Study of electrocaloric effect in barium titanate nanoparticle with core–shellmodel

Chen, Xiqu; Fang, Chao

doi:10.1016/j.physb.2013.01.033

Cited by 28 publications

(17 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…other ferroelectric materials [4][5][6] in which |∆T | has a peak at T C . By increasing the applied fields (> 100 kV/cm) the range of applicable temperatures broadens as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Direct Molecular Dynamics Simulation of Electrocaloric Effect in BaTiO₃

2013

View full text Add to dashboard Cite

The electrocaloric effect (ECE) in BaTiO3 is simulated using two different first-principles based effective Hamiltonian molecular dynamics methods. The calculations are performed for a wide range of temperatures (30-900 K) and external electric fields (0-500 kV/cm). As expected, a large adiabatic temperature change, ∆T , at the Curie temperature, TC, is observed. It is found that for single crystals of pure BaTiO3, the temperature range where a large ∆T is observed is narrow for small external electric fields (< 50 kV/cm). Large fields (> 100 kV/cm) may be required to broaden the effective temperature range. The effect of crystal anisotropy on the ECE ∆T is also investigated. It is found that applying an external electric field along the [001] direction has a larger ECE than those along the [110] and [111] directions.

show abstract

“…other ferroelectric materials [4][5][6] in which |∆T | has a peak at T C . By increasing the applied fields (> 100 kV/cm) the range of applicable temperatures broadens as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Direct Molecular Dynamics Simulation of Electrocaloric Effect in BaTiO₃

2013

View full text Add to dashboard Cite

show abstract

“…Fig. This outcome is the significant advantage of the present method in contrast to other established methods [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Since the characteristic bands of the carbonates (867, 1049, 1421 cm −1 ) [23] have not been appeared in our spectrum, it can be stated that the synthesized nanocrystals are carbonate-free and thus highly pure.…”

Section: Materials and Synthesis Methodsmentioning

confidence: 55%

“…Barium titanate (BaTiO 3 ; BTO) is the most common perovskite ferroelectric material, which has been studied extensively because of its wide band gap and outstanding dielectric and ferroelectric properties [5][6][7][8][9][10][11]. A large number of researches regarding the synthesis of nanoscale BTO crystals using different synthesis methods are available in the literature [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].The BTO synthesis pathways reported in the last years can be divided into (1) solid state reaction methods such as mixed oxide method [18][19], and (2) wet-chemical methods such as sol-gel, precipitation, hydrothermal and sonochemical processing methods [5][6][7][8][9][10][11][12][13][14][15][16][17][20][21][22][23]. A large number of researches regarding the synthesis of nanoscale BTO crystals using different synthesis methods are available in the literature [5][6]…”

Section: Introductionmentioning

confidence: 99%

Obtaining a novel crystalline/amorphous core/shell structure in barium titanate nanocrystals by an innovative one-step approach

Ashiri

2015

RSC Adv.

