Colossal permittivity in ceramics of TiO<sub>2</sub>Co-doped with niobium and trivalent cation

Cheng, Xiaojing; Li, Zhenwei; Wu, Jiagang

doi:10.1039/c5ta00141b

Cited by 220 publications

(121 citation statements)

References 39 publications

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“…Previous researches proposed AB co-doped rutile TiO 2 ceramics (A was introduced as an electron-acceptor, such as In 3+ ; B was introduced as an electron-donor, such as Nb 5+ ) as a new sequence of CP materials 1, 2, 4, 13, 14 . The existence of a giant dielectric constant (ε r ~ 6 × 10 4 ) along with a low dielectric loss (tan δ < 0.02) at room temperature over varied frequency from 10 2 to 10 6 Hz was found in their research 1 .…”

Section: Introductionmentioning

confidence: 99%

“…There are other mechanisms used to explain the overall dielectric response in TiO 2 -based ceramics, including electron hopping 18 and non-Ohmic sample-electrode contact 3 . In addition, following researches introduced more similar types of ceramics such as Ga+Nb and Al+Nb co-doped TiO 2 2–4, 14 . However, both of the Ga+Nb and Al+Nb co-doped rutile TiO 2 ceramics were also reported to show poor dielectric properties compared with the In+Nb co-doped in TiO 2 ceramics 1, 3, 4, 13, 16, 17, 19–21 .…”

Section: Introductionmentioning

confidence: 99%

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Dielectric properties of Y and Nb co-doped TiO2 ceramics

Wang

Zhang

et al. 2017

Sci Rep

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In this work, the (Y0.5Nb0.5)xTi1−xO2 (x = 0.001, 0.01, 0.02, 0.04, 0.06 and 0.1) ceramics (as called YNTO) were fabricated by synthesized through a standard solid-state reaction. As revealed by the X-ray diffraction (XRD) spectra, the YNTOs exhibit tetragonal rutile structure. Meanwhile, the grain size of YNTO ceramics increased and then decreased with the increase of x value, and the largest value reached when x = 0.02. All the YNTO samples display colossal permittivity (~102–105) over a wide temperature and frequency range. Moreover, the optimal ceramic, (Y0.5Nb0.5)0.02Ti0.98O2, exhibits high performance over a broad temperature range from 20 °C to 180 °C; specifically, at 1 kHz, the dielectric constant and dielectric loss are 6.55 × 104 and 0.22 at room temperature, and they are 1.03 × 105 and 0.11 at 180 °C, respectively.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dielectric properties of Y and Nb co-doped TiO2 ceramics

Wang

Zhang

et al. 2017

Sci Rep

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“…9,10 In the new colossal permittivity materials, simultaneous donor and acceptor substitutions into TiO 2 are considered to create the local combination of a partially delocalized electron, as a result of the formation of a defectdipole complex/cluster. [13][14][15] Therefore, it should be feasible that co-doping of monovalent or bivalent elements with Nb into TiO 2 may also lead to colossal permittivity effects on the conditions under which the charge balance is kept. Although the grain boundary capacitance effect is considered to contribute to the colossal dielectric properties, 11,12 the newly discovered co-doped TiO 2 materials would provide more choices to tune and optimize dielectric properties through the combination of substituted ions.…”

Section: Introductionmentioning

confidence: 99%

Colossal permittivity properties of Zn,Nb co-doped TiO₂with different phase structures

et al. 2015

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Colossal permittivity properties were studied in Zn,Nb co-doped TiO 2 with different phase structures. The (Zn 1/3 Nb 2/3 ) 0.05 Ti 0.95 O 2 rutile ceramics were prepared by the solid state sintering technique, while the amorphous and anatase films were respectively fabricated by a pulsed laser deposition method and a subsequent rapid thermal annealing. The ceramics showed a frequency (10 2 -10 6 Hz) independent dielectric response with a colossal dielectric permittivity (B30 000), and a relatively low dielectric loss (B0.05) at room temperature. The excellent colossal permittivity properties are comparable to those of the previously reported rutile TiO 2 ceramics by co-doping trivalent and pentavalent elements.For amorphous films, the dielectric permittivity decreased, and the dielectric loss increased slightly compared to those of the ceramics. Compared with the amorphous thin films, the annealed anatase ones exhibited a simultaneous increase in both dielectric permittivity and loss at low frequency while kept almost unchanged at high frequency. These results suggest that co-doping of bivalent elements with Nb into TiO 2 with various phase structures can yield colossal permittivity effects, including ultrahigh dielectric permittivity, relatively low dielectric loss. Furthermore, the colossal permittivity properties may be mainly attributed to the effect of the electron-pinned defect-dipoles in Zn,Nb co-doped TiO 2 with different phase structures rather than the grain boundary capacitance effect. Besides, the frequency and bias dependent dielectric properties were also investigated in thin film forms, which could be affected by the electrode-film interface and mobile ions. Our results are helpful for not only investigating the new class of colossal permittivity materials, but also developing dielectric thin film device applications.

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“…Since the discovery of TINO, a series of co-doped rutiles, such as (Sm + Ta), 8 (Zn + Nb) 9 , (Al + Nb) 10 , (Bi + Nb) 11 , (In + Ta) 12 and (Ga + Nb) 13 doped TiO 2 , have been investigated and found to have CP behavior. Liu et al .…”

Section: Introductionmentioning

confidence: 99%

Origin of colossal dielectric response in (In + Nb) co-doped TiO2 rutile ceramics: a potential electrothermal material

et al. 2017

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(In + Nb) co-doped TiO2 (TINO) rutile is an emerging material with a colossal dielectric permittivity (CP) and a low dielectric loss over wide temperature and frequency ranges. The electrical inhomogeneous nature of TINO ceramics is demonstrated by direct local current probing with high-resolution conductive atomic force microscopy (cAFM). The CP response in TINO is found to originate from the electron-pinned defect dipole induced conductive cluster effect and the electrode effect. Two types of dielectric relaxations are simultaneously observed due to these two effects. With the given synthesis condition, we found TINO shows a highly leaky feature that impairs its application as a dielectric material. However, the fast-temperature-rising phenomenon found in this work may open a new door for TINO to be applied as a potential electrothermal material with high efficiency, oxidation-proof, high temperature stability, and energy saving.

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Colossal permittivity in ceramics of TiO₂Co-doped with niobium and trivalent cation

Cited by 220 publications

References 39 publications

Dielectric properties of Y and Nb co-doped TiO2 ceramics

Dielectric properties of Y and Nb co-doped TiO2 ceramics

Colossal permittivity properties of Zn,Nb co-doped TiO₂with different phase structures

Origin of colossal dielectric response in (In + Nb) co-doped TiO2 rutile ceramics: a potential electrothermal material

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Colossal permittivity in ceramics of TiO2Co-doped with niobium and trivalent cation

Cited by 220 publications

References 39 publications

Dielectric properties of Y and Nb co-doped TiO2 ceramics

Dielectric properties of Y and Nb co-doped TiO2 ceramics

Colossal permittivity properties of Zn,Nb co-doped TiO2with different phase structures

Origin of colossal dielectric response in (In + Nb) co-doped TiO2 rutile ceramics: a potential electrothermal material

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Colossal permittivity in ceramics of TiO₂Co-doped with niobium and trivalent cation

Colossal permittivity properties of Zn,Nb co-doped TiO₂with different phase structures