Synthesis and magnetic properties of cobalt ferrite nanoparticles in polycarbosilane ceramic matrix

Yurkov, G. Yu.; Shashkeev, K. A.; Kondrashov, S. V.; Popkov, O. V.; Щербакова, Г. И.; Zhigalov, D. V.; Pankratov, D. А.; Ovchenkov, E. A.; Koksharov, Y.A.

doi:10.1016/j.jallcom.2016.06.025

Cited by 14 publications

(5 citation statements)

References 44 publications

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“…The Mössbauer spectrum of the pig iron sample can be described by a superposition of seven narrow subspectra of sextets with related parameters, a sextet with a small splitting, but wide lines, and one low-intensity doublet (Table 6). The internal sextet (#8, Table 6) includes a combination of subspectrum with very close hyperfine parameters for compounds of iron with carbon: θ-Fe 3 C [49,50], and/or phosphorus: (Fe 1−x A x ) 2 P, where A is a transition metal [51]. The doublet (#9, Table 6) is characterized by a small isomeric shift, for example, characteristic of iron compounds in a tetrahedral or pyramidal environment with phosphorus [52,53] or for complex solutions of the type (Fe 1−x Mn x ) 2 P [54].…”

Section: Composition Of Pig Ironmentioning

confidence: 99%

Reductive Smelting of Neutralized Red Mud for Iron Recovery and Produced Pig Iron for Heat-Resistant Castings

Valeev

Zinoveev

Kondratiev

et al. 2019

Metals

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The chemical and mineral composition of the red mud from the Ural Aluminum Plant were studied by XRF, XRD, and Mössbauer spectroscopy. Experiments on reductive smelting of red mud were carried out in a range of temperatures (1650–1750 °C) to recover iron from the aluminum production waste with maximum efficiency. It was found that it is possible to obtain pig iron with a high content of titanium, phosphorus, and vanadium, and low sulfur content. The efficiency of iron recovery at 1750 °C was found to be around 98%. Thermodynamic calculations were carried out to assist in finding the optimal conditions for the process (e.g., carbon content, furnace temperature, slag liquidus temperature). It was also found that the pig iron phase obtained at 1650 to 1700 °C is not separated from the slag phase into ingot compared with the sample obtained at 1750 °C. Pig iron obtained at 1750 °C can be used to produce molds for the steel-casting equipment.

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Section: Composition Of Pig Ironmentioning

confidence: 99%

Reductive Smelting of Neutralized Red Mud for Iron Recovery and Produced Pig Iron for Heat-Resistant Castings

Valeev

Zinoveev

Kondratiev

et al. 2019

Metals

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“…The singlet denoted as γ-Fe-C refers to γ-Fe [51], which is a face centered-cubic phase of metallic iron stable normally above 910 • C. Apparently, the roasting conditions promoted the formation of γ-Fe, and dissolved carbon can stabilize this austenite structure [52]. All the samples contained the sextets with parameters similar to the cementite phase θ-Fe 3 C [53,54]. The samples with a lower degree of metallization (see Figure 7) also had another sextet, which probably refers to χ-Fe 5 C 2 [55].…”

Section: Thermodynamic Analysis Of the Influence Of K2co3 And Na2co3 mentioning

confidence: 99%

Influence of Na2CO3 and K2CO3 Addition on Iron Grain Growth during Carbothermic Reduction of Red Mud

Zinoveev

Grudinsky

Zakunov

et al. 2019

Metals

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Red mud is a by-product of alumina production from bauxite ore by the Bayer method, which contains considerable amounts of valuable components such as iron, aluminum, titanium, and scandium. In this study, an approach was applied to extract iron, i.e., carbothermic reduction roasting of red mud with sodium and potassium carbonates followed by magnetic separation. The thermodynamic analysis of iron and iron-free components’ behavior during carbothermic reduction was carried out by HSC Chemistry 9.98 (Outotec, Pori, Finland) and FactSage 7.1 (Thermfact, Montreal, Canada; GTT-Technologies, Herzogenrath, Germany) software. The effects of the alkaline carbonates’ addition, as well as duration and temperature of roasting on the iron metallization degree, iron grains’ size, and magnetic separation process were investigated experimentally. The best conditions for the reduction roasting were found to be as follows: 22.01% of K2CO3 addition, 1250 °C, and 180 min of duration. As a generalization of the obtained data, the mechanism of alkaline carbonates’ influence on iron grain growth was proposed.

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“…This behavior is consistent with superparamagnetic materials. 59,60 A distinct response is observed for the Fe 3 O 4 -AA-MOF sample. With decreasing temperature, both the sextet and the paramagnetic doublet show increased absorption intensity (Fig.…”

Section: Resultsmentioning

confidence: 96%

“…The methodology was adapted from previously established methods described by various authors. 31,44–67…”

Section: Methodsmentioning

confidence: 99%

Fenton reaction-driven pro-oxidant synergy of ascorbic acid and iron oxide nanoparticles in MIL-88B(Fe)

Bondarenko,

Baimuratova,

Dzeranov

et al. 2024

New J. Chem.

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Synthesis and magnetic properties of cobalt ferrite nanoparticles in polycarbosilane ceramic matrix

Cited by 14 publications

References 44 publications

Reductive Smelting of Neutralized Red Mud for Iron Recovery and Produced Pig Iron for Heat-Resistant Castings

Reductive Smelting of Neutralized Red Mud for Iron Recovery and Produced Pig Iron for Heat-Resistant Castings

Influence of Na2CO3 and K2CO3 Addition on Iron Grain Growth during Carbothermic Reduction of Red Mud

Fenton reaction-driven pro-oxidant synergy of ascorbic acid and iron oxide nanoparticles in MIL-88B(Fe)

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