Structural, optical and magnetic properties of nanocrystalline zinc ferrite particles from glycine assisted combustion: Effect of Sr<sup>2+</sup> dopant

Ramachandran, Tholkappiyan; Vishista, K.

doi:10.3139/146.111161

Cited by 17 publications

(8 citation statements)

References 58 publications

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“…as a function of Ru doping in the Sr 2 YbTaO 6 system which definitely shows that the Ru doping does not affect the A ion of the double perovskite with electronic interaction for this system. The Sr 2+ possesses no unpaired electron and is therefore magnetically not active, as has been earlier shown by the Sr 2+ -doped zinc ferrite nanoparticles and decrease of the magnetic ordering by Sr 2+ -doping in LaCrO 3 …”

Section: Resultsmentioning

confidence: 69%

Investigation of Photoelectrocatalytic and Magnetic Properties of Sr₂YbRu_1–xTa_xO₆ (x = 0, 0.25, 0.5, 0.75, and 1)

et al. 2023

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We report the effect of substitution of Ru by Ta in Sr 2 YbRuO 6 on its magnetic and photoelectrocatalytic properties. The powder X-ray diffraction data, was satisfactorily refined in the monoclinic space group, P2 1 /n. The DC magnetization studies indicated that Sr 2 YbRuO 6 shows antiferromagnetic interaction through Yb−O−Ru orbital ordering, with the highest Weiss temperature, among Sr 2 YbRu 1−x Ta x O 6 (x = 0, 0.25, 0.5, and 0.75) which have values of −148, −125, −118, and −102 K, respectively. The difference in observed and theoretical magnetic moments was found to increase as x increases. It was also observed that with the increase of Ta concentration in Sr 2 YbRu 1−x Ta x O 6 , the band gap increased almost linearly, from 1.78(1) eV (x = 0) to 2.08(1) (x = 0.75), and thereafter a sharp increase 2.65(1) eV (x = 1) was observed, with the lowering of energy level of valence band, along with disruption in orbital ordering as x increases. The photoelectrocatalytic oxygen evolution reaction (OER) studies carried out on the series yield a maximum photocurrent density of 17 μA/cm 2 and photoresponse current of 5.5 μA/cm 2 at 0.8 V at an onset potential at 0.29 V vs Ag/AgCl for Sr 2 YbRuO 6 . The XPS analysis showed Ta and Ru to be in +5/+4 oxidation states, with the highest concentration of Ru 4+ ion observed for Sr 2 YbRuO 6 . The presence of oxygen vacancies was confirmed by XPS as well as EPR studies.Article pubs.acs.org/IC

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Section: Resultsmentioning

confidence: 69%

Investigation of Photoelectrocatalytic and Magnetic Properties of Sr₂YbRu_1–xTa_xO₆ (x = 0, 0.25, 0.5, 0.75, and 1)

et al. 2023

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“…The Fe on the chalcopyrite surface existed mainly in the forms of CuFeS 2 and FeO-OH, as shown in Figure 8b. The existence of Fe 3+ sites in chalcopyrite was confirmed around 719 eV [44,45]. After the CMC treatment, the peak at 719 eV disappeared, indicating that Fe 3+ had reacted with the CMC.…”

Section: Ftir Analysismentioning

confidence: 83%

An Alternative Depressant of Chalcopyrite in Cu–Mo Differential Flotation and Its Interaction Mechanism

et al. 2018

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Carboxymethylcellulose (CMC) is a nontoxic and biodegradable polysaccharide, which can potentially replace the frequently used hazardous depressants in Cu-Mo separation. However, a lack of understanding of the interaction mechanism between the CMC and the minerals has hindered its application. In the present study, it is found that 50 mg·L −1 CMC can inhibit chalcopyrite entirely in the pH range 4-6, while having little effect on molybdenite. The results also showed that the inhibition effect of the depressant for chalcopyrite enhanced with the increase of the degree of substitution (DS) and molecular weight (M w ) of CMC. The low DS and high M w of CMC were detrimental to the Cu-Mo separation flotation. Furthermore, CMC adsorption was found to be favored by a positive zeta potential but hindered by the protonation of the carboxyl groups. An electrochemical study showed that CMC inhibited 92.9% of the electrochemical reaction sites of chalcopyrite and greatly reduced the production of hydrophobic substances. The XPS and FTIR measurements displayed that the chemisorption was mainly caused by Fe 3+ on the chalcopyrite surface and the carboxyl groups in the CMC molecular structure. Minerals 2019, 9, 1 2 of 11 polysaccharides as a chalcopyrite depressant in Cu-Mo separation flotation, including ATDT [23], DMTC [24], tannin [25], chitosan [26], and so on. Carboxymethylcellulose (CMC), a natural polysaccharide which is widely used as a talc depressant and food additive [27][28][29], might be suitable for this purpose. CMC is known to inhibit chalcopyrite under certain conditions [30,31]. However, the interaction mechanism between CMC and the chalcopyrite surface has rarely been investigated. The general interaction between polysaccharides and sulfide ores is highly controversial and needs resolving in many further studies. The present study assessed the efficiency of CMC as a depressant of chalcopyrite in Cu-Mo differential flotation and elucidated the underlying interaction mechanism.

