Dielectric properties and nonlinear I–V electrical behavior of (Li1+, Al3+) co-doped CaCu3Ti4O12 ceramics

Sun, Li; Ni, Qing; Jun, Guo; Cao, Ensi; Hao, Wentao; Ju, Lin

doi:10.1007/s00339-018-1862-4

Cited by 33 publications

(22 citation statements)

References 36 publications

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“…The ε ′ values decrease with increasing number of (Li + , F − ) co‐dopant ions, which is similar to the behavior reported in Y 3+ ‐ and Sc 3+ ‐doped CCTO ceramics . However, this observation is unlike to that found in most other reports, in which the dielectric response of CCTO usually increases with increasing mean grain size . According to the Maxwell‐Wagner (M‐W) polarization model, the ε ′ is dependent on the capacitance at the GBs ( C gb ) .…”

Section: Resultssupporting

confidence: 80%

“…Recently, giant dielectric materials belonging to the family of ACu 3 Ti 4 O 12 compounds have generated considerable interest due to their potential applications for the miniaturization of microelectronic devices, for example, multilayer ceramic capacitors. CaCu 3 Ti 4 O 12 (CCTO) is a popular material among the ACu 3 Ti 4 O 12 compounds because it exhibits a very large dielectric permittivity ( ε ′ ~10 4 ) over a wide temperature range without a detectable phase transition in the temperature range of 35‐100 K . However, a structural phase transition occurred in CCTO ceramics at 726‐732 K .…”

Section: Introductionmentioning

confidence: 99%

“…However, many intrinsic effects that occur at the crystal structure level have been proposed to describe the unusual tremendous dielectric response . Interestingly, CCTO polycrystalline ceramics also show a nonlinear current‐voltage ( J ‐ E ) characteristic . According to the extrinsic model, the dielectric behavior from each point of view should be reasonably explained by the IBLC model, while the overall dielectric properties should be controlled by improving the electrical properties of the semiconducting and insulating phases.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, research work should pay attention to reducing the low‐frequency tanδ value. One of the most effective methods to do this is to substitute doping cations or anions (F − into O 2− ) into the CCTO structure for enhancing the electrical properties of the insulating phase and the semiconducting phase . Generally, increasing the resistance of the insulating phase, for example, GB resistance ( R gb ) or internal interface resistance, can decrease the low‐frequency tanδ value .…”

Section: Introductionmentioning

confidence: 99%

“…According to previous reports, doping F − anions onto O 2− sites can play two critical roles: (a) increase the GB resistance due to the enhanced potential barrier height at the GBs and (b) increase the free electrons in the grain interior due to the charge compensation resulting from reducing Ti 4+ → Ti 3+ and/or Cu 2+ → Cu + . On the other hand, it was reported that a dense microstructure was achieved by adding or doping Li + onto the Cu site of CCTO ceramics, hence improving the IBLC microstructure . Although the dielectric properties of CCTO ceramics co‐doped with different cations on different sites of the crystal structure have been widely reported in recent years, there is no report for simultaneous cation and anion co‐doping into the CCTO crystal structure.…”

Section: Introductionmentioning

confidence: 99%

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Giant dielectric behavior of monovalent cation/anion (Li⁺, F⁻) co‐doped CaCu₃Ti₄O₁₂ ceramics

et al. 2019

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Giant dielectric behavior and electrical properties of monovalent cation/anion (Li+, F−) co‐doped CaCu3Ti4O12 ceramics prepared by a solid‐state reaction route were systematically investigated. Substitution of Li+ and F− led to a significantly enlarged mean grain size. A reduced loss tangent (tanδ ~0.06) with the retainment of an ultra‐high dielectric permittivity (ε′ ~7.7‐8.8 × 104) was achieved in the co‐doped ceramics, while the breakdown electric field and nonlinear coefficient of CaCu3Ti4O12 ceramics were increased by co‐doping with (Li+, F−). The variations in nonlinear electrical properties and giant dielectric response, as well as the dielectric relaxation, were well explained by the Maxwell‐Wagner polarization model for an electrically heterogeneous microstructure, in which a Schottky barrier height at the grain boundaries (GBs) was formed. ε′ was closely correlated to the GB capacitance. Significantly decreased tanδ value and enhanced nonlinear properties were related to a significant increase in the GB resistance, which was attributed to the significantly increased potential barrier height and conduction activation energy at the GBs. The semiconducting nature of the grains was also studied using X‐ray photoelectron spectroscopy and found to originate from the presence of Cu+ and Ti3+ ions.