View full text Add to dashboard Cite

Synthesis temperature and purity of core/shell nanocrystals are key challenges facing the scientific community. Moreover, the core/shell structures usually need a multi-step synthesis pathway to be fabricated. This work aims to address these challenges by developing an innovative one-step synthesis pathway for obtaining carbonate-free BaTiO 3 core/shell nanocrystals at low temperature. The results show that very fine BaTiO 3 core/shell nanocrystals (<11 nm) free from any by-products such as BaTi 2 O 5 and BaCO 3 are synthesized at 323 K (50 °C). This newly developed structure can significantly reduce the sintering temperature of the nanocrystals and can be beneficial in fabricating the ceramic parts at lower sintering temperatures. 3 significantly change its dielectric behavior and turn dielectric nature of BTO to semiconducting one [21].Facile strategies for nanocrystals synthesis are of fundamental importance in the advancement of nanoscience and nanotechnology. In this work, it has been tried to develop and describe a new methodology for the synthesis of carbonate-free BTO nanocrystals. This methodology provides a one-step, convenient, low-cost, nontoxic, and mass-productive route for the synthesis of BTO nanocrystals. On the other hand, BTO is conventionally obtained by solidstate synthesis between barium carbonate (BaCO 3 ) and titania (TiO 2 ) at 1473 K (1200°C) [18][19]. Some wet chemical approaches need a calcination process at temperatures above 973 K (700°C) [11]. The products of these methods contain some inhomogenities and by-products [13,16]. As the great advance made by this work, our method of synthesis is able to obtain high-quality homogenous carbonate-free BTO nanocrystals at a low temperature of 323 K (50 °C).Core-shell nanostructures have recently received much attention for their enhanced properties and performances [24][25][26][27]. Moreover, the core-shell structures are normally chosen believing that these can cause a better coupling between the two phases. In this work, a new family of core-shell structure is developed which the core and shell have similar composition while core are crystalline and shell is amorphous. Moreover, for the first time, the novel core/shell nanostructures are obtained by a one-step synthesis method. On theother hand, obtaining nanocrystalline ceramic parts from their nanopowders is one of the most important challenges facing the scientific communities since the high temperature of the sintering process results in particle growth and as the consequence; the final structure becomes submicron-sized. When the shell is amorphous, this layer absorbs thermal energy to become crystalline and thus the required energy for particle growth cannot be provided. TheIn stage (i), the decarbonation treatments of deionized water are performed in three stages including boiling at 373 K (100 °C) for 30 min, bubbling with Ar gas for 30 min and increasing the pH of deionized water above pH 8.5. This three-stage process leads to removal of the carbon species and dissolved CO 2 gas fr...

show abstract

“…[370] In terms of nanoparticle work, a quantitative core-shell structure model was developed to study the grain size effects on the EC performance of BaTiO 3 nanoparticles. [371] The effect of intrinsic surface tension and domain wall contribution in influencing giant adiabatic temperature change (|ΔT| = 5.8 K) in PbTiO 3 nanoparticle with vortex domain structure has been studied using a phase-field model combined with thermodynamics analysis. [77,372] Low-dimensional PZT materials have been studied using first principles.…”

Section: Theoretical Predictions On Caloric Oxidesmentioning

confidence: 99%

Caloric Effects in Perovskite Oxides

Barman

Kar‐Narayan

Mukherjee

2019

Adv Materials Inter

View full text Add to dashboard Cite

Perovskite oxides show an amazing diversity of electronic and magnetic properties along with a myriad of structural variants and phase transitions. Large thermal changes may be driven near the ferroic phase transitions in perovskite oxides using magnetic, electric, and stress fields to manipulate conjugate order parameters. The ensuing magnetocaloric, electrocaloric, and mechanocaloric effects can be utilized for environment‐friendly and high‐efficiency solid‐state cooling applications. In this review the details of these caloric effects in perovskite oxides both from a chronological perspective and from the viewpoint of the recent advances in multiple caloric phenomena are described. The authors highlight the role of interfaces in oxide thin films for the different caloric effects and address some of the outstanding challenges for the fundamental understanding and practical implementation of perovskite oxides in solid state refrigeration.

show abstract

Study of electrocaloric effect in barium titanate nanoparticle with core–shellmodel

Cited by 28 publications

References 31 publications

Direct Molecular Dynamics Simulation of Electrocaloric Effect in BaTiO₃

Direct Molecular Dynamics Simulation of Electrocaloric Effect in BaTiO₃

Obtaining a novel crystalline/amorphous core/shell structure in barium titanate nanocrystals by an innovative one-step approach

Caloric Effects in Perovskite Oxides

Contact Info

Product

Resources

About

Study of electrocaloric effect in barium titanate nanoparticle with core–shellmodel

Cited by 28 publications

References 31 publications

Direct Molecular Dynamics Simulation of Electrocaloric Effect in BaTiO3

Direct Molecular Dynamics Simulation of Electrocaloric Effect in BaTiO3

Obtaining a novel crystalline/amorphous core/shell structure in barium titanate nanocrystals by an innovative one-step approach

Caloric Effects in Perovskite Oxides

Contact Info

Product

Resources

About

Direct Molecular Dynamics Simulation of Electrocaloric Effect in BaTiO₃

Direct Molecular Dynamics Simulation of Electrocaloric Effect in BaTiO₃