Direct current field induced asymmetrical DC-resistivity degradation in SrTiO3-based grain boundary layer ceramic

He, Fan; Liu, Ming; Lu, Minghui; Cao, Lushuai; Wang, Qingran; Li, Ruqiang; Ding, Mengqi

doi:10.1016/j.ceramint.2019.03.131

Cited by 6 publications

(2 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, they are usually accompanied by high dielectric loss (>0.05). The materials undergo degradation in high electric fields, high temperature, and other environments, resulting in the aging of electronic equipment, failure, and lower service life and limiting industrial uses. ,− …”

Section: Introductionmentioning

confidence: 99%

Simultaneously Achieving Colossal Permittivity, Ultralow Dielectric Loss Tangent, and High Insulation Resistivity in Er-Doped SrTiO₃ Ceramics via Oxygen Vacancy Regulation

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

High-performance Sr1–x Er x TiO3 (x = 0–0.014) ceramics were sintered in different atmospheres using the conventional solid-state reaction method. The phase structure and micromorphology of ceramics were analyzed using X-ray diffraction and scanning electron microscopy. Meanwhile, the Sr1–x Er x TiO3 (when x = 0.012) ceramic sintered in hydrogen attains a colossal permittivity (132 543 @1 kHz, 157 650 @1 MHz) and ultralow tan δ (0.009 @1 kHz, 0.03 @1 MHz) and has good frequency stability (20 Hz to 2 MHz) and temperature stability (−180 to 425 °C). X-ray photoelectron spectroscopy, electron paramagnetic resonance, and impedance analysis show that the colossal permittivity and ultralow dielectric loss are attributed to the defect dipoles and defect clusters [TiTi ′–VO ••–TiTi ′], [ErSr •–TiTi ′], [2ErTi ′–VO ••], and [ErSr •–ErTi ′]. The insulation resistivity is determined by the grain boundary. The dielectric properties of samples sintered in hydrogen are excellent, and then, the oxidation method is used to backfill the oxygen vacancy (VO ••), thus improving the insulation resistivity (2.8 × 1014 Ω cm) of the grain boundary. In addition, the diffusion mechanism of ceramic VO •• from low, medium, and high temperatures was studied by monitoring VO •• behavior in real time. The results reveal that the diffusion coefficient of VO •• in the grain boundary is greater than that in the grain; as a result, as the external oxygen partial pressure rises, the VO •• escapes first from the grain boundary. When the external oxygen partial pressure decreases, oxygen atoms enter the grain boundary region first and backfill oxygen vacancies.

show abstract

Section: Introductionmentioning

confidence: 99%

Simultaneously Achieving Colossal Permittivity, Ultralow Dielectric Loss Tangent, and High Insulation Resistivity in Er-Doped SrTiO₃ Ceramics via Oxygen Vacancy Regulation

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…Among the different structures of perovskites, those of the ATiO 3 type (A � Ca, Ba, Sr, etc.) are the most interesting due to their optical and electronic properties [6,7]. Perovskites have high tolerance to metal substitution in their crystalline structure, excellent thermal stability, and resistance to sintering of substituted metals [8].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Europium Retention in Perovskite: Potential Candidates for an Engineering Barrier in the Disposal of Radioactive Waste

Ortiz-Oliveros

Espinosa

Ávila-Pérez

et al. 2021

Journal of Chemistry

View full text Add to dashboard Cite

Perovskites, such as tausonite, are crystalline metal oxides with excellent optical and photocatalytic properties and have also been used successfully in the retention of metals, simulating the isotopes of uranium and plutonium. In this work, different pseudo-order and thermodynamic models were studied to achieve the prediction of the sorption of Eu3+ (chemical analogous for actinides) in tausonite. The effects of gamma irradiation and temperature on the structural characteristics of the material were determined, as an additional step in the evaluation of material as an engineering barrier in the disposal of radioactive waste. The results obtained show that the tausonite is resistant to the gamma irradiation and thermal energy. Likewise, it was possible to determine that europium sorption occurs through an exothermic and spontaneous reaction, as well as through the formation of surface complexes, where Eu3+ ions bind to sites on the tausonite by dipole-dipole interaction. Furthermore, it was shown that the sorption mechanism is influenced by diffusive phenomena, which participate in the formation of surface complexes. Additionally, a new sorption model with respect to pH was proposed, which allowed determining the physical parameter π. The evidence obtained suggests that π is a physical parameter that relates pH to an optimal value and could explain the equilibrium between the surface complexes that tausonite forms with europium. Likewise, the evidence suggests that 50 kg of tausonite would have the capacity to retain at least 26.59 g of alpha-emitting radionuclides, equivalent to a waste package (900 kg) with a maximum activity of 4000 Bq/g.

show abstract

Novel 2D SnNb2O6/Ag3VO4 S-scheme heterojunction with enhanced visible-light photocatalytic activity

Zhang

et al. 2021

Ceramics International

View full text Add to dashboard Cite

Direct current field induced asymmetrical DC-resistivity degradation in SrTiO3-based grain boundary layer ceramic

Cited by 6 publications

References 11 publications

Simultaneously Achieving Colossal Permittivity, Ultralow Dielectric Loss Tangent, and High Insulation Resistivity in Er-Doped SrTiO₃ Ceramics via Oxygen Vacancy Regulation

Simultaneously Achieving Colossal Permittivity, Ultralow Dielectric Loss Tangent, and High Insulation Resistivity in Er-Doped SrTiO₃ Ceramics via Oxygen Vacancy Regulation

Prediction of Europium Retention in Perovskite: Potential Candidates for an Engineering Barrier in the Disposal of Radioactive Waste

Novel 2D SnNb2O6/Ag3VO4 S-scheme heterojunction with enhanced visible-light photocatalytic activity

Contact Info

Product

Resources

About

Direct current field induced asymmetrical DC-resistivity degradation in SrTiO3-based grain boundary layer ceramic

Cited by 6 publications

References 11 publications

Simultaneously Achieving Colossal Permittivity, Ultralow Dielectric Loss Tangent, and High Insulation Resistivity in Er-Doped SrTiO3 Ceramics via Oxygen Vacancy Regulation

Simultaneously Achieving Colossal Permittivity, Ultralow Dielectric Loss Tangent, and High Insulation Resistivity in Er-Doped SrTiO3 Ceramics via Oxygen Vacancy Regulation

Prediction of Europium Retention in Perovskite: Potential Candidates for an Engineering Barrier in the Disposal of Radioactive Waste

Novel 2D SnNb2O6/Ag3VO4 S-scheme heterojunction with enhanced visible-light photocatalytic activity

Contact Info

Product

Resources

About

Simultaneously Achieving Colossal Permittivity, Ultralow Dielectric Loss Tangent, and High Insulation Resistivity in Er-Doped SrTiO₃ Ceramics via Oxygen Vacancy Regulation

Simultaneously Achieving Colossal Permittivity, Ultralow Dielectric Loss Tangent, and High Insulation Resistivity in Er-Doped SrTiO₃ Ceramics via Oxygen Vacancy Regulation