High dielectric performance of (Nb5+, Lu3+) co-doped TiO2 ceramics in a broad temperature range

Hu, Baofu; Sun, Kening; Wang, Jian; Xu, Jian; Liu, Bingguo; Zhang, Jingjing; Yang, Yang

doi:10.1016/j.matlet.2020.127838

Cited by 21 publications

(21 citation statements)

References 21 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%

“…This may result in an slight increase in DC conductivity and loss around 10 5 Hz [26,32]. Therefore, the IBLC effect and electrode response is mainly responsible for the high permittivity in Zn + Ta co-doped TiO2 ceramics in middle frequency range.…”

Section: Resultsmentioning

confidence: 99%

“…In the EPDD model, the permittivity remains nearly unchanged under DC biases [33]. The outstanding high permittivity (>10 4 ) in the high frequency range can not be understood by the interfacial polarization occurring in the low and middle frequency range [26,32]. It is suggested that the defect or defect clusters…”

Section: Resultsmentioning

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: Resultsmentioning

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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“…In addition, the ionic radius of Ti 4+ , Zn 2+ , and Ta 5+ are around 0.605 Å, 0.74 Å, and 0.64 Å, respectively. The small mismatch of ionic radius between Ta 5+ , Zn 2+ , and Ti 4+ indicates impurity phase is hard to formed, which is different from rare earth codoped TiO 2 ceramics [16,17,20,30]. The Figure 1(b) clearly shows that the (110) diffraction peak slightly shifts toward a lower angle, which indicates that Ta and Zn on the Ti site leads to a larger cell volume due to lattice expansion.…”

Section: Resultsmentioning

confidence: 95%

“…Usually, the electrostatic potential barriers, i.e., double Schottky barriers, can be created at interfaces between n-type grains caused by trapping at acceptor states, leading to the bending of the conduction band across the grain boundary [26]. Under a DC bias, the barrier becomes asymmetric result in an slight increase in DC conductivity and loss around 10 5 Hz [26,30]. Combining with results in dielectric constant is seriously dependent on different electrodes (Au and Ag), as showed Figure 8(b).…”

Section: Resultsmentioning

confidence: 99%

Colossal permittivity and multiple effects in (Zn + Ta) codoped TiO₂ceramics

Fan

Yang

Cao

2020

Journal of Asian Ceramic Societies

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Colossal permittivity (CP) materials are potential for the important applications of device miniaturization and energy storage. In this work, (Zn 2+ 1/3 Ta 5+ 2/3) x Ti 1-x O 2 ceramics were fabricated by conventional solid-state method. Large dielectric permittivity (>10 4) and low tanδ (<0.06) have been attained. This dielectric property shows a high stability in wide temperature (30-200°C) and frequency (20-10 6 Hz) range. The crystalline structure, microstructure and dielectric properties of ZTTO ceramics were systematically investigated. XPS reveals the formation of electron-pinned defect-dipoles (EPDD) model. In addition, combined with impedance spectroscopy and frequency dependent dielectric constant under DC bias results reveal that colossal permittivity are mainly caused by EPDD model, internal barrier layer capacitance (IBLC) effect, and electrode effect. This work would provide guidance to further researching the colossal permittivity materials.

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Mitigation of chloride driven stress corrosion cracking susceptibility of 316L austenitic stainless steel using plasma sprayed TiO₂ coating

Kumar

Bhadauria

Singh

2021

Materialwissenschaft Werkst

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The present study proposes a protective TiO2 coating against chloride driven stress corrosion cracking problem of 316L austenitic stainless steel. To test the performance of the proposed coating, the severe chloride‐based boiling magnesium chloride solution at 155 °C was chosen. For experimentation, the constant strain‐based U‐bend specimens were coated with TiO2 using atmospheric plasma spray method. The results indicated higher resistance by TiO2 coated specimens against stress corrosion cracking problem, while the bare specimens experienced severe damage in the boiling magnesium chloride solution under various strain loading configurations. The coating‐electrolyte system of TiO2 coated sample demonstrated over seven times higher resistance, eventually led to reduction in corrosion rate over fifteen times compared to the bare 316L stainless steel in the boiling magnesium chloride solution. This improved performance of the coated 316L stainless steel is attributed to inhibition of outward diffusion of iron‐chromium‐nickel in the corrosive environment and the high chemical stability of TiO2.

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High dielectric performance of (Nb5+, Lu3+) co-doped TiO2 ceramics in a broad temperature range

Cited by 21 publications

References 21 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

Colossal permittivity and multiple effects in (Zn + Ta) codoped TiO₂ceramics

Mitigation of chloride driven stress corrosion cracking susceptibility of 316L austenitic stainless steel using plasma sprayed TiO₂ coating

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High dielectric performance of (Nb5+, Lu3+) co-doped TiO2 ceramics in a broad temperature range

Cited by 21 publications

References 21 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

Colossal permittivity and multiple effects in (Zn + Ta) codoped TiO2ceramics

Mitigation of chloride driven stress corrosion cracking susceptibility of 316L austenitic stainless steel using plasma sprayed TiO2 coating

Contact Info

Product

Resources

About

Colossal permittivity and multiple effects in (Zn + Ta) codoped TiO₂ceramics

Mitigation of chloride driven stress corrosion cracking susceptibility of 316L austenitic stainless steel using plasma sprayed TiO₂ coating