Preparation and properties of La and Nb co-doped TiO2 colossal dielectric ceramic materials

Wang, X. W.; Zheng, Yun; Liang, Bing; Zhang, G.; Shi, Y. C.; Zhang, B. H.; Xue, Lulu; Shang, Shuying; Shang, Jun; Yin, Shengyong; Hu, Yidan

doi:10.1007/s10854-020-04169-x

Cited by 12 publications

(8 citation statements)

References 20 publications

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“…Additionally, the grain in the co-doped samples seems to be composed of smaller subgrains as shown by the red-dashed line in the SEM micrograph of the sample x = 0.025 (Figure 3). Similar observations on the effect of doping content on the grain size have been reported [25][26][27]. This behavior was attributed to the effect of the secondary phase in inhibiting grain growth [25] and/or the increased number of nuclei centers with increasing doping content [27].…”

Section: Resultssupporting

confidence: 81%

Colossal Permittivity Characteristics of (Nb, Si) Co-Doped TiO2 Ceramics

et al. 2022

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(Nb5+, Si4+) co-doped TiO2 (NSTO) ceramics with the compositions (Nb0.5Si0.5)xTi1−xO2, x = 0, 0.025, 0.050 and 0.1 were prepared with a solid-state reaction technique. X-ray diffraction (XRD) patterns and Raman spectra confirmed that the tetragonal rutile is the main phase in all the ceramics. Additionally, XRD revealed the presence of a secondary phase of SiO2 in the co-doped ceramics. Impedance spectroscopy analysis showed two contributions, which correspond to the responses of grain and grain-boundary. All the (Nb, Si) co-doped TiO2 showed improved dielectric performance in the high frequency range (>103 Hz). The sample (Nb0.5Si0.5)0.025Ti0.975O2 showed the best dielectric performance in terms of higher relative permittivity (5.5 × 104) and lower dielectric loss (0.18), at 10 kHz and 300 K, compared to pure TiO2 (1.1 × 103, 0.34). The colossal permittivity of NSTO ceramics is attributed to an internal barrier layer capacitance (IBLC) effect, formed by insulating grain-boundaries and semiconductor grains in the ceramics.

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Section: Resultssupporting

confidence: 81%

Colossal Permittivity Characteristics of (Nb, Si) Co-Doped TiO2 Ceramics

et al. 2022

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“…It can be concluded that the dielectric response of LTTO ceramics is contributed by grain response, grain boundary response and electrode response. Similar phenomena can also be observed in the Nb+Al, Nb +La, Nb+In, Nb+Li and Sb+Ga systems [2,26,[42][43][44]. As the temperature increases, the peak shifts to higher frequencies, the activation energy were simulated by formulas (3):…”

Section: Resultssupporting

confidence: 55%

“…In order to effectively study the dielectric relaxation mechanism and conductive behavior of co-doped TiO 2 ceramics, a combination of complex electric modulus and complex impedance spectroscopy is usually used [42,43]. The frequency-dependent permittivity of LTTO ceramics (x = 0.01) is shown in Figure 5(a,b).…”

Section: Resultsmentioning

confidence: 99%

High dielectric performance and multifarious polarizations in (Lu + Ta) co-doped TiO₂ceramics

Fan

Zhang

2021

Journal of Asian Ceramic Societies

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Materials with high dielectric constant have broad application prospects in energy storage elements. In this work, (Lu 0.5 Ta 0.5 ) x Ti 1-x O 2 ceramics (x = 0, 0.01, 0.02 and 0.04) were synthesized by a standard conventional solid-state reaction. Remarkably, (Lu 0.5 Ta 0.5 ) 0.01 Ti 0.99 O 2 ceramic exhibits a high dielectric permittivity (2.55 × 10 4 ), low dielectric loss (0.012) and excellent stabilities of frequency and temperature (−150-150°C and 20-5 × 10 6 Hz). The formation mechanism of excellent dielectric properties was studied based on analysis of the XRD, SEM, XPS, complex impedance and electric modulus. Colossal permittivity (CP) and low tan δ were attributed to the internal barrier layer capacitance (IBLC) effect, electron-pinned defect-dipole (EPDD) effect and electrode effect. This work has important guidance for the further research of giant dielectric materials.

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“…Intensive studies on CP materials during the last two decades have given rise to several material families with CP properties. The titanate families such as CaCu 3 Ti 4 O 12 (CCTO) [ 2 , 3 , 4 ], doped TiO 2 , and their derived ceramics [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ] are still attracting the attention of researchers. Generally, the structural, electrical, and dielectric properties of CP materials are found to be sensitive to the powder synthesis, calcination, and sintering methods and conditions.…”

Section: Introductionmentioning

confidence: 99%

Dielectric Properties of Colossal-Dielectric-Constant Na1/2La1/2Cu3Ti4O12 Ceramics Prepared by Spark Plasma Sintering

et al. 2022

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In the current study, we report on the dielectric behavior of colossal-dielectric-constant Na1/2La1/2Cu3Ti4O12 (NLCTO) ceramics prepared by mechanochemical synthesis and spark plasma sintering (SPS) at 850 °C, 900 °C, and 925 °C for 10 min. X-ray powder diffraction analysis showed that all the ceramics have a cubic phase. Scanning electron microscope observations revealed an increase in the average grain size from 175 to 300 nm with an increase in the sintering temperature. SPS NLCTO ceramics showed a room-temperature colossal dielectric constant (>103) and a comparatively high dielectric loss (>0.1) over most of the studied frequency range (1 Hz–40 MHz). Two relaxation peaks were observed in the spectra of the electrical modulus and attributed to the response of grain and grain boundary. According to the Nyquist plots of complex impedance, the SPS NLCTO ceramics have semiconductor grains surrounded by electrically resistive grain boundaries. The colossal dielectric constant of SPS NLCTO ceramics was attributed to the internal barrier layer capacitance (IBLC) effect. The high dielectric loss is thought to be due to the low resistivity of the grain boundary of SPS NLCTO.

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Preparation and properties of La and Nb co-doped TiO2 colossal dielectric ceramic materials

Cited by 12 publications

References 20 publications

Colossal Permittivity Characteristics of (Nb, Si) Co-Doped TiO2 Ceramics

Colossal Permittivity Characteristics of (Nb, Si) Co-Doped TiO2 Ceramics

High dielectric performance and multifarious polarizations in (Lu + Ta) co-doped TiO₂ceramics

Dielectric Properties of Colossal-Dielectric-Constant Na1/2La1/2Cu3Ti4O12 Ceramics Prepared by Spark Plasma Sintering

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Preparation and properties of La and Nb co-doped TiO2 colossal dielectric ceramic materials

Cited by 12 publications

References 20 publications

Colossal Permittivity Characteristics of (Nb, Si) Co-Doped TiO2 Ceramics

Colossal Permittivity Characteristics of (Nb, Si) Co-Doped TiO2 Ceramics

High dielectric performance and multifarious polarizations in (Lu + Ta) co-doped TiO2ceramics

Dielectric Properties of Colossal-Dielectric-Constant Na1/2La1/2Cu3Ti4O12 Ceramics Prepared by Spark Plasma Sintering

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High dielectric performance and multifarious polarizations in (Lu + Ta) co-doped TiO₂ceramics