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    Corrigendum to “The effect of Nb substitution on magnetic properties of BaFe12O19 nanohexaferrites” [Ceram. Int. 45 (2019) 1691–1697](S027288421832844X)(10.1016/j.ceramint.2018.10.048)
    (Elsevier Ltd, 2019) Almessiere, Munirah Abdullah; Slimani, Yassine; Tashkandi ,Na Tashkandi; Baykal, Abdulhadi; Saraç, Mehmet Fahri; Belenli, İbrahim
    The authors regret that in the published version of this article two additional affiliation addresses were missing for the author A.V. Trukhanov. The affiliation additional addresses are: National University of Science and Technology MISiS, 119049, Moscow, Leninsky Prospekt, 4, Russia South Ural State University, 454080, Chelyabinsk, Lenin Prospect, 76, Russia The authors would like to apologise for any inconvenience caused. © 2018 Elsevier Ltd and Techna Group S.r.l.
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    The effect of Nb substitution on magnetic properties of BaFe12O19 nanohexaferrites
    (Elsevier Ltd, 2019) Almessiere, Munirah Abdullah; Slimani, Yassine; Tashkandi ,Na Tashkandi; Baykal, Abdulhadi; Saraç, Mehmet Fahri; Belenli, İbrahim
    Microstructural and magnetic properties of BaFe12-xNbxO19 (0.0 ? x ? 0.1) nanohexaferrites (NHFs) have been investigated intensively in this work. The Ba NHFs are synthesized through sol-gel auto-combustion route. The formation of single phase Ba NHFs, in different samples are confirmed by XRD powder patterns, scanning electron microscopy and Fourier Transform Infrared spectroscopy. The magnetic properties of BaFe12-xNbxO19 (0.0 ? x ? 0.1) NHFs were performed at room and low temperatures and discussed in detail. The analysis of hysteresis loops divulged that the different products display hard ferromagnetic behavior at different temperatures. The deduced values of saturation magnetization (Ms), remanence (Mr), magneton number (nB) and magneto crystalline anisotropy constant (Keff) are reduced for lower Nb content and then increased with further increasing the Nb content, reaching a maximum values for BaFe11.9Nb0.1O19 (x = 0.1) nanohexaferrite. The coercivity (Hc) and intrinsic coercivity (Hci) are diminished for lower x and are comparable to that of pristine one for higher x. The squareness ratio (Mr/Ms) are fluctuating between 0.50 and 0.55, implying the uniaxial anisotropy for different BaFe12-xNbxO19 nanohexaferrite. © 2018 Elsevier Ltd and Techna Group S.r.l.
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    Magnetic and structural characterization of Nb 3+ -substituted CoFe 2 O 4 nanoparticles
    (Elsevier Ltd, 2019) Almessiere, Munirah Abdullah; Slimani, Yassine; Güner, Sait Barış; Nawaz, Muhammed; Belenli, İbrahim
    This study investigated the effect of Nb 3+ substitution on the magnetic and structural properties of CoFe 2 O 4 nanoparticles (NPs) synthesized by hydrothermal approach. The formation of a single phase of spinel ferrite was confirmed through X-ray powder diffraction, and crystallite sizes in the range 18–30 nm were observed. Moreover, it found that the Fourier transform infrared (FT-IR) spectra of the NPs included the main vibration bands of the spinel structure. The partially cubic structure was confirmed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The energy band gaps for CoNb x Fe 2-x O 4 were estimated to be in the range 0.48–0.53 eV for Nb 3+ content x = 0.0–0.10. Magnetization measurements at room temperature (RT; 300 K) and at 10 K were performed on spinel CoNb x Fe 2-x O 4 (0.00 ? x ? 0.10) NPs using a vibrating sample magnetometer (VSM). Nb 3+ doping significantly changed the magnetization and coercivity of the Co ferrite samples. RT hysteresis curves indicated well-defined ferrimagnetic behavior for all prepared NPs with saturation magnetization (M s ) in the range 44.45 – 49.40 emu/g and remanent magnetization (M r ) in the range 12.16 – 17.90 emu/g. The coercive field (H c ) is found to be equal 936 Oe and is decreased with Nb 3+ substitutions. However, hysteresis curves at 10 K showed finite remanent specific magnetization (1.90–6.70 emu/g) but significant asymmetric coercivity (715–2810 Oe), particularly for the Nb 3+ -doped samples. At 10 K, the magnetization values were 4–6 times smaller but symmetric coercivity field values were 2–3 times larger compared with the RT-VSM curves. The obtained magnetic parameters indicated the semi-hard magnetic character of the Co ferrite samples at low temperatures. © 2019 Elsevier Ltd and Techna Group S.r.l.