The influence of pH value and composition on the microstructure, magnetic properties of Co-Fe-Al Heusler nanoparticles

Yang, Fujun; Min, J.J.; Kang, Zewei; Tu, S.Y.; Chen, H.B.; Liu, D.G.; Li, W.J.; Yang, Changping

doi:10.1016/j.cplett.2016.12.062

Cited by 15 publications

(7 citation statements)

References 28 publications

(35 reference statements)

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“…As seen previously in the “Microstructural analysis” section, the microstructure of SrFe 12 O 19 was affected by increasing the pH value. This is in agreement with the findings reported by Yang et al [31], where the particles became larger [32] with the increase of pH from 5 to 11. The larger particles were highly affected by strong magnetic interaction between magnetic atoms of Fe in the grains [33].…”

Section: Resultssupporting

confidence: 94%

Influence of pH Adjustment Parameter for Sol–Gel Modification on Structural, Microstructure, and Magnetic Properties of Nanocrystalline Strontium Ferrite

et al. 2018

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Synthesis of nanocrystalline strontium ferrite (SrFe12O19) via sol–gel is sensitive to its modification parameters. Therefore, in this study, an attempt of regulating the pH as a sol–gel modification parameter during preparation of SrFe12O19 nanoparticles sintered at a low sintering temperature of 900 °C has been presented. The relationship of varying pH (pH 0 to 8) on structural, microstructures, and magnetic behaviors of SrFe12O19 nanoparticles were characterized by X-ray diffraction (XRD), field emission scanning microscope (FESEM), and vibrating sample magnetometer (VSM). Varying the pH of precursor exhibited a strong effect on the sintered density, crystal structure and magnetic properties of the SrFe12O19 nanoparticles. As the pH is 0, the SrFe12O19 produced relatively largest density, saturation magnetization, Ms, and coercivity, Hc, at a low sintering temperature of 900 °C. The grain size of SrFe12O19 is obtained in the range of 73.6 to 133.3 nm. The porosity of the sample affected the density and the magnetic properties of the SrFe12O19 ferrite. It is suggested that the low-temperature sintered SrFe12O19 at pH 0 displayed Ms of 44.19 emu/g and Hc of 6403.6 Oe, possessing a significant potential for applying in low-temperature co-fired ceramic permanent magnet.

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Section: Resultssupporting

confidence: 94%

Influence of pH Adjustment Parameter for Sol–Gel Modification on Structural, Microstructure, and Magnetic Properties of Nanocrystalline Strontium Ferrite

et al. 2018

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“…The microstructures of nanoparticles were affected by the increase of pH value. This is in agreement with findings reported by Yang et al [36], where the formation of particles became larger [37] with the increase of pH from 5 to 11. This is due to the aggregation of small particle that occurs when there is a strong magnetic interaction between magnetic atoms (Fe or Co) containing in Co-Fe-Al grains as the composition of Co increases and the composition of Al decreases [38].…”

Section: Magnetic Behaviorssupporting

confidence: 94%

Dependence of pH Variation on the Structural, Morphological, and Magnetic Properties of Sol-Gel Synthesized Strontium Ferrite Nanoparticles

Mustaffa¹,

Azis²,

SakinahSulaiman³

2019

Sol-Gel Method - Design and Synthesis of New Materials With Interesting Physical, Chemical and Biological Properties

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In this research work, an attempt of regulating the pH as a sol-gel modification parameter during preparation of SrFe 12 O 19 nanoparticles sintered at a low sintering temperature of 900 C has been presented. The relationship of varying pH (pH 1-14) on structural microstructures and magnetic behaviors of SrFe 12 O 19 nanoparticles was characterized by X-ray diffraction (XRD), field emission scanning microscope (FESEM), thermogravimetric analysis (TGA), Fourier-transform infrared (FTIR), and vibrating-sample magnetometer (VSM). The single-phase SrFe 2 O 19 with optimum magnetic properties can be obtained at pH 1 with a sintering temperature of 900 C. As pH values increase, the presence of impurity Fe 2 O 3 was observed. TGA data-varying pH shows that the total weight loss of most samples was at 30.44% which corresponds to the decomposition process. The IR spectra showed three main absorption bands in the range of 400-600 cm À1 corresponding to strontium hexaferrite. SEM micrographs exhibit a circular crystal type of strontium ferrite with an average crystal size in the range of 53-133 nm. A higher saturation magnetization M s , remanent magnetization M r , and hysteresis H c were recorded to have a large loop of 55.094 emu/g, 33.995 emu/g, and 5357.6 Oe, respectively, at pH 11, which make the synthesized materials useful for high-density recording media and permanent magnets.

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“…The authors have studied the effect of different pH values on the structural and magnetic properties, when preparing the Co-Fe-Al nanoparticles in a solution of water and NaOH. For a pH value of 7.0 small particle size with B2 ordering was observed, which did exhibit a high saturation magnetization and a low coercivity [24].…”

Section: Introductionmentioning

confidence: 98%

“…[20,22,23] have used fumed silica powder as template for preparing nanoparticles. Alternatively, another simple and effective co-precipitation route for preparing Heusler alloy nanoparticles has been reported recently by Yang et al [24]. The authors have studied the effect of different pH values on the structural and magnetic properties, when preparing the Co-Fe-Al nanoparticles in a solution of water and NaOH.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the structural, electronic, transport and magnetic properties of Co2FeGa Heusler alloy nanoparticles

Nehla

Ulrich

Dhaka

2019

Journal of Alloys and Compounds

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We report the structural, transport, electronic, and magnetic properties of Co2FeGa Heusler alloy nanoparticles. The Rietveld refinements of x-ray diffraction (XRD) data with the space group Fm3m clearly demonstrates that the nanoparticles are of single phase. The particle size (D) decreases with increasing the SiO2 concentration. The Bragg peak positions and the inter-planer spacing extracted from high-resolution transmission electron microscopy image and selected area electron diffraction are in well agreement with data obtained from XRD. The coercivity initially increases from 127 Oe to 208 Oe between D = 8.5 nm and 12.5 nm, following the D −3/2 dependence and then decreases with further increasing D up to 21.5 nm with a D −1 dependence, indicating the transition from single domain to multidomain regime. The effective magnetic anisotropic constant behaves similarly as coercivity, which confirms this transition. A complex scattering mechanisms have been fitted to explain the electronic transport properties of these nanoparticles. In addition we have studied corelevel and valence band spectra using photoemission spectroscopy, which confirm the hybridization between d states of Co/Fe. Further nanoparticle samples synthesized by co-precipitation method show higher saturation magnetization. The presence of Raman active modes can be associated with the high chemical ordering, which motivates for detailed temperature dependent structural investigation using synchrotron radiation and neutron sources.

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The influence of pH value and composition on the microstructure, magnetic properties of Co-Fe-Al Heusler nanoparticles

Cited by 15 publications

References 28 publications

Influence of pH Adjustment Parameter for Sol–Gel Modification on Structural, Microstructure, and Magnetic Properties of Nanocrystalline Strontium Ferrite

Influence of pH Adjustment Parameter for Sol–Gel Modification on Structural, Microstructure, and Magnetic Properties of Nanocrystalline Strontium Ferrite

Dependence of pH Variation on the Structural, Morphological, and Magnetic Properties of Sol-Gel Synthesized Strontium Ferrite Nanoparticles

Investigation of the structural, electronic, transport and magnetic properties of Co2FeGa Heusler alloy nanoparticles

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