Sr1-xLaxFe12O19 (0.0?x?0.5) hexaferrites: Synthesis, characterizations, hyperfine interactions and magneto-optical properties

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dc.contributor.authorAuwal, İsmail A.
dc.contributor.authorGüner, Sadık
dc.contributor.authorGüngüneş, Hakan
dc.contributor.authorBaykal, Abdulhadi
dc.date.accessioned2019-05-10T09:40:01Z
dc.date.available2019-05-10T09:40:01Z
dc.date.issued2016
dc.departmentHitit Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü
dc.description.abstractA simple sol-gel auto combustion process was used to synthesize La3+ substituted M-type strontium hexaferrite, Sr1-xLaxFe12-xO19 (0.0?x? 0.5). Structural, magnetic, and optical behavior as a function of La3+ substitutions were investigated by Fourier transformed infrared spectroscopy (FT-IR). X-ray powder diffraction (XRD). Scanning electron microscopy (SEM), Mössbauer spectroscopy, vibrating sample magnetometer (VSM), and Diffuse reflectance spectroscopy (DRS). XRD data showed single phase magnetoplumbite structure and Rietveld analysis confirmed P63/mmc space group for all the series. The average crystallite size was found to be in the range of 43.2–48.4 nm. The variation in line width, isomer shift, quadrupole splitting, relative area and hyperfine magnetic field values have been determined from 57Fe Mössbauer spectroscopy data. The fittings accounted for the Fe2+/Fe3+ charge compensation mechanism at the 2a site due to replacement of Sr2+ by La3+. The saturation magnetization (?s) decreases from 57,21 to 63,23 emu/g and remnant magnetization (?r) decreases from 35.6 emu/g to 28.7 emu/g with increasing La substitution. The decrement is sharper at coercive field (Hc) from maximum value of 5325 to minimum 1825 Oe. Demagnetizing factor (N) is 3 times more for the x=0.3, 0.4, and 0.5. However all samples exhibit ferromagnetic behavior at room temperature. Magnetic anisotropy of Hexaferrites was detected as uniaxial and effective anisotropy constants (Keff) were between 5.93×105 and 4.76×105 Ergs/g. The high magnitudes of anisotropy fields (Ha) in the range of 13863–15574 Oe reveal that all hexaferrites are magnetic hard materials. Tauc plots were applied to extrapolate the direct optical energy band gap (Eg) of hexaferrites. The Eg values decreased from 1.83 to 1.34 eV with increasing La content.
dc.identifier.citationAuwal, I. A., Güner, S., Güngüneş, H., Baykal, A. (2016). Sr1-xLaxFe12O19 (0.0? x? 0.5) hexaferrites: synthesis, characterizations, hyperfine interactions and magneto-optical properties. Ceramics International, 42(11), 12995-13003.
dc.identifier.doi10.1016/j.ceramint.2016.05.074
dc.identifier.endpage13003en_US
dc.identifier.issn0272-8842
dc.identifier.issue11en_US
dc.identifier.scopusqualityQ1
dc.identifier.startpage12995en_US
dc.identifier.urihttps://doi.org/10.1016/j.ceramint.2016.05.074
dc.identifier.urihttps://hdl.handle.net/11491/827
dc.identifier.volume42en_US
dc.identifier.wosqualityN/A
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier Ltd
dc.relation.ispartofCeramics International
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectCoercive Fielden_US
dc.subjectHexaferritesen_US
dc.subjectHyperfine Interactionsen_US
dc.subjectMössbauer Analysisen_US
dc.subjectOptical Propertiesen_US
dc.titleSr1-xLaxFe12O19 (0.0?x?0.5) hexaferrites: Synthesis, characterizations, hyperfine interactions and magneto-optical properties
dc.typeArticle

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