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“…The absorption coefficients α were investigated from the Kubelka–Munk function given by the formula where R is the reflectance value, F ( R ) is the Kubelka–Munk function, and α is the absorption coefficient. Moreover, in the Tauc relation, , values of the absorption coefficient were utilized to obtain band gap energy ( E g ). The relation is given by where A is the proportionality constant, h is Planck’s constant, and υ is the frequency of light.…”

Section: Resultsmentioning

confidence: 99%

“…where R is the reflectance value, F(R) is the Kubelka−Munk function, and α is the absorption coefficient. Moreover, in the Tauc relation, 41,42 values of the absorption coefficient were utilized to obtain band gap energy (E g ). The relation is given by…”

Section: Field Emission Scanning Electron Microscopymentioning

confidence: 99%

TiO₂-Doped Ni_0.4Cu_0.3Zn_0.3Fe₂O₄ Nanoparticles for Enhanced Structural and Magnetic Properties

Patil¹,

Pawar

Patange³

et al. 2021

ACS Omega

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TiO2 (0–10 wt %)-doped nanocrystalline Ni0.4Cu0.3Zn0.3Fe2O4 (Ni–Cu–Zn) ferrites were synthesized using the sol–gel route of synthesis. The cubic spinel structure of the ferrites having the Fd3m space group was revealed from the analysis of Rietveld refined X-ray diffraction (XRD) data. The secondary phase of TiO2 with a space group of I41/amd was observed within the ferrites with doping, x > 3 wt %. The values of lattice parameter were enhanced with the addition of TiO2 up to 5 wt % and reduced further for the highest experimental doping of 10 wt %. Field emission scanning electron microscopy (FESEM) images exhibit the spherical shape of the synthesized particles with some agglomeration, while the compositional purity of prepared ferrite samples was confirmed by energy-dispersive X-ray spectroscopy (EDX) and elemental mapping. The cubic spinel structure of the prepared ferrite sample was confirmed by the Raman and Fourier transform infrared (FTIR) spectra. UV–visible diffuse reflectance spectroscopy was utilized to study the optical properties of the ferrites. The value of band gap energy for the pristine sample was less than those of the doped samples, and there was a decrement in band gap energy values with an increase in TiO2 doping, which specifies the semiconducting nature of prepared ferrite samples. A magnetic study performed by means of a vibrating sample magnetometer (VSM) demonstrates that the values of saturation magnetization of the ferrites decrease with the addition of TiO2 content, and all investigated ferrites show the characteristics of soft magnetic materials at room temperature. The Mössbauer study confirms the decrease in the magnetic behavior of the doped ferrites due to the nonmagnetic secondary phase of TiO2.

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Structural, optical and magnetic properties of nanocrystalline zinc ferrite particles from glycine assisted combustion: Effect of Sr²⁺ dopant

Cited by 17 publications

References 58 publications

Investigation of Photoelectrocatalytic and Magnetic Properties of Sr₂YbRu_1–xTa_xO₆ (x = 0, 0.25, 0.5, 0.75, and 1)

Investigation of Photoelectrocatalytic and Magnetic Properties of Sr₂YbRu_1–xTa_xO₆ (x = 0, 0.25, 0.5, 0.75, and 1)

An Alternative Depressant of Chalcopyrite in Cu–Mo Differential Flotation and Its Interaction Mechanism

TiO₂-Doped Ni_0.4Cu_0.3Zn_0.3Fe₂O₄ Nanoparticles for Enhanced Structural and Magnetic Properties

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Structural, optical and magnetic properties of nanocrystalline zinc ferrite particles from glycine assisted combustion: Effect of Sr2+ dopant

Cited by 17 publications

References 58 publications

Investigation of Photoelectrocatalytic and Magnetic Properties of Sr2YbRu1–xTaxO6 (x = 0, 0.25, 0.5, 0.75, and 1)

Investigation of Photoelectrocatalytic and Magnetic Properties of Sr2YbRu1–xTaxO6 (x = 0, 0.25, 0.5, 0.75, and 1)

An Alternative Depressant of Chalcopyrite in Cu–Mo Differential Flotation and Its Interaction Mechanism

TiO2-Doped Ni0.4Cu0.3Zn0.3Fe2O4 Nanoparticles for Enhanced Structural and Magnetic Properties

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Structural, optical and magnetic properties of nanocrystalline zinc ferrite particles from glycine assisted combustion: Effect of Sr²⁺ dopant

Investigation of Photoelectrocatalytic and Magnetic Properties of Sr₂YbRu_1–xTa_xO₆ (x = 0, 0.25, 0.5, 0.75, and 1)

Investigation of Photoelectrocatalytic and Magnetic Properties of Sr₂YbRu_1–xTa_xO₆ (x = 0, 0.25, 0.5, 0.75, and 1)

TiO₂-Doped Ni_0.4Cu_0.3Zn_0.3Fe₂O₄ Nanoparticles for Enhanced Structural and Magnetic Properties