The effect of segregation structure on the colossal permittivity properties of (La0.5Nb0.5)xTi1−xO2 ceramics

Li, Lingxia; Lu, Te; Zhang, Ning; Li, Jiangteng; Cai, Zhaoyang

doi:10.1039/c7tc05277d

Cited by 99 publications

(42 citation statements)

References 49 publications

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“…)in grain is responsible for the abnormal high and DC voltage independent dielectric response in high frequency range (around 10 6 Hz). This is consistent with the literature Sb+Ga, Nb+Lu and Nb+La system [18,26,32]. Fig.…”

Section: Resultssupporting

confidence: 93%

“…The Egb value increased with increasing co-dopant concentration, which indicates that other factor such as space charge might affect the observed dielectric behavior [26]. Similar phenomenon has been observed in the Sb+Ga and Nb + La co-doped TiO2 ceramics [18,26].…”

Section: Resultssupporting

confidence: 72%

“…It is suggested that large defect dipole clusters containing highly localized electrons are responsible for its CP properties. Subsequently, a lot of doping modification of TiO2 based ceramics is carried out and the mechanism of its colossal dielectric effect is discussed [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. In addition to EPDD, other mechanisms have been proposed, including the IBLC effect, electrode effect [14,26], electron hopping [27], surface barrier effect [28], and micro-inhomogeneity and polarization relaxation [29].…”

Section: Introductionmentioning

confidence: 99%

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Colossal Permittivity and Multiple Effects in (Zn + Ta) co-doped TiO2 Ceramics

Fan

Yang²,

Cao³

2020

Preprint

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Abstract The search for giant dielectric constant materials is imperative because of their potential for important applications for the areas of device miniaturization and energy storage. In this work, we report a (Zn + Ta) co-doped TiO2 (ZTTO) ceramics that manifests high dielectric permittivity (>104) and low dielectric loss. This dielectric property shows a high stability in wide temperature range (25-200℃) and frequency range(20-106Hz). The crystalline structure, microstructure and dielectric properties of ZTTO ceramics were systematically investigated. XPS, Impedance spectroscopy and frequency dependent dielectric constant under DC bias results reveal that the colossal dielectric properties of (Zn2+1/3Ta5+2/3)xTi1-xO2 ceramics were mainly caused by electron-pinned defect-dipoles (EPDD) model, internal barrier layer capacitance (IBLC) effect and electrode effect. This work would provide a guidance to further researching the colossal permittivity CP materials.

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Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

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Colossal Permittivity and Multiple Effects in (Zn + Ta) co-doped TiO2 Ceramics

Fan

Yang²,

Cao³

2020

Preprint

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“…This finding has triggered a burst of research activities on (A + B) co‐doped TiO 2 ceramics. So far, the dual doping in TiO 2 can be clarified into two types: (i) tri‐ and pentavalent ions co‐doping, such as (In 3+ +Nb 5+ /Ta 5+ ), (Sm 3+ +Ta 5+ ), (V 3+ +Nb 5+ ), (Sc 3+ +Nb 5+ ), (Ga 3+ +Nb 5+ /Ta 5+ /Sb 5+ ), (Yb 3+ +Nb 5+ ), (Bi 3+ +Nb 5+ ), (Dy 3+ +Nb 5+ ), (Al 3+ +Nb 5+ /Ta 5+ /Sb 5+ ), (Er 3+ +Nb 5+ ), (Y 3+ +Nb 5+ ), (Tl 3+ +Nb 5+ ), (Eu 3+ +Nb 5+ ), (Pr 3+ +Nb 5+ ), and (La 3+ +Nb 5+ ), (ii) bi‐ and pentavalent ions co‐doping, such as (Ca 2+ +Nb 5+ ), (Mg 2+ +Nb 5+ /Ta 5+ ), and (Zn 2+ +Nb 5+ ) …”

Section: Introductionmentioning

confidence: 99%

Microstructure, colossal permittivity, and humidity sensitivity of (Na, Nb) co‐doped rutile TiO₂ ceramics

Wang

et al. 2019

J Am Ceram Soc

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(Na0.25Nb0.75)xTi1−xO2 (NNTO) ceramics (x = 0, 0.005, 0.01, 0.02, and 0.05) were prepared by the conventional solid‐state reaction. The microstructure, dielectric, and humidity sensitivity of the ceramics were systematically investigated. Results showed that all ceramics exhibit pure rutile TiO2 phase with dense microstructures. Co‐doping of (Na, Nb) can effectively improve the microstructure homogeneity of the ceramics. When the doping level x ≥ 0.01, the co‐doped samples show colossal permittivity higher than 104 and dielectric loss tangent lower than 0.38. This dielectric behavior features the merit of both frequency and temperature stability in the range of 102‐106 Hz and 100‐300 K, respectively. The co‐doped ceramics were found to be sensitive to the environment moisture. The humidity sensitivity incurs a Maxwell‐Wagner relaxation near room temperature, which further enhances the dielectric permittivity. Excellent humidity sensitive properties of sensitivity to be 102.6 pF/%RH, response/recovery time to be 115/20 seconds, as well as good repeatability, were achieved in the sample with the doping level x = 0.05. This work underscores that the room temperature dielectric properties of doubly doped TiO2 system depends strongly on the environmental condition and suggests that the (Na + Nb) co‐doped TiO2 ceramics might be promising humidity sensing materials.