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Section: Resultssupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Giant dielectric behavior of monovalent cation/anion (Li⁺, F⁻) co‐doped CaCu₃Ti₄O₁₂ ceramics

et al. 2019

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Colossal Permittivity Materials as Superior Dielectrics for Diverse Applications

Wang

Jie

Yang

et al. 2019

Adv Funct Materials

155

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Ever since the beginning of this century, many kinds of materials have been reported to demonstrate colossal permittivity (CP) or colossal dielectric constant exceeding 10 3 . Accordingly, such CP materials and their further modification and improvement to achieve enhanced CP performance for promising applications in modern electronics, sensors, energy storage, and multifunctional devices and so on have attracted extensive attention. In this review, 2 a general overview of the recent advances in CP materials is provided, ranging from their various categories, physical mechanisms, and modulation methods to promising applications.First, various classes of CP materials are categorized in terms of their structures and dielectric properties. Subsequently, this review provides an insight into the CP mechanisms in views of barrier layer capacitance, defect-dipole cluster and polaronic effect. Moreover, the strategies and prototypical works are introduced in some aspects, including the manipulation of CP properties by doping, percolative capacitors and the methods employed to enhance the dielectric behaviors in CP materials with different forms. We then discuss a wide range of applications based on CP materials, such as modern electronics and energy storage. Finally, the challenges and opportunities for further investigation of CP materials are highlighted in the summary and future perspectives.

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From Synthesis to Applications: Copper Calcium Titanate (CCTO) and its Magnetic and Photocatalytic Properties

et al. 2019

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Investigations focusing on electrical energy storage capacitors especially the dielectric ceramic capacitors for high energy storage density are attracting more and more attention in the recent years. Ceramic capacitors possess a faster charge‐discharge rate and improved mechanical and thermal properties compared with other energy storage devices such as batteries. The challenge is to obtain ceramic capacitors with outstanding mechanical, thermal and storage properties over large temperature and frequencies ranges. ABO 3 as a type of perovskites showed a strong piezoelectric, dielectric, pyroelectric, and electro‐optic properties useful as energy storage and environmental devices. CaCu 3 Ti 4 O 12 (CCTO) perovskite with cubic lattice (Im3 symmetry) was discovered to have a colossal dielectric constant (10 4 ) that is stable over a wide range of frequencies (10 Hz–1 MHz) and temperature independence (100–300 K). The origin of this high dielectric constant is not fully established, specially because it is the same for single crystal and thin films. In this review, the history of CCTO will be introduced. The synthesis and the sintering approaches, the dopant elements used as well as the applications of CCTO will be reported. In addition to dielectrical properties useful to energy storage devices; CCTO could serve as photocatalytic materials with a very good performance in visible light.

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Dielectric properties and nonlinear I–V electrical behavior of (Li1+, Al3+) co-doped CaCu3Ti4O12 ceramics

Cited by 33 publications

References 36 publications

Giant dielectric behavior of monovalent cation/anion (Li⁺, F⁻) co‐doped CaCu₃Ti₄O₁₂ ceramics

Giant dielectric behavior of monovalent cation/anion (Li⁺, F⁻) co‐doped CaCu₃Ti₄O₁₂ ceramics

Colossal Permittivity Materials as Superior Dielectrics for Diverse Applications

From Synthesis to Applications: Copper Calcium Titanate (CCTO) and its Magnetic and Photocatalytic Properties

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Dielectric properties and nonlinear I–V electrical behavior of (Li1+, Al3+) co-doped CaCu3Ti4O12 ceramics

Cited by 33 publications

References 36 publications

Giant dielectric behavior of monovalent cation/anion (Li+, F−) co‐doped CaCu3Ti4O12 ceramics

Giant dielectric behavior of monovalent cation/anion (Li+, F−) co‐doped CaCu3Ti4O12 ceramics

Colossal Permittivity Materials as Superior Dielectrics for Diverse Applications

From Synthesis to Applications: Copper Calcium Titanate (CCTO) and its Magnetic and Photocatalytic Properties

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Product

Resources

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Giant dielectric behavior of monovalent cation/anion (Li⁺, F⁻) co‐doped CaCu₃Ti₄O₁₂ ceramics

Giant dielectric behavior of monovalent cation/anion (Li⁺, F⁻) co‐doped CaCu₃Ti₄O₁₂ ceramics