Effect of Fe/Pb molar ratio on the structure, magnetic and dielectric properties of PbFe12O19 nanoparticles

Rostami, Zohreh; Ghahfarokhi, S. E. Mousavi; Kazeminezhad, Iraj

doi:10.1016/j.cjph.2018.01.005

Cited by 6 publications

(3 citation statements)

References 29 publications

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“…Sözeri et al [34] reported that the pure BaFe 12 O 19 particles could be obtained by the citrate sol-gel combustion method with an initial Fe/Ba molar ratio of 4. Rostami et al [35] synthesized the pure PbFe Where k is the shape factor, the k value is 0.62. λ is the X-ray wavelength and θ is the Bragg diffraction angle. β is the full-width at half maximum (FWHM) on the basis of the pseudo-Voigt function [32] .…”

Section: Phase Purity and Structure Analysismentioning

confidence: 99%

Hexagonal Lead Ferrite Magnetic Separation Catalysts: Synthesis, Optical Characterization, Ultrasonic Catalytic Activity and Performance Prediction

2022

J Mod Polym Chem Mater

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Objective: This study was performed to explore a new method to synthesize PbFe 12 O 19 magnetic separation catalysts and analyze its ultrasonic catalytic activity for the degradation of rhodamine B (RhB) dye under ultrasonic vibration.Methods: A polyacrylamide gel method was developed to synthesize the hexagonal lead ferrite (PbFe 12 O 19 ) magnetic separation catalysts with different Fe/Pb molar ratios and sintering temperatures. Results:The phase structure and composition of PbFe 12 O 19 magnetic separation catalysts altered with the change in the Fe/Pb mole ratio and sintering temperature. The color properties, energy band values and degradation percentages of PbFe 12 O 19 magnetic separation catalysts for the degradation of RhB dye under ultrasonic vibration were linearly independent of Fe/Pb mole ratio and sintering temperature. The maximum degradation percentage of 78.99% for the PbFe 12 O 19 magnetic separation catalysts for the removal of RhB from wastewater was found at 2g/L of initial catalyst concentration, 50mg/L of initial dye concentration, and 180min of vibration time. Conclusion:The PbFe 12 O 19 magnetic separation catalysts exhibited high catalytic activity for the degradation of RhB dye under ultrasonic vibrations. Based on the experiment parameters, a neural network model was established to predict the effect of synthesis parameters on the degradation percentage of PbFe 12 O 19 catalysts. This work further confirmed that the neural network algorithm was available to predict the ultrasonic catalytic activity of semiconductor materials.

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Section: Phase Purity and Structure Analysismentioning

confidence: 99%

Hexagonal Lead Ferrite Magnetic Separation Catalysts: Synthesis, Optical Characterization, Ultrasonic Catalytic Activity and Performance Prediction

2022

J Mod Polym Chem Mater

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“…In papers by Tan et al [ 7 , 8 ], as well as in a number of other publications [ 9 , 10 , 11 , 12 , 13 ], lead hexaferrite was synthesized using “wet” chemistry methods. The use of low-temperature methods for its synthesis is justified by the need to preserve the final product stoichiometry, which may be disturbed during heat treatment due to the volatility of lead oxide.…”

Section: Introductionmentioning

confidence: 99%

“…The lead hexaferrite samples obtained by Mahdiani et al [ 11 ] at 900 °C, in addition to Fe 2 O 3 , contain an impurity of Fe 3 O 4 magnetite, and the use of a long ultrasonic treatment at maximum power in the early synthesis stages helps to reduce the content of impurity phases. Finally, according to Mahdiani et al [ 11 ], Yang et al [ 12 ], and Rostami et al [ 13 ], a deviation of the Pb:Fe ratio from the stoichiometric one towards the increase of lead has a beneficial effect on the final product purity.…”

Section: Introductionmentioning

confidence: 99%

Gel Synthesis of Hexaferrites Pb1−xLaxFe12−xZnxO19 and Properties of Multiferroic Composite Ceramics PZT–Pb1−xLaxFe12−xZnxO19

Lisnevskaya

Aleksandrova

2020

Nanomaterials

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We investigated the opportunities for obtaining hexaferrites Pb1−хLaхFe12−xZnxO19 (х = 0–1) from citrate–glycerin gel and showed that synthesis occurs via the formation of the Fe3O4 phase; products with a small amount of hematite impurity Fe2O3 can be obtained after firing at 800 to 900 °С with 0 £ х £ 0.5. If х > 0.5, perovskite-like LaFeO3 is formed in samples, so that if х = 0.9–1, the synthesis products virtually do not contain phases with hexaferrite structures and represent a mixture of LaFeO3, Fe2O3, and Fe3O4. Within the range of 0 £ х £ 0.5, the electrical and magnetic characteristics of hexaferrites Pb1–хLaхFe12−xZnxO19 are slightly dependent on х and have the following average values: A relative permittivity e/e0 ~45, a dielectric loss tangent tan d ~0.6, an electrical resistivity R ~109 Ohm×cm, coercivity Нс ~3 kOe, saturation magnetization Ms ~50 emu/g, and remanent magnetization Mr ~25 emu/g. The magnetoelectric (ME) ceramics 50 wt.% PZTNB‑1 + 50 wt.% Pb1−xLaxFe12−xZnxO19 (PZTNB‑1 is an industrial piezoelectric material based on lead titanate zirconate (PZT) do not contain impurity phases and have the following characteristics: Piezoelectric coefficients d33 = 10–60 and –d31 = 2–30 pC/N, piezoelectric voltage coefficients g33 = 2–13 and ‑g31 = 1–5 mV×m/N, an electromechanical coupling coefficient Kp = 0.03–0.13, magnetic parameters Нс = 3–1 kOe, Ms = 50–30, and Mr = 25–12 emu/g. The maximum ME coupling coefficient ΔE/ΔH ~1.75 mV/(cm×Oe) was achieved with х = 0.5.

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A novel lead hexagonal ferrite (PbFe12O19) magnetic separation catalyst with excellent ultrasonic catalytic activity

Chen

Wang

Gao

et al. 2022

J Sol-Gel Sci Technol

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Effect of Fe/Pb molar ratio on the structure, magnetic and dielectric properties of PbFe12O19 nanoparticles

Cited by 6 publications

References 29 publications

Hexagonal Lead Ferrite Magnetic Separation Catalysts: Synthesis, Optical Characterization, Ultrasonic Catalytic Activity and Performance Prediction

Hexagonal Lead Ferrite Magnetic Separation Catalysts: Synthesis, Optical Characterization, Ultrasonic Catalytic Activity and Performance Prediction

Gel Synthesis of Hexaferrites Pb1−xLaxFe12−xZnxO19 and Properties of Multiferroic Composite Ceramics PZT–Pb1−xLaxFe12−xZnxO19

A novel lead hexagonal ferrite (PbFe12O19) magnetic separation catalyst with excellent ultrasonic catalytic activity

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