Effect of configuration entropy on dielectric relaxor, ferroelectric properties of high-entropy (NaBiBa)x(SrCa)(1-3x)/2TiO3 ceramics

Shang, Yangchao; Pu, Yongping; Zhang, Qianwen; Zhang, Lei; Zhang, Xian; Zhang, Jinbo; Ning, Yating

doi:10.1007/s10854-022-07731-x

Cited by 22 publications

(11 citation statements)

References 49 publications

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“…Ramachandra Munikoti and Keigo Suzuki et al studied the performance degradation of different products by using a high accelerated life test and obtained different performance degradation results under different aging conditions. , Based on the above, at present, in the field of rare-earth doped SrTiO 3 colossal permittivity ceramics, researchers usually mention superficially that the generation of colossal permittivity and resistance degradation are closely related to the oxygen vacancy. Still, there are few discussions about how the oxygen vacancy acts in the ceramic, namely, the generation, migration, and annihilation of the oxygen vacancy. , …”

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

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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.

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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

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“…The loss tangent remained remarkably low (<0.015) from room temperature to 125 • C, attributed to the presence of polar nano-regions with a short relaxation time resulting from the high atomic disorder induced by the high-entropy effect in the A-sites. 55 Pu et al 41,56,57 successfully synthesized (Na 0.2 Bi 0.2 Ba 0.2 Sr 0.2 Ca 0.2 )TiO 3 highentropy ceramics and investigated their energy storage properties. Results indicate that the discharge energy density achieves 1.02 J/cm 3 under the electric field strength of 145 kV/cm, which is improved to 1.56 J/cm 3 by incorporating 0.5 wt% Mn 2+ .…”

Section: Research Status Of High-entropy Energy Storage Dielectric Ce...mentioning

confidence: 99%

“…Researchers continue to explore novel ways to enhance the tunability and functionality of relaxor ferroelectrics through the control of configuration entropy. 56,78 The (NaBiBa) x (SrCa) (1−3x)/2 TiO 3 (x = 0.18-0.22) high-entropy ceramics have been investigated for their ferroelectric properties, and the results have revealed significant achievements in terms of polarization. A high maximum polarization of P m ∼ 16.59 µC/cm 2 and the residual polarization of P r ∼ 1.44 µC/cm 2 was obtained under the external electric field of 100 kV/cm with x = 0.21.…”

Section: Ferroelectric Ceramicsmentioning

confidence: 99%

“…The loss tangent remained remarkably low (<0.015) from room temperature to 125°C, attributed to the presence of polar nano‐regions with a short relaxation time resulting from the high atomic disorder induced by the high‐entropy effect in the A‐sites 55 . Pu et al 41,56,57 . successfully synthesized (Na 0.2 Bi 0.2 Ba 0.2 Sr 0.2 Ca 0.2 )TiO 3 high‐entropy ceramics and investigated their energy storage properties.…”

Section: Energy Storage Dielectric Ceramicsmentioning

confidence: 99%

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A review on structure–property relationships in dielectric ceramics using high‐entropy compositional strategies

et al. 2023

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High‐entropy strategy is a design that uses multiple elements to increase configurational entropy. As an emerging research field, high‐entropy was originally applied to metals, but it has shown great potential in inorganic nonmetallic materials. Since the first discovery of colossal dielectric permittivity in high‐entropy ceramics, it indicates that the high‐entropy strategy is feasible in dielectric ceramics. The multi‐ion solid solution will bring a broader space for the material structure and property tailoring. With the research of domestic and foreign scholars in high‐entropy dielectrics, we believe that entropic engineering can effectively regulate dielectric properties. The review paper explores the potential of the high‐entropy strategy in dielectric ceramics. It provides a detailed overview of the structural properties and the potential benefits of utilizing high‐entropy materials in dielectric ceramics. The review also covers the current research advancements in the field and provides insights into future directions for further development of high‐performance dielectric ceramics.

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“…Among the typical perovskite oxides, barium titanate (BaTiO 3 ) has been widely applied in piezoelectric [ 24 , 25 ], dielectric [ 26 , 27 , 28 ], and ferroelectric fields [ 29 , 30 , 31 ], so the high-entropy perovskite oxides (HEPOs) based on BaTiO 3 have obtained much attention [ 32 , 33 ]. Jiang et al designed a series of B-site HEPOs with a cubic phase and proposed that the phase stability of a single cubic solid solution was related to the tolerance factor [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

The Formation and Phase Stability of A-Site High-Entropy Perovskite Oxides

et al. 2023

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High entropy perovskite oxides (HEPOs) were a class of advanced ceramic materials, which had attracted much scientific attention in recent years. However, the effect of factors affecting the phase stability of high entropy perovskite oxides was still controversial. Herein, 17 kinds of A-site HEPOs were synthesized by solid-state methods, and several criteria for the formation of HEPOs and phase stability were investigated. Single-phase solid solutions were synthesized in 12 kinds of subsystems. The results show that the phase stability of a single-phase solid solution was affected by the size disorder and configurational entropy. The electronegativity difference was the key parameter to predict the evolution of the cubic/tetragonal phase, rather than the tolerance factor. Cubic HEPOs were easily formed when the electronegativity difference was <0.4, while the tetragonal HEPOs were easily formed when the electronegativity difference was ≥0.4. This study can further broaden the family of HEPOs and is expected to design the phase stability of HEPOs through electronegativity difference.

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Effect of configuration entropy on dielectric relaxor, ferroelectric properties of high-entropy (NaBiBa)x(SrCa)(1-3x)/2TiO3 ceramics

Cited by 22 publications

References 49 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

A review on structure–property relationships in dielectric ceramics using high‐entropy compositional strategies

The Formation and Phase Stability of A-Site High-Entropy Perovskite Oxides

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Effect of configuration entropy on dielectric relaxor, ferroelectric properties of high-entropy (NaBiBa)x(SrCa)(1-3x)/2TiO3 ceramics

Cited by 22 publications

References 49 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

A review on structure–property relationships in dielectric ceramics using high‐entropy compositional strategies

The Formation and Phase Stability of A-Site High-Entropy Perovskite Oxides

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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