Defect chemistry in ferroelectric perovskites: long standing issues and recent advances

Maglione, Mario; Philippot, Gilles; Levasseur, D.; Payan, Sandrine; Aymonier, Cyril; Elissalde, Catherine

doi:10.1039/c5dt01897h

Cited by 22 publications

(22 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Defected and impurities implanted (doping) perovskites have been studied intensively. A 1-x B x TiO 3-y (Where A and B are transition or alkali metals; A≠B) type materials are synthesised by physical as well as chemical methods in earlier studies 11 – 26 . Despite the fact that perovskite nanomaterials have been extensively investigated over the past decade, to the best of our knowledge, the fabrication of A-site void xA-A 1-x TiO 3-y type nanocomposite by electron beam irradiation, surface characteristics and its formation mechanism has not been described thus far.…”

Section: Introductionmentioning

confidence: 99%

Designing of metallic nanocrystals embedded in non-stoichiometric perovskite nanomaterial and its surface-electronic characteristics

Suriyaprakash

Zhu

et al. 2017

Sci Rep

View full text Add to dashboard Cite

Engineering of novel functional nanocomposite as like as the metallic nanocrystals supported non-stoichiometric perovskite nanomaterial in controlled parameters (size, shape and ratio of chemical characteristics) is a challengeable task. In this context, we present a facile route to fabricate and study its physicochemical property at real time mode in this report. Nanoscale pure Pb crystals surfaced on non-stoichiometric A-site deficient Pb1-xTiO3-y nanoparticle were fabricated when a precursor lead titanate (PbTiO3) nanoparticle was exposed to an electron beam irradiation (EBI) in a transmission electron microscope (TEM) at ambient temperature. In the state of the art, the chemical states and electronic structure of non-irradiated and irradiated PbTiO3 were studied by X-ray photoelectron spectroscopy (XPS). Electron bombardment resulted in a new visible feature at low binding energy in the Pb 4f core level, while Ti 2p and O 1s line shape showed slight changes. The Fermi level of the corresponding materials was determined to be 1.65 ± 0.1 eV and 2.05 ± 0.1 eV above the valence band maximum, respectively. The normal, weakly p-type PTO exhibits peculiar n-type feature after EBI process (The Fermi level moves near to the conduction band). A feasible mechanism is proposed involving the electron-stimulated local bond-breaking phenomenon in PbTiO3.

show abstract

Section: Introductionmentioning

confidence: 99%

Designing of metallic nanocrystals embedded in non-stoichiometric perovskite nanomaterial and its surface-electronic characteristics

Suriyaprakash

Zhu

et al. 2017

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The major issue when designing tailor-made nanostructured ferroelectric materials is the control of the interfaces in a broad sense i.e. 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].…”

Section: Methodsmentioning

confidence: 99%

“…A post-sintering annealing under air in the temperature range 700 -1000 °C is thus mandatory to minimize oxygen vacancies associated with the reduction of titanium Ti 4+ into Ti 3+ and to recover insulating properties (Ti 3+ into Ti 4+ ). The defect chemistry at the grain boundaries is then hardly fully mastered, in particular in nanostructured ceramics [10,26]. The combination of low temperature and inert atmosphere enabled to obtain BT@SiO2 ceramics exhibiting high stability of permittivity over a wide temperature range and low dielectric losses at low frequency (0.5% at 10 kHz).…”

Section: Silica Based Core-shell Nanocompositesmentioning

confidence: 99%

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

et al. 2018

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…This result supports the accuracy in terms of composition control of the supercritical fluid technology for BTZ synthesis. In addition, the structural -OH defects observed are characteristic of wet syntheses and can impact the material properties [48].…”

Section: Compositionmentioning

confidence: 99%

Continuous BaTi1−yZryO3 (0≤y≤1) nanocrystals synthesis in supercritical fluids for nanostructured lead-free ferroelectric ceramics

et al. 2015

View full text Add to dashboard Cite

Defect chemistry in ferroelectric perovskites: long standing issues and recent advances

Cited by 22 publications

References 43 publications

Designing of metallic nanocrystals embedded in non-stoichiometric perovskite nanomaterial and its surface-electronic characteristics

Designing of metallic nanocrystals embedded in non-stoichiometric perovskite nanomaterial and its surface-electronic characteristics

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

Continuous BaTi1−yZryO3 (0≤y≤1) nanocrystals synthesis in supercritical fluids for nanostructured lead-free ferroelectric ceramics

Contact Info

Product

Resources

About