The influence of titanium doping on the electric properties of amorphous alumina films prepared by sol–gel technology

Yao, Manwen; Xiao, Ruihua; Peng, Yong; Chen, Jianwen; Hu, Baofu; Yao, Xi

doi:10.1007/s10971-014-3568-1

Cited by 16 publications

(4 citation statements)

References 21 publications

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“…Huang et al [35] improved the DBS of the Al 2 O 3 -SiO 2 -TiO 2 ceramics by doping Ni 2 O 3 , and they attributed the improvement to inhibiting the oxygen vacancies because of the reaction 1/2Ni 2 O 3 → NiO + 1/2O 2 . Yao et al [36] improved the DBS of the Al 2 O 3 film by doping TiO 2 , and they attributed the improvement to the decrease in the oxygen vacancies due to the doping. Much more work on the effect of point defects on the DBS of alumina ceramics is needed.…”

Section: Analyses On the Underlying Mechanisms Behind The Effects Omentioning

confidence: 99%

Effects of annealing and firing in wet hydrogen on the dielectric breakdown strengths of alumina ceramics

Tang

Liu

et al. 2020

J Adv Ceram

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Annealing and firing in wet hydrogen are widely used steps in the processing alumina-ceramic insulators that may affect their dielectric breakdown strengths (DBS). In this study, the effects of annealing (at 1300 ℃ for 7 h) and firing in wet hydrogen on the DBS of alumina ceramics (all sintered at 1650 ℃) were studied, and the underlying mechanisms were analyzed by material characterizations. Annealing reduced the DBS of the 95% alumina ceramics due to the inter-granular phase crystallization, and the reduction in the DBS could be correlated to the reduction in mechanical strength. In contrast, annealing improved the DBS of the 99% alumina ceramic without intergranular phase transformation. Firing in wet hydrogen at 1500 ℃ caused the DBS increment, which can be ascribed to the reduction in the concentrations of point defects and electrical carriers.

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Section: Analyses On the Underlying Mechanisms Behind The Effects Omentioning

confidence: 99%

Effects of annealing and firing in wet hydrogen on the dielectric breakdown strengths of alumina ceramics

Tang

Liu

et al. 2020

J Adv Ceram

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“…Their dielectric properties were comprehensively discussed in these papers. Later on a need to still improve the obtained average breakdown strength of 