Synthesis of Co-Zr doped nanocrystalline strontium hexaferrites by sol-gel auto-combustion route using sucrose as fuel and study of their structural, magnetic and electrical properties

Kaur, Prabhjyot; Chawla, S.K.; Meena, Sher Singh; Yusuf, S.M.; Narang, Sukhleen Bindra

doi:10.1016/j.ceramint.2016.06.053

Cited by 63 publications

(28 citation statements)

References 56 publications

(45 reference statements)

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“…The X‐ray diffraction (XRD) analysis of the synthesized photocatalyst was carried out on a Philips (X'pert Pro MPD) X‐ray diffractometer, employing the Cu Kα radiation (wavelength 1.5406 Å) equipped with a Ni filter over the range of 10–90° (2θ). The crystallite sizes of the samples were calculated using the Scherrer equation . In addition, the morphologies of the modified photocatalyst were observed by transmission electron microscopy (TEM, Phillips CM10).…”

Section: Experimental and Methodsmentioning

confidence: 99%

“…Doping TiO 2 with metals and non‐metals (such as silver and sulphur respectively) has been known as an efficient strategy to extend its optical response from UV to visible light range . Doping these impurities into the TiO 2 matrix can decrease the band gap of the semiconductor and increase the photocatalytic activity of TiO 2 under the visible light significantly without modifying its surface properties . Furthermore, it has been proved that using poly ethylene glycol (PEG) as a template reagent could act as a significant factor to improve the efficiency of the photocatalytic system under visible light irradiation …”

Section: Introductionmentioning

confidence: 99%

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Individual and interaction effects of operating parameters on the photocatalytic degradation under visible light illumination: Response surface methodological approach

et al. 2017

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In this study, for the first time a statistical analysis based on the response surface methodology (RSM) was employed to investigate individual and interaction effects of key operating parameters of the photocatalytic degradation under visible-light irradiation using Ag-S/PEG/TiO 2 . Ag-S/PEG/ TiO 2 is a visible-light-driven photocatalyst and was synthesized (based on earlier research) by co-doping of TiO 2 with silver and sulphur and addition of polyethylene glycol (as a reagent template). In addition, the model pollutant was methylene orange (MO) and the studied operating parameters included the photocatalyst loading, initial concentration of the pollutant, and pH of the solution. The statistics-based experimental design and RSM was utilized to find a quadratic model as a functional relationship between the degradation efficiency and the three operating parameters. The regression analysis with R 2 value of 0.9678 showed a close fit between the model prediction and experimental data of the degradation efficiency. The analysis of variance based on the model indicated that pH of the solution was the most influential factor, while the two other operating parameters were also significant. The efficiency of MO degradation reached 94.0 % under the optimum conditions (i.e. photocatalyst loading of 1.20 g/L, MO concentration of 5 mg/L, and pH of 2).

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Section: Experimental and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Individual and interaction effects of operating parameters on the photocatalytic degradation under visible light illumination: Response surface methodological approach

et al. 2017

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“…These fuels are harmful to the environment and hazardous to work with. The synthesis of nanopowder of different ceramic oxides by the combustion method using sucrose as fuel has been reported in the literature . The molecular formula of sucrose is C 12 H 22 O 11 and its structural formula has glucose and fructose monosaccharides connected via an ether bond that are formed between the reducing ends of both glucose and fructose.…”

Section: Introductionmentioning

confidence: 99%

“…The synthesis of nanopowder of different ceramic oxides by the combustion method using sucrose as fuel has been reported in the literature. [12][13][14][15][16] The molecular formula of sucrose is C 12 H 22 O 11 and its structural formula has glucose and fructose monosaccharides connected via an ether bond that are formed between the reducing ends of both glucose and fructose. In the presence of metal nitrate oxidants, the sucrose may get hydrolyzed to glucose and fructose.…”

Section: Introductionmentioning

confidence: 99%

Sucrose‐nitrate auto combustion synthesis of Ce _0.85 Ln _0.10 Sr _0.05 O _{2‐
δ} (Ln = La and Gd) electrolytes for solid oxide fuel cells

