Obtaining the highly pure barium titanate nanocrystals by a new approach

Ashiri, Rouholah; Moghadam, Ali Heidary; Ajami, Reza

doi:10.1016/j.jallcom.2015.06.234

Cited by 25 publications

(12 citation statements)

References 31 publications

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“…Figure presents FE‐SEM micrographs of BTO nanopowder products obtained in this work. According to the micrographs, it is evident that the barium titanate nanopowders are highly agglomerated in nature which this character is similar to our previous works . This is related to the nature of the process and also calcination step which helps partial surface bonding in the powder products.…”

Section: Resultssupporting

confidence: 80%

“…According to the micrographs, it is evident that the barium titanate nanopowders are highly agglomerated in nature which this character is similar to our previous works. 17,22,23,27,28,[32][33][34][35][36][60][61][62] This is related to the nature of the process and also calcination step which helps partial surface bonding in the powder products. Meanwhile, it can be said that the small particles which are seen in agglomerates are barium titanate nanocrystals.…”

Section: Ft-raman Spectrummentioning

confidence: 99%

“…Therefore, obtainment of high quality carbonate‐free barium titanate nanopowders by mechanically induced solid‐state reactions is one of the main goals of the current research. On the other hand, the processing conditions have a significant impact on the quality and response of the powder products . Therefore, careful selection of the processing conditions/parameters is critically essential for obtaining the quality barium titanate nanocrystals.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the processing conditions have a significant impact on the quality and response of the powder products. 22,[32][33][34] Therefore, careful selection of the processing conditions/parameters is critically essential for obtaining the quality barium titanate nanocrystals. In addition, although the postmilling thermal treatment plays a dominant role on controlling the structure, microstructure and final phase of the nanopowders; however, the characteristics of the starting materials also have significant contribution.…”

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confidence: 99%

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Tetragonality enhancement in BaTiO₃ by mechanical activation of the starting BaCO₃ and TiO₂ powders: Characterization of the contribution of the mechanical activation and postmilling calcination phenomena

Moghtada

Moghadam

Ashiri

2018

Int J Applied Ceramic Tech

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By‐products including unwanted phase formation and/or unreacted starting materials are normally seen in the outcome of solid‐state synthesis approaches used in the literature for powder processing of advanced materials; this drawback requires critical attention and must be addressed in the new synthesis pathways in order to obtain quality powder products. A high energy mechanical milling approach was developed in this work. Addressing the drawback, the starting materials were mechanically activated by a high energy ball mill before their mixing step. It was found that highly pure barium titanate nanopowders with high tetragonality character are obtained using the approach developed here. The work also characterized tetragonality, role of the mechanical activation and postmilling thermal treatment on structure, phase formation and morphology of the obtained powder products. It was found that the mechanical activation accelerates the kinetic of formation of barium titanate and enhances the purity and tetragonality of the final products. The mechanism behind this achievement and the related reaction pattern are disclosed in this work. In order to obtain highly pure tetragonal barium titanate, a calcination temperature of 1173 K (900°C) after 30 hours mechanical activation is necessary; if these requirements are not satisfied, the final powder product contains impure phases and/or unreacted starting materials. The results also indicated that the processing conditions result in enhancement of tetragonality character of the final powder products. It seems that the method developed here can be used as a generalized methodology for obtaining the quality highly pure monosized nanocrystals of the mixed oxides for assembling in nanotechnology.

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Section: Resultssupporting

confidence: 80%

Section: Ft-raman Spectrummentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Tetragonality enhancement in BaTiO₃ by mechanical activation of the starting BaCO₃ and TiO₂ powders: Characterization of the contribution of the mechanical activation and postmilling calcination phenomena

Moghtada

Moghadam

Ashiri

2018

Int J Applied Ceramic Tech

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“…We chose one of the most popular solid‐state addition reactions for the synthesis of polycrystalline barium titanate (BaTiO 3 , BT) from an equimolar powder mixture of BaCO 3 and TiO 2. 13‐17 …”

