Formation of nanocrystalline BiFeO3 during heat treatment of hydroxides co-precipitated in an impinging-jets microreactor

Проскурина, О. В.; Абиев, Р. Ш.; Данилович, Д. П.; Панчук, В. В.; Семенов, В. Г.; Nevedomsky, V. N.; Гусаров, В. В.

doi:10.1016/j.cep.2019.107598

Cited by 49 publications

(20 citation statements)

References 74 publications

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“…In this case, the smallest d values for double oxides are observed, as a rule, firstly, when L max values for these oxides are small, and secondly, when the chosen synthesis conditions limit the mass transfer in the reaction system (see references in Table 2). Mass transfer limitation was achieved either by the synthesis conditions that ensure the presence in the reaction system of structural precursors of the forming crystalline phases and low rates of components diffusion (see, e.g., [37,45,[77][78][79][80]), or by the formation of spatial constraints that inhibit the growth of the formed nanocrystals (see, e.g., [48, 63-65, 72, 139]).…”

Section: Resultsmentioning

confidence: 99%

“…The conditions of nanoparticle synthesis by these methods have been previously described [33, 35-48, 63-66, 77-80, 92-94]. In some cases, the growth of nanocrystals was retarded by applying techniques based on the organization and self-organization of spatial constraints that prevent mass transfer and, consequently, the growth of nanocrystals during the synthesis [63,72,[77][78][79][80].…”

Section: Methodsmentioning

confidence: 99%

“…Another group of methods that includes, for example, solution combustion, self-propagating high-temperature synthesis (SHS), autocatalytic and other fast solidstate reactions, is based on the use of rapid synthesis [49][50][51][60][61][62][63][64][65][66][67][68][69][70][71]. Crystal growth can often be restricted by using nano-and microreactors, or synthesis methods that use spatial constraints [63,64,[72][73][74][75][76][77][78][79][80][81][82].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The minimum size of oxide nanocrystals: phenomenological thermodynamic vs crystal-chemical approaches

Almjasheva¹,

Ломанова²,

Попков³

et al. 2019

Nanosystems: Phys. Chem. Math.

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The minimum crystallite size in a group of oxides has been analyzed as a function of their synthesis conditions, critical nucleus size and the crystal structure parameters. Nanocrystals were synthesized by solution combustion, hydrothermal synthesis and heat treatment in air of the precipitated hydroxides. Aluminum and iron oxides, titania and zirconia, cobalt ferrite, AFeO 3 ferrites (A = Bi, RE), Aurivillius phases Bi m+1 Ti 3 Fe m−3 O 3m+3 (m = 3 -9), as well as solid solutions based on these phases were chosen as the objects of the study. The presence of a correlation between the crystalline oxide unit cell parameters and the synthesized crystals minimum size is shown. A conclusion was made about the impossibility to use only the thermodynamic concept of the critical nucleus for determining the minimum possible particle size of a new phase in some cases of oxide nanocrystals synthesis. The paper demonstrates a necessity to use crystal-chemical criteria that complement the methods of phenomenological thermodynamics and kinetics for determining the minimum possible particle size of the resulting crystalline oxide phases synthesized under the considered conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The minimum size of oxide nanocrystals: phenomenological thermodynamic vs crystal-chemical approaches

Almjasheva¹,

Ломанова²,

Попков³

et al. 2019

Nanosystems: Phys. Chem. Math.

Self Cite

View full text Add to dashboard Cite

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“…Микросмесители, активно разрабатываемые в последние два десятилетия [1,2], являются не только средством тонкого смешения растворов, но и мощным инструментом для проведения химических реакций, поскольку способны обеспечить равномерность распределения молекул, атомов и ионов реагирующих веществ, близкую к идеальной. Как было показано в недавних работах [3][4][5][6], это приводит к получению продуктов в соответствии со стехиометрией реакций, а вероятность возникновения побочных продуктов снижается до нуля.…”

Section: Introductionunclassified

IMPINGING-JETS MICROREACTORS: MODERN STATE AND FUTURE TRENDS OF APPLICATIONS IN CHEMICAL TECHNOLOGIES (a Review)

Абиев¹,

Sirotkin²

2020

Bulletin of St PbSIT(TU)

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This review discusses the features of micromixing processes, existing designs, application examples and the advantages of impinging-jets microreactors-one of the modern means of mixing processes intensification and carrying out chemical reactions with high selectivity. It was shown that impinging-jets microreactors are a promising tool for the controlled synthesis of nanosized particles, one of the modifications of "wet chemistry" methods-either directly in the microreactor (at room temperature and atmospheric pressure) as in the synthesis of CoFe2O4, LaPO4, or with subsequent heat treatment-for example, for the formation of BiFeO3,

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“…Unique structural and electromagnetic parameters allow the use of these type substances in the production of microwave ceramics, magnetically recoverable catalysts, magnetic devices, etc. [4][5][6]. Among a large number of rare-earth metal orthoferrites, terbium ferrite (TbFeO 3 ) stands out, due to its antiferromagnetic and ferroelectric properties [7].…”

Section: Introductionmentioning

confidence: 99%

Facile combustion synthesis of TbFeO3 nanocrystals with hexagonal and orthorhombic structure

Martinson¹,

Ivanov²,

Chebanenko³

et al. 2019

Nanosystems: Phys. Chem. Math.

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In this research, the formation process of nanocrystalline terbium orthoferrite (TbFeO 3) obtained via a solution combustion technique was studied using powder X-ray diffractometry, scanning electron microscopy, 57 Fe Mössbauer spectroscopy, N 2 adsorption analysis, and FTIR spectroscopy. It was shown that glycine-nitrate combustion method permits one to obtain TbFeO 3 of three different modifications: orthorhombic o-TbFeO 3 (Pbnm), hexagonal h-TbFeO 3 (P6 3 /mmc) and amorphous am-TbFeO 3. It was found that the average crystallite sizes of orthorhombic and hexagonal TbFeO 3 were 29±3 and 15±2 nm, respectively. The formation mechanism of different structural forms of terbium orthoferrite was investigated on the basis of nanopowders morphology, specific surface areas, average pore sizes, and crystallite sizes.

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Formation of nanocrystalline BiFeO3 during heat treatment of hydroxides co-precipitated in an impinging-jets microreactor

Cited by 49 publications

References 74 publications

The minimum size of oxide nanocrystals: phenomenological thermodynamic vs crystal-chemical approaches

The minimum size of oxide nanocrystals: phenomenological thermodynamic vs crystal-chemical approaches

IMPINGING-JETS MICROREACTORS: MODERN STATE AND FUTURE TRENDS OF APPLICATIONS IN CHEMICAL TECHNOLOGIES (a Review)

Facile combustion synthesis of TbFeO3 nanocrystals with hexagonal and orthorhombic structure

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