Correlation between the radius of acceptor ion and the dielectric properties of co-doped TiO2 ceramics

Wang, Zhuo; Li, Yinbo; Chen, Haonan; Fan, Jie; Wang, Xiaoying; Ma, Xiaopeng

doi:10.1016/j.ceramint.2019.04.181

Cited by 33 publications

(12 citation statements)

References 43 publications

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“…Furthermore, they are also used in environmental oriented applications including wastewater treatment (Yuzer et al, 2015), air purification (Paz, 2010) and soil remediation (Yang and Xing, 2009). Rutile is used in optical elements and as a dielectric material in ceramics (Amtout and Leonelli, 1995;Wang et al, 2019). Anatase is applied as a catalytic support for the production of nanotubes and nanoribbons (Mogilevsky et al, 2008) and used in photovoltaics (Grätzel, 2001).…”

Section: Introductionmentioning

confidence: 99%

Biochemical and histopathological impacts of rutile and anatase (TiO2 forms) in Mytilus galloprovincialis

Leite

Coppola

Monteiro

et al. 2020

Science of The Total Environment

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Section: Introductionmentioning

confidence: 99%

Biochemical and histopathological impacts of rutile and anatase (TiO2 forms) in Mytilus galloprovincialis

Leite

Coppola

Monteiro

et al. 2020

Science of The Total Environment

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“…In general, The ε r is linked to the capacity of electrons to hop in a material. 13 Figure 5(a) reveals the temperature dependence of TiO 2 -based CP ceramics at 1 kHz. As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…11 Liu et al 12 studied the influence of diverse acceptor ion on structure and electrical properties by traditional sintering(TS) in co-doped TiO 2 CP ceramic. Wang et al 13 confirmed the relationship between the acceptor ion radius and dielectric properties using TS in TiO 2 -based ceramics. Wu et al [14][15][16] prepared a series of donor (Nb, Ta) and donor (Zn, Mg, Al, Sm, Dy, ect) co-doped TiO 2 colossal dielectric ceramics by TS.…”

mentioning

confidence: 89%

Flash Sintering Preparation and Characterizations of (M_0.5Ta_0.5)_0.05Ti_0.95O₂ (M = Al, Ga, In) Colossal Dielectric Ceramics

Wang¹,

Zheng²,

Zhang³

et al. 2023

ECS J. Solid State Sci. Technol.

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In this paper, (M0.5Ta0.5)0.05Ti0.95O2 (M = Al, Ga, In) ceramic materials were successfully prepared by Flash Sintering (FS) under an electric field of 550 V cm−1 at 1200 °C for 18 min. The influences of different ionic radius on flash sintering behavior, crystal structure, microstructure and dielectric properties of TiO2-based colossal permittivity (CP) ceramics were systematically investigated. FS can reduce the sintering temperature by 200 °C and shorten the sintering time by more than 12 times. The results show that all flash sintering samples were pure rutile TiO2 structure. The grain size decreased with increasing ionic radius. ATTO had the lowest dielectric loss of 0.2 and ITTO had a maximum dielectric constant of 8100 at 1 kHz. XPS analysis confirms that Ti3+ content increased gradually with increasing ion radius. Impedance spectroscopy analysis shows that all flash sintering ceramics were composed of semi-conductive grains and insulating grain boundaries. The CP behavior was explained using the internal barrier layer capacitance effect. This work provides a very meaningful method for the preparation of co-doped TiO2 CP ceramic materials.

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“…One of the most interesting co-dopants is Ln 3+ /Nb 5+ (or Ta 5+ ), where Ln = La, Dy, Pr, Nd, Eu, Er, Gd, and Sm [19][20][21][22][23][24][25][26][27][28][29][30]. Owing to the large ionic radii (r 6 ) exhibited by the Ln 3+ ions, when they are substituted into the rutile-TiO 2 structure, EPDDs may subsequently be induced [26,31].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution and High-Performance Giant Dielectric Properties of Lu3+/Nb5+ Co-Doped TiO2 Ceramics

et al. 2021

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Giant dielectric (GD) oxides exhibiting extremely large dielectric permittivities (ε’ > 104) have been extensively studied because of their potential for use in passive electronic devices. However, the unacceptable loss tangents (tanδ) and temperature instability with respect to ε’ continue to be a significant hindrance to their development. In this study, a novel GD oxide, exhibiting an extremely large ε’ value of approximately 7.55 × 104 and an extremely low tanδ value of approximately 0.007 at 103 Hz, has been reported. These remarkable properties were attributed to the synthesis of a Lu3+/Nb5+ co-doped TiO2 (LuNTO) ceramic containing an appropriate co-dopant concentration. Furthermore, the variation in the ε’ values between the temperatures of −60 °C and 210 °C did not exceed ±15% of the reference value obtained at 25 °C. The effects of the grains, grain boundaries, and second phase particles on the dielectric properties were evaluated to determine the dielectric properties exhibited by LuNTO ceramics. A highly dense microstructure was obtained in the as-sintered ceramics. The existence of a LuNbTiO6 microwave-dielectric phase was confirmed when the co-dopant concentration was increased to 1%, thereby affecting the dielectric behavior of the LuNTO ceramics. The excellent dielectric properties exhibited by the LuNTO ceramics were attributed to their inhomogeneous microstructure. The microstructure was composed of semiconducting grains, consisting of Ti3+ ions formed by Nb5+ dopant ions, alongside ultra-high-resistance grain boundaries. The effects of the semiconducting grains, insulating grain boundaries (GBs), and secondary microwave phase particles on the dielectric relaxations are explained based on their interfacial polarizations. The results suggest that a significant enhancement of the GB properties is the key toward improvement of the GD properties, while the presence of second phase particles may not always be effective.

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Correlation between the radius of acceptor ion and the dielectric properties of co-doped TiO2 ceramics

Cited by 33 publications

References 43 publications

Biochemical and histopathological impacts of rutile and anatase (TiO2 forms) in Mytilus galloprovincialis

Biochemical and histopathological impacts of rutile and anatase (TiO2 forms) in Mytilus galloprovincialis

Flash Sintering Preparation and Characterizations of (M_0.5Ta_0.5)_0.05Ti_0.95O₂ (M = Al, Ga, In) Colossal Dielectric Ceramics

Microstructural Evolution and High-Performance Giant Dielectric Properties of Lu3+/Nb5+ Co-Doped TiO2 Ceramics

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Correlation between the radius of acceptor ion and the dielectric properties of co-doped TiO2 ceramics

Cited by 33 publications

References 43 publications

Biochemical and histopathological impacts of rutile and anatase (TiO2 forms) in Mytilus galloprovincialis

Biochemical and histopathological impacts of rutile and anatase (TiO2 forms) in Mytilus galloprovincialis

Flash Sintering Preparation and Characterizations of (M0.5Ta0.5)0.05Ti0.95O2 (M = Al, Ga, In) Colossal Dielectric Ceramics

Microstructural Evolution and High-Performance Giant Dielectric Properties of Lu3+/Nb5+ Co-Doped TiO2 Ceramics

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Flash Sintering Preparation and Characterizations of (M_0.5Ta_0.5)_0.05Ti_0.95O₂ (M = Al, Ga, In) Colossal Dielectric Ceramics