Colossal permittivity characteristics and mechanism of (Sr, Ta) co-doped TiO2 ceramics

Liu, Juan; Xu, Jinghong; Cui, Bing; Yu, Qin; Zhong, Shengwen; Zhang, Lei; Du, Shigui; Xu, Dong

doi:10.1007/s10854-020-03080-9

Cited by 24 publications

(12 citation statements)

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“…With increasing frequency, the « 0 of the conventional sintered and two-step flash sintered samples decreases gradually in the whole test temperature range, which may be caused by the attenuation of polarization, which corresponds to the previous study (Liu et al, 2020a(Liu et al, , 2020b. The « 0 of ceramic samples prepared by conventional sintered and two-step flash sintering increases with increasing temperature, which may be caused by space charge polarization (Liu et al, 2020a(Liu et al, , 2020bWang et al, 2022aWang et al, , 2022b. However, for the ceramic samples prepared by two-step flash sintering at 700 V/cm, the dielectric loss increases sharply when the temperature is higher than 250°C, which may be caused by more defective structures in the two-step flash sintering samples (Wang et al, 2019a(Wang et al, , 2019b(Wang et al, , 2019c.…”

Section: Resultssupporting

confidence: 87%

“…In Figure 8, the all ceramic samples have good temperature stability in the temperature range of 20°C–250°C. With increasing frequency, the ε′ of the conventional sintered and two-step flash sintered samples decreases gradually in the whole test temperature range, which may be caused by the attenuation of polarization, which corresponds to the previous study (Liu et al , 2020a, 2020b). The ε′ of ceramic samples prepared by conventional sintered and two-step flash sintering increases with increasing temperature, which may be caused by space charge polarization (Liu et al , 2020a, 2020b; Wang et al , 2022a, 2022b).…”

Section: Resultssupporting

confidence: 87%

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Two-step flash sintering of (Mg_1/3Ta_2/3)_0.01Ti_0.99O₂ giant dielectric ceramics

Wang

Peng

Zhong³

et al. 2022

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Purpose The purpose of this paper on the one hand is to reduce the sintering temperature, shorten the sintering time and improve the electrical properties of the sample through the two-step flash sintering method and on the other hand is to study the effect of electric field on the phase structure, microstructure and electrical properties of the flash sintering sample. Design/methodology/approach In this paper, (Mg1/3Ta2/3)0.01Ti0.99O2 giant dielectric ceramics were prepared by conventional sintering and two-step flash sintering, respectively. Further, the effect of electric field (600–750 V/cm) on the electrical properties of (Mg1/3Ta2/3)0.01Ti0.99O2 giant dielectric ceramics was studied. Findings The results show that compared with the conventional sintering, the sintering temperature of the two-step flash sintering can be reduced by 200°C and the sintering time can be shortened by 12 times. All sintered samples were single rutile TiO2 structure. Compared with conventional sintering, two-step flash sintering samples have finer grain size. The two-step flash sintered sample has similar dielectric properties to the conventional sintered sample. The dielectric constant of flash sintered samples decreases with the increase of electric field. When the electric field is 700 V/cm, the ceramic sample has the optimal dielectric properties, where the dielectric constant is approximately 5.5 × 103 and the dielectric loss is about 0.18 at 1 kHz. Impedance spectroscopy analysis shows that the excellent dielectric properties are attributed to the internal barrier layer capacitance model. Originality/value This paper not only provides a new method for the preparation of co-doped TiO2 giant dielectric ceramics but also has great potential in greatly improving efficiency and saving energy.

