Core‐Shell Heterostructures: From Particle Synthesis to Bulk Dielectric, Ferroelectric, and Multiferroic Composite Materials

Buscaglia, Vincenzo; Buscaglia, María Teresa

doi:10.1002/9781118935743.ch3

Cited by 5 publications

(4 citation statements)

References 110 publications

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“…Therefore, new functionalities can be imparted to the cores depending on the properties of the shell. Although, in some multiferroic BaTiO 3 based core/shell structures such as CoFe 2 O 4 /BaTiO 3 , BaTiO 3 can act as a shell, it has been found that in some other core/shell composites, BaTiO 3 may act as a nucleous for the shell formation as well [32,33]. In the case of the BTF1 sample, the last conclusion could be also made even just for the ferrimagnetic phases and therefore it could be assumed that the particles of BaTiO 3 act as nucleus centers for synthesis of ferrimagnetic phases and promote their formation.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of BaTiO3/α-Fe2O3 core/shell structure

et al. 2019

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Multiferroic materials attracted a lot of attention in recent years because of their significant scientific interest and technological applications. The multiferroic core/shell powders have a better connectivity between the phases, resulting in superior dielectric and magneto electric properties. In this study, the influence of preparation condition on structure and properties of BaTiO 3 /α-Fe 2 O 3 core/shell composite materials was examined. The five samples were obtained by varying synthesis conditions, such as synthesized method (co-precipitation and sonochemical method) and pH values of solution. XRD and Raman spectroscopy analyses were performed in order to determine phase composition and structural changes within samples. Morphology modifications were examined by SEM and EDS analyses. Finally, effect of structural and microstructural changes on magnetic and electrical properties was detected and explained.

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Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of BaTiO3/α-Fe2O3 core/shell structure

et al. 2019

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“…Due in part to their inherent scalability, hydrothermal synthesis methods were utilized in this work to deposit BaTiO 3 films on carbon fiber woven fabrics (Hexcel, IM7). Using a procedure established in prior research and described in further detail in the Experimental Methods section, woven carbon fiber fabrics were coated with a conformal layer of BaTiO 3 . ,,− The synthesis procedure is a two-step hydrothermal reaction that is schematically illustrated in Figure a. This two-step reaction initially creates a textured film of rutile TiO 2 on the carbon fiber surface during the first hydrothermal reaction step.…”

Section: Resultsmentioning

confidence: 99%

Barium Titanate Film Interfaces for Hybrid Composite Energy Harvesters

Bowland

Malakooti

Sodano

2017

ACS Appl. Mater. Interfaces

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Energy harvesting utilizing piezoelectric materials has become an attractive approach for converting mechanical energy into electrical power for low-power electronics. Structural composites are ideally suited for energy scavenging due to the large amount of mechanical energy they are subjected to. Here, a multifunctional composite with embedded sensing and energy harvesting is developed by integrating an active interface into carbon fiber reinforced polymer composites. By modifying the composite matrix, both rigid and flexible multifunctional composites are fabricated. Through electromechanical testing of a cantilever beam of the rigid composite, it reveals a power density of 217 pW/cc from only 1 g root-mean-square acceleration when excited at its resonant frequency of 47 Hz. Electromechanical sensor testing of the flexible multifunctional composite reveals an average voltage generation of 23.5 mV/g at its resonant frequency of 96 Hz. This research introduces a route for integrating nonstructural functionality into structural fiber composites by utilizing BaTiO coated woven carbon fiber fabrics with power scavenging and passive sensing capabilities.

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“…charged interfaces, grain boundaries, interphases between different components [10]. Through an overview of recent results, we will underline the progresses made in the synthesis of nanoscale-designed ferroelectric particles, ceramics and composites [6,11]. In particular, promising wet chemical routes (seed growth process, thermolysis, supercritical fluid synthesis) to control stoichiometry, crystallinity, surface reactivity and functionalization will be emphasized.…”

Section: Methodsmentioning

confidence: 99%

“…Buscaglia [11]. As an example, the combination of size effects and local composition gradients has led to nanoceramics exhibiting reasonable tunability, moderate dielectric losses and flat temperatureindependent permittivity [19].…”

Section: Nanoscale-designed Ferroelectric Particles and Fast Sinterinmentioning

confidence: 99%

Specific core-shell approaches and related properties in nanostructured ferroelectric ceramics

et al. 2018

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Interfaces are a major issue when designing ferroelectric nanostructured materials with tailored properties. In a context of integration and multifunctionality in the field of electronics, several strategies have been developed to control the microstructure and defect chemistry of interfaces that strongly impact the macroscopic properties. The suitability of the core-shell approaches that allow a subtle tuning of interface phenomena at different scales has been widely demonstrated. We focus here on the flexibility of the core-shell approach devoted to the processing of nanostructured ferroelectric composites. Our strategy relies on the use of advanced synthesis processes to design ferroelectric grains coated with shells of different nature, morphology and crystallinity. Typical examples will be reviewed with a specific attention on their impact on both microstructure and dielectric properties. Our approach, based also on the use of fast sintering technique, provides a guidance to design 3D bulk nanostructured ferroelectrics while controlling and/or exploiting size, interface and defects chemistry. The contribution of specific spectroscopies to probe interfacial chemistry and defects is underlined. The high density of interfaces in core-shell materials is obviously an advantage to target additional functionality such as magneto-electric coupling. This is illustrated in 3D composites and one dimensional nanostructures that coaxially combine electric and magnetic materials. The core-shell approach described here could be transferred to a much broader range of materials covering many functionalities provided a deeper understanding of the interfaces at the atomic scale is achieved and a further development of low temperature processing is reached.

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Core‐Shell Heterostructures: From Particle Synthesis to Bulk Dielectric, Ferroelectric, and Multiferroic Composite Materials

Cited by 5 publications

References 110 publications

Synthesis and characterization of BaTiO3/α-Fe2O3 core/shell structure

Synthesis and characterization of BaTiO3/α-Fe2O3 core/shell structure

Barium Titanate Film Interfaces for Hybrid Composite Energy Harvesters

Specific core-shell approaches and related properties in nanostructured ferroelectric ceramics

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