Synthesis, characterization and optical band gap of Pirochromite (MgCr2O4) Nanoparticles by Stearic Acid Sol-Gel Method

Jafarnejad, Ehsan; Khanahmadzadeh, Salah; Ghanbary, Fatemeh; Enhessari, Morteza

doi:10.5267/j.ccl.2016.7.001

Cited by 17 publications

(12 citation statements)

References 17 publications

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“…The first MgO is a friable powder which has the density about 2.3 g/sm 3 , rather big specific surface and reactivity from high to medium. MgO produced under a hard burning has medium crystallites dimensions and the lower activity because of lower specific surface.…”

Section: Resultsmentioning

confidence: 99%

“…It attracts the attention because of its unique physical and chemical properties and technological possibilities. This spinel is used in some refractories' composition [1,2], semiconductors [3], magnetic and electrical materials [4], sensors [5], catalysts [6][7][8], photocatalysts [9], pigments [10], etc. Active work on nanoceramics and nanocomposites with MgCr 2 O 4 participation [8,9,[11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…Magnesium chromite is synthesized by means of different ways, namely: ceramic synthesis [15,16], co-precipitation [7], sol-gel method [3,6], combustion [11], hydrothermal method [12], zone melting [4], co-crystallization [17], etc. At the same time, solid-phase synthesis remains as the main industrial mode.…”

Section: Introductionmentioning

confidence: 99%

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MAGNESIOCHROMITE (MgCr2O4) SYNTHESIS: EFFECT OF MECHANICAL AND MICROWAVE PRETREATMENT

Kosenko

Filatova

Egorova

2020

IVKKT

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Magnesiochromite spinel synthesis based on oxides, hydroxides and nitrates of magnesium and chromium was investigated. The precursors reactivity was compared by means of effective rate constants calculated by Ginstling-Brounshtein equation. The possibility of use of this equation was confirmed by the dependences linearity with high linear approximation coefficients. The reactivity of MgO various forms (soft-burned, or caustic magnesite, and dead-burned, or periclase) in the spinel formation was compared. Oxide precursors (especially with the periclase participation) reacted with the substantially less rate in comparison with hydroxides and salts. The influence of a preliminary mechanical activation by impact-and-attrition (planetary mill) and attrition (ball-ring mill) action as well as a microwave treatment (2.45 GHz) was analyzed. The most positive effect of a mechanical treatment in a planetary mill that was associated with an activation of Mg and Cr compounds became apparent in the field of relatively low temperatures (700-1100 °С). For example, MgCr2O4 yield at 1000 °С and the joint impact treatment of oxides was twice as much than under the simple mixing. The subsequent temperature rising lead to some decrease of a pretreatment effect so long as diffusion coefficients in these conditions grew, so the reaction run rapidly even without a preliminary mechanical treatment. It was noticed that an appreciable reduction of MgO reactivity in the spinel formation after a certain attrition in a ball-ring mill linked to the plane sliding in cubic crystals and resulted in the removing of the most disordered and defective layer from grains and the plane surface uncovering. The combined method consisting of a mechanical treatment of magnesium and chromium nitrates mixture in a planetary mill and the subsequent burning in a thermal kiln (1000 °С) was considered as the most effective as it resulted in practically single product. The microwave treatment took up an intermediate position by the effectiveness.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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MAGNESIOCHROMITE (MgCr2O4) SYNTHESIS: EFFECT OF MECHANICAL AND MICROWAVE PRETREATMENT

Kosenko

Filatova

Egorova

2020

IVKKT

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“…Many researchers used stearic acid gel to synthesize nanomaterials. Jafarnejad et al [196] used this method to synthesize MgCr 2 O 4 and Enhessari et al [197] synthesized CoTiO 3 by using stearic acid gel method.Zhang et al [198]synthesized MnZn ferrite with chemical formula Mn x Zn 1-x Fe 2 O 4 by using stearic acid gel method. Proper amounts of MnCO 3 , Zn(NO 3 ) 2 .6H 2 Oand Fe(NO 3 ) 2 .9H 2 O were powdered and mixed with Stearic acid in molten form.…”

Section: 9mentioning

confidence: 99%

A review on MnZn ferrites: Synthesis, characterization and applications

Thakur

Chahar

Taneja

et al. 2020

Ceramics International

302

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Researchers are taking great interest in the synthesis and characterization of MnZn ferrites due to their wide range of applications in many areas. MnZn ferrites are a class of soft magnetic materials that have very good electrical, magnetic and optical properties. The properties of MnZn ferrites include high value of resistivity, permeability, permittivity, saturation magnetization, low power losses and coercivity. The above mentioned advantageous features of MnZn ferrites make them suitable for the use in various applications. In biomedical field these ferrites are used for cancer treatment and MRI. MnZn ferrites are also used in electronic applications for making transformers, transducers and inductors. These ferrites are also used in magnetic fluids, sensors and biosensors. MnZn ferrite is highly useful material for several electrical and electronic applications. It finds applications in almost every household appliances like mobile charger, LED bulb, TV, refrigerator, juicer mixer, washing machine, iron, microwave oven, mobile, laptop, desktop, printer and so on. Therefore, the present review focuses on different techniques for synthesis of MnZn ferrites in literature, their characterization tools, effect of doping on the properties of MnZn ferrite and finally we will discuss about their applications.

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“…Хромит магния синтезируют различными способами: керамическим синтезом [1,2], соосаждением [3,4], золь-гель методом [5,6], горением [7,8] и др. Вместе с тем, для промышленных целей основным остается твердофазный синтез, предусматривающим взаимодействие между оксидами цинка и алюминия.…”

Section: вступлениеunclassified

Механоактивированный Керамический Синтез Магнезиального-Хромитовой Шпинели

Kosenko¹,

Filatova²,

Egorova³

2018

НВвБ

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Исследован процесс синтеза шпинели MgCr2O4, исходя из оксидов и гидроксидов магния и хрома. Проанализировано влияние предварительной механоактивации ударным и истирающим способом в планетарной и шаро-кольцевой мельнице

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Synthesis, characterization and optical band gap of Pirochromite (MgCr2O4) Nanoparticles by Stearic Acid Sol-Gel Method

Cited by 17 publications

References 17 publications

MAGNESIOCHROMITE (MgCr2O4) SYNTHESIS: EFFECT OF MECHANICAL AND MICROWAVE PRETREATMENT

MAGNESIOCHROMITE (MgCr2O4) SYNTHESIS: EFFECT OF MECHANICAL AND MICROWAVE PRETREATMENT

A review on MnZn ferrites: Synthesis, characterization and applications

Механоактивированный Керамический Синтез Магнезиального-Хромитовой Шпинели

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