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Section: Resultssupporting

confidence: 87%

Section: Resultssupporting

confidence: 87%

Two-step flash sintering of (Mg_1/3Ta_2/3)_0.01Ti_0.99O₂ giant dielectric ceramics

Wang

Peng

Zhong³

et al. 2022

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“…The ε value of the Ta 5+ (or Nb 5+ ) single doped TiO 2 ceramic be extremely increased to 10 4 -10 5 in the radio frequency range, while the tanδ value can also be significantly increased [14,16,40]. The simultaneously increased ε and tanδ values can be explained by electron hopping [14][15][16]24,41]. The substitution of rutile TiO 2 with Ta 5+ can produce free electrons, according to the following Equations:…”

Section: Molecules 2021 26 X For Peer Review 4 Omentioning

confidence: 99%

Origins of Giant Dielectric Properties with Low Loss Tangent in Rutile (Mg1/3Ta2/3)0.01Ti0.99O2 Ceramic

et al. 2021

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The Mg2+/Ta5+ codoped rutile TiO2 ceramic with a nominal composition (Mg1/3Ta2/3)0.01Ti0.99O2 was synthesized using a conventional solid-state reaction method and sintered at 1400 °C for 2 h. The pure phase of the rutile TiO2 structure with a highly dense microstructure was obtained. A high dielectric permittivity (2.9 × 104 at 103 Hz) with a low loss tangent (<0.025) was achieved in the as-sintered ceramic. After removing the outer surface, the dielectric permittivity of the polished ceramic increased from 2.9 × 104 to 6.0 × 104, while the loss tangent also increased (~0.11). The dielectric permittivity and loss tangent could be recovered to the initial value of the as-sintered ceramic by annealing the polished ceramic in air. Notably, in the temperature range of −60–200 °C, the dielectric permittivity (103 Hz) of the annealed ceramic was slightly dependent (<±4.4%), while the loss tangent was very low (0.015–0.036). The giant dielectric properties were likely contributed by the insulating grain boundaries and insulative surface layer effects.

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“…Subsequently, a series of acceptor/donor co-doped TiO 2 materials were widely investigated, involving trivalent acceptors and other acceptors. For instance, acceptor dopants (A + , B 2+ , C 3+ ), isovalent dopant (I 4+ ), and donor dopants (D 5+ ) (A = Ag or Li, 10,11 B = Mg, Zn, Sr, Cu or Ca, 12–15 C = Al, Sm, Bi, Fe, In, Dy, Ga, Gd, Yb, or Sc, 16–20 I = Zr, 21 and D = Nb 5+ , Sb 5+ , and Ta 5+ (ref. 1 and 22–26)).…”

Section: Introductionmentioning

confidence: 99%

DFT calculations and giant dielectric responses in (Ni_1/3Nb_2/3)_xTi_1−xO₂

Thongyong,

Thongbai,

Srepusharawoot

2023

RSC Adv.

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Colossal permittivity characteristics and mechanism of (Sr, Ta) co-doped TiO2 ceramics

Cited by 24 publications

References 43 publications

Two-step flash sintering of (Mg_1/3Ta_2/3)_0.01Ti_0.99O₂ giant dielectric ceramics

Two-step flash sintering of (Mg_1/3Ta_2/3)_0.01Ti_0.99O₂ giant dielectric ceramics

Origins of Giant Dielectric Properties with Low Loss Tangent in Rutile (Mg1/3Ta2/3)0.01Ti0.99O2 Ceramic

DFT calculations and giant dielectric responses in (Ni_1/3Nb_2/3)_xTi_1−xO₂

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Colossal permittivity characteristics and mechanism of (Sr, Ta) co-doped TiO2 ceramics

Cited by 24 publications

References 43 publications

Two-step flash sintering of (Mg1/3Ta2/3)0.01Ti0.99O2 giant dielectric ceramics

Two-step flash sintering of (Mg1/3Ta2/3)0.01Ti0.99O2 giant dielectric ceramics

Origins of Giant Dielectric Properties with Low Loss Tangent in Rutile (Mg1/3Ta2/3)0.01Ti0.99O2 Ceramic

DFT calculations and giant dielectric responses in (Ni1/3Nb2/3)xTi1−xO2

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Product

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Two-step flash sintering of (Mg_1/3Ta_2/3)_0.01Ti_0.99O₂ giant dielectric ceramics

Two-step flash sintering of (Mg_1/3Ta_2/3)_0.01Ti_0.99O₂ giant dielectric ceramics

DFT calculations and giant dielectric responses in (Ni_1/3Nb_2/3)_xTi_1−xO₂