_US
dc.subjectRietvelden_US
dc.subjectMössbaueren_US
dc.subjectCations distributionen_US
dc.titleCation distribution and dielectric properties of nanocrystalline gallium substituted nickel ferriteen_US
dc.typeArticleen_US


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