Section: Introductionmentioning

confidence: 99%

Roles of local reactivity on the solid‐state addition reaction kinetics

Cho

Senna

2020

J Am Ceram Soc

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A predominant factor of the diffusion‐controlled kinetics of a solid‐state addition reaction using powder is the particle size of the reactants, into which the other chemical species are migrating. However, diffusion‐controlled kinetic equations are seldom satisfactorily applicable even when the effects of particle size are thoroughly accounted. One of the representative nongeometrical items affecting the solid‐state reaction process is the reactivity of solids (ROS), which has not been accounted in any of the established kinetic equations. Change in ROS is the consequence of the imperfections of the crystalline solids. In this study, we try to discuss the effects of ROS on the solid‐state reaction kinetics. A typical solid‐state addition reaction, formation of BaTiO3 from the equimolar mixture of TiO2 and BaCO3, was chosen as a model. For this reaction, the rate‐determining step is established to be the diffusion of Ba2+ ions into TiO2. Since the defect concentration is known to be higher at the near‐surface region, the local distribution of ROS that is discussed here is based on a simple core‐shell model of the host TiO2 particles with higher reactivity at the shell part. The ratio of the rate of diffusion within the shell part relative to that of the core (factor n), and the ratio of shell thickness, Rs, relative to the particle radius, Rp, (factor g) were chosen as main parameters to be iterated. By systematically varying these two factors, n and g, we succeeded in minimizing the fluctuation of apparent diffusion rate constant by the particle size. Despite the oversimplified model and lacking experimental evidences of the hypothetical parameters, the present proposal may pave the way to introduce ROS and its local distribution into the reaction kinetics. We also discussed the effects of second phases by comparing the same reaction process observed from the decomposition of the reactant and formation of the products.

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A Comprehensive Review on Barium Titanate Nanoparticles as a Persuasive Piezoelectric Material for Biomedical Applications: Prospects and Challenges

Sood

Desseigne

Dev

et al. 2022

Small

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Stimulation of cells with electrical cues is an imperative approach to interact with biological systems and has been exploited in clinical practices over a wide range of pathological ailments. This bioelectric interface has been extensively explored with the help of piezoelectric materials, leading to remarkable advancement in the past two decades. Among other members of this fraternity, colloidal perovskite barium titanate (BaTiO3) has gained substantial interest due to its noteworthy properties which includes high dielectric constant and excellent ferroelectric properties along with acceptable biocompatibility. Significant progression is witnessed for BaTiO3 nanoparticles (BaTiO3 NPs) as potent candidates for biomedical applications and in wearable bioelectronics, making them a promising personal healthcare platform. The current review highlights the nanostructured piezoelectric bio interface of BaTiO3 NPs in applications comprising drug delivery, tissue engineering, bioimaging, bioelectronics, and wearable devices. Particular attention has been dedicated toward the fabrication routes of BaTiO3 NPs along with different approaches for its surface modifications. This review offers a comprehensive discussion on the utility of BaTiO3 NPs as active devices rather than passive structural unit behaving as carriers for biomolecules. The employment of BaTiO3 NPs presents new scenarios and opportunity in the vast field of nanomedicines for biomedical applications.

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Obtaining the highly pure barium titanate nanocrystals by a new approach

Cited by 25 publications

References 31 publications

Tetragonality enhancement in BaTiO₃ by mechanical activation of the starting BaCO₃ and TiO₂ powders: Characterization of the contribution of the mechanical activation and postmilling calcination phenomena

Tetragonality enhancement in BaTiO₃ by mechanical activation of the starting BaCO₃ and TiO₂ powders: Characterization of the contribution of the mechanical activation and postmilling calcination phenomena

Roles of local reactivity on the solid‐state addition reaction kinetics

A Comprehensive Review on Barium Titanate Nanoparticles as a Persuasive Piezoelectric Material for Biomedical Applications: Prospects and Challenges

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Obtaining the highly pure barium titanate nanocrystals by a new approach

Cited by 25 publications

References 31 publications

Tetragonality enhancement in BaTiO3 by mechanical activation of the starting BaCO3 and TiO2 powders: Characterization of the contribution of the mechanical activation and postmilling calcination phenomena

Tetragonality enhancement in BaTiO3 by mechanical activation of the starting BaCO3 and TiO2 powders: Characterization of the contribution of the mechanical activation and postmilling calcination phenomena

Roles of local reactivity on the solid‐state addition reaction kinetics

A Comprehensive Review on Barium Titanate Nanoparticles as a Persuasive Piezoelectric Material for Biomedical Applications: Prospects and Challenges

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Tetragonality enhancement in BaTiO₃ by mechanical activation of the starting BaCO₃ and TiO₂ powders: Characterization of the contribution of the mechanical activation and postmilling calcination phenomena

Tetragonality enhancement in BaTiO₃ by mechanical activation of the starting BaCO₃ and TiO₂ powders: Characterization of the contribution of the mechanical activation and postmilling calcination phenomena