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“…8,[11][12][13][14] These mechanisms coexist and are consistent with the defect-cluster model in co-doped TiO 2 . [15][16][17] In general, electrons in rutile (A 0.5 3+ B 0.5 5+ ) where C = A 3+ , Ti 3+ , or Ti 4+ ) in the TiO 2 lattice that correlated/ overlapped with each other. While the electrons are highly localized in large defect-dipole clusters, very low tanδ is obtained in co-doped TiO 2 and the CP properties are related to the presence of EPDD polarization.…”

Section: Introductionmentioning

confidence: 99%

Influence of Zr dopant on polarization in rutile (In_0.5Nb_0.5)_0.005(Ti_1‐_xZr_x)_0.995O₂ ceramics

et al. 2019

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(In0.5Nb0.5)0.005(Ti1‐xZrx)0.995O2 (INZT, x = 0‐0.10) ceramics were synthesized using a conventional sintering method, and the effects of Zr content on the microstructures, dielectric properties and electron‐pinned defect‐dipoles (EPDD) polarization of the resultant products were investigated. The solubility limit of INZT was x = 0.075, and a secondary ZrTiO4 phase appeared at x = 0.10. Ceramics with x = 0‐0.10 exhibited excellent dielectric properties, ie, colossal permittivity (CP, εʹ > 103) and low dielectric loss (tanδ < 0.1), over a wide range of frequencies (100‐106 Hz at 300 K) and temperatures (50‐350 K at 1 kHz). The dielectric spectra and XPS results confirmed that the CP property of the ceramics could be ascribed to their EPDD polarization. The activation energy (Ea) for EPDD polarization was continuously enhanced by increasing x values. EPDD relaxation parameters at different x values were revealed using Cole‐Cole equation fitting. Moreover, α, which characterize the relaxation time τ distribution, increased with x values, thus indicating that Zr was involved in and affected electron localized states. The high Ea, temperature Tp of the peak εʹʹ at 1 kHz, and dielectric relaxation time τp at 30 K were related to increases in hopping distance of electrons among defect clusters with Zr addition.

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The effect of segregation structure on the colossal permittivity properties of (La_0.5Nb_0.5)_xTi_1−xO₂ ceramics

Abstract: The activation energies of the grain-boundary and different polarizations are researched to reveal the effect of the segregation structure on the performance.

Cited by 99 publications

References 49 publications

Colossal Permittivity and Multiple Effects in (Zn + Ta) co-doped TiO2 Ceramics

Colossal Permittivity and Multiple Effects in (Zn + Ta) co-doped TiO2 Ceramics

Microstructure, colossal permittivity, and humidity sensitivity of (Na, Nb) co‐doped rutile TiO₂ ceramics

Influence of Zr dopant on polarization in rutile (In_0.5Nb_0.5)_0.005(Ti_1‐_xZr_x)_0.995O₂ ceramics

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The effect of segregation structure on the colossal permittivity properties of (La0.5Nb0.5)xTi1−xO2 ceramics

Abstract: The activation energies of the grain-boundary and different polarizations are researched to reveal the effect of the segregation structure on the performance.

Cited by 99 publications

References 49 publications

Colossal Permittivity and Multiple Effects in (Zn + Ta) co-doped TiO2 Ceramics

Colossal Permittivity and Multiple Effects in (Zn + Ta) co-doped TiO2 Ceramics

Microstructure, colossal permittivity, and humidity sensitivity of (Na, Nb) co‐doped rutile TiO2 ceramics

Influence of Zr dopant on polarization in rutile (In0.5Nb0.5)0.005(Ti1‐xZrx)0.995O2 ceramics

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The effect of segregation structure on the colossal permittivity properties of (La_0.5Nb_0.5)_xTi_1−xO₂ ceramics

Microstructure, colossal permittivity, and humidity sensitivity of (Na, Nb) co‐doped rutile TiO₂ ceramics

Influence of Zr dopant on polarization in rutile (In_0.5Nb_0.5)_0.005(Ti_1‐_xZr_x)_0.995O₂ ceramics