Microstructural and electrical properties of CaTiO3–CaCu3Ti4O12 ceramics

Wang, Chih–Ming; Lin, Shu-Wei; Kao, K. C.; Chen, Ying–Chung; Weng, Shang-Chih

doi:10.1016/j.jallcom.2009.10.216

Cited by 43 publications

(11 citation statements)

References 28 publications

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“…While others prefer to attribute it to some extrinsic factors, such as the material microstructure (such as grain size) [7,8], processing conditions (such as sintering temperature and time, cooling rate, etc.) [7][8][9], twin crystals [1], an internal barrier layer capacitance (IBLC) model in which the ceramic is supposed to consist of n-type semiconductive grains and insulating grain or domain boundaries [5,10,11], internal domains inside CCTO grains [11,12], electrode polarization effects [13], a multipole trap charge repositioning model [14,15] and so on. Contact electrode depletion effect [13] and other similar behavior termed Maxwell-Wagner relaxation [16] were also proposed and generally accepted.…”

Section: Introductionmentioning

confidence: 99%

Microstructures and electrical responses of pure and chromium-doped CaCu3Ti4O12 ceramics

Zheng

Fan

Long

2012

Journal of Alloys and Compounds

100

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Section: Introductionmentioning

confidence: 99%

Microstructures and electrical responses of pure and chromium-doped CaCu3Ti4O12 ceramics

Zheng

Fan

Long

2012

Journal of Alloys and Compounds

100

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“…We also notice that not all the high-permittivity materials (e.g. CaCu 3 Ti 4 O 12 system with ε r > 5000013141516) are suitable for energy storage application, because they are required to withstand considerable voltage and exhibit low dielectric loss. Therefore, the scope of this paper will focus on the high-permittivity ferroelectric material with relatively low conductivity.…”

mentioning

confidence: 99%

Enhancing dielectric permittivity for energy-storage devices through tricritical phenomenon

Gao

Wang

Liu

et al. 2017

Sci Rep

111

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Although dielectric energy-storing devices are frequently used in high voltage level, the fast growing on the portable and wearable electronics have been increasing the demand on the energy-storing devices at finite electric field strength. This paper proposes an approach on enhancing energy density under low electric field through compositionally inducing tricriticality in Ba(Ti,Sn)O3 ferroelectric material system with enlarged dielectric response. The optimal dielectric permittivity at tricritical point can reach to εr = 5.4 × 104, and the associated energy density goes to around 30 mJ/cm3 at the electric field of 10 kV/cm, which exceeds most of the selected ferroelectric materials at the same field strength. The microstructure nature for such a tricritical behavior shows polarization inhomogeneity in nanometeric scale, which indicates a large polarizability under external electric field. Further phenomenological Landau modeling suggests that large dielectric permittivity and energy density can be ascribed to the vanishing of energy barrier for polarization altering caused by tricriticality. Our results may shed light on developing energy-storing dielectrics with large permittivity and energy density at low electric field.

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“…6(d)]. This value of relaxation time is several orders of magnitude greater than that calculated using Maxwell-Wagner relation (s ¼ 4 p e e o =r, where r is the electrical conductivity of CCTO $10 À9 (Xcm) À1 , 44 and e ¼ 10 4 , therefore, the relaxation time based on this relation is $1 s). This indicates that the locally induced charged states decay with the characteristic time that is many orders of magnitude greater than the charge relaxation and might be attributed to induced ferroelectric polarization.…”

Section: Resultsmentioning

confidence: 77%

Nanoscale electromechanical properties of CaCu3Ti4O12 ceramics

Tararam

Bdikin

Panwar

et al. 2011

Journal of Applied Physics

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Piezoresponse Force Microscopy (PFM) is used to characterize the nanoscale electromechanical properties of centrosymmetric CaCu 3 Ti 4 O 12 ceramics with giant dielectric constant. Clear PFM contrast both in vertical (out-of-plane) and lateral (in-plane) modes is observed on the ceramic surface with varying magnitude and polarization direction depending on the grain crystalline orientation. Lateral signal changes its sign upon 180 rotation of the sample thus ruling out spurious electrostatic contribution and confirming piezoelectric nature of the effect. Piezoresponse could be locally reversed by suitable electrical bias (local poling) and induced polarization was quite stable showing long-time relaxation ($3 hrs). The electromechanical contrast in unpoled ceramics is attributed to the surface flexoelectric effect (strain gradient induced polarization) while piezoresponse hysteresis and ferroelectric-like behavior are discussed in terms of structural instabilities due to Ti off-center displacements and structural defects in this material.

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Microstructural and electrical properties of CaTiO3–CaCu3Ti4O12 ceramics

Cited by 43 publications

References 28 publications

Microstructures and electrical responses of pure and chromium-doped CaCu3Ti4O12 ceramics

Microstructures and electrical responses of pure and chromium-doped CaCu3Ti4O12 ceramics

Enhancing dielectric permittivity for energy-storage devices through tricritical phenomenon

Nanoscale electromechanical properties of CaCu3Ti4O12 ceramics

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