et al. 2020

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Summary Nanocrystalline powders of co‐doped ceria oxides Ce0.85La0.10Sr0.05O2‐δ (CLSO) and Ce0.85Gda0.10Sr0.05O2‐δ (CGSO) have been synthesized by auto combustion method at 100°C using sucrose as fuel. Thermal analysis (TGA/DSC) of as‐prepared powders indicated calcination above 400°C to remove organic residue. The average grain size of the pellets sintered at 1200°C for 4 hours is 436 and 683 nm for CLSO and CGSO, respectively. The electrical conductivity of the sintered samples was determined by impedance measurements in the temperature range 300°C to 600°C and the frequency range 20 Hz to 2 MHz. At 600°C, the total electrical conductivity (σt) of CGSO is 6.78 × 10−3 S cm−1, 2.5 times higher than 2.72 × 10−3 S cm−1 of CLSO. Further, it is found that the value of grain boundaries blocking factor (αgb) of CGSO is 0.47 which is 30% lesser than 0.68 of CLSO at 600°C. The higher value of electrical conductivity of CGSO as compared to CLSO is attributed to the lesser blocking effect of grain boundaries, smaller lattice distortion and denser microstructure of CGSO as compared to CLSO. The electrical conductivity of synthesized samples has been compared with the electrical conductivity of similar compositions of co‐doped CeO2 oxides. Our study indicated that the sintering temperature, and hence, the morphology of sintered samples has a significant role in determining the electrical conductivity. The presence of oxygen vacancies in the synthesized samples is experimentally supported by using UV‐visible spectroscopy, Raman spectroscopy, and thermal analysis techniques.

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“…In addition, co-doped Tm-Tb, Eu-Nd, Sm-Co Ba-hexaferrites have also been investigated and have been shown that co-doping of the rare-earth ions provides hexaferrites with a rise in the magnetization and/or coercivity [24][25][26][27]. Among other magnetic properties, some attempts have also been made to improve the maximum energy product, (BH)max for Srhexaferrites and Ba-hexaferrites using La-Sm [28,29].Researchers have different manufacturing methods to produce hexaferrites such as traditional ceramic methods [30][31][32][33][34] or several chemical methods [35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Effect of Rare-Earth Co-Doping on the Microstructural and Magnetic Properties of BaFe₁₂O₁₉

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et al. 2020

Advances in Materials Science

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Ba0.85(La,Y)0.15Fe12O19 hexaferrite magnets were produced using the powder metallurgy method. The phase analysis of the ferrite magnets was carried out by X-ray diffraction (XRD) technique. A single hexaferrite phase was present in both samples as revealed by XRD patterns. The microstructural evolution in the hexaferrite samples was examined using Scanning Electron Microscopy (SEM) equipped with Energy Dispersive X-Ray Spectroscopy (EDS). The grain morphology altered with the sintering temperature. Room temperature ferrimagnetic hysteresis curves were obtained by Vibrating Sample Magnetometer (VSM). The crystallite size and the lattice parameters (a,c) were also calculated after sintering at 1150ºC and 1250ºC. Saturation magnetizations, Ms were determined to be 48.60 emu/g and 52.95 emu/g for the samples sintered at 1150ºC and 1250ºC, respectively whereas the remanent magnetizations, Mr were 29.26 emu/g and 31.17 emu/g. The coercivity, Hc decreased from 3.95 kOe to the value of 2.44 kOe with the sintering temperature due to the increase of the crystallite size. The squareness ratios (Mr/Ms) of the ferrimagnetic samples were different because the uniaxial anisotropies altered after sintering at 1150ºC and 1250ºC. The maximum energy product, (BH)max dropped from 35.81 kJ/m3 to 27.38 kJ/m3 when the sintering temperature increased. This result can be attributed to a combination of higher magnetization and the lower coercivity.

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Synthesis of Co-Zr doped nanocrystalline strontium hexaferrites by sol-gel auto-combustion route using sucrose as fuel and study of their structural, magnetic and electrical properties

Cited by 63 publications

References 56 publications

Individual and interaction effects of operating parameters on the photocatalytic degradation under visible light illumination: Response surface methodological approach

Individual and interaction effects of operating parameters on the photocatalytic degradation under visible light illumination: Response surface methodological approach

Sucrose‐nitrate auto combustion synthesis of Ce _0.85 Ln _0.10 Sr _0.05 O _{2‐
δ} (Ln = La and Gd) electrolytes for solid oxide fuel cells

Effect of Rare-Earth Co-Doping on the Microstructural and Magnetic Properties of BaFe₁₂O₁₉

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Synthesis of Co-Zr doped nanocrystalline strontium hexaferrites by sol-gel auto-combustion route using sucrose as fuel and study of their structural, magnetic and electrical properties

Cited by 63 publications

References 56 publications

Individual and interaction effects of operating parameters on the photocatalytic degradation under visible light illumination: Response surface methodological approach

Individual and interaction effects of operating parameters on the photocatalytic degradation under visible light illumination: Response surface methodological approach

Sucrose‐nitrate auto combustion synthesis of Ce 0.85 Ln 0.10 Sr 0.05 O 2‐ δ (Ln = La and Gd) electrolytes for solid oxide fuel cells

Effect of Rare-Earth Co-Doping on the Microstructural and Magnetic Properties of BaFe12O19

Contact Info

Product

Resources

About

Sucrose‐nitrate auto combustion synthesis of Ce _0.85 Ln _0.10 Sr _0.05 O _{2‐
δ} (Ln = La and Gd) electrolytes for solid oxide fuel cells

Effect of Rare-Earth Co-Doping on the Microstructural and Magnetic Properties of BaFe₁₂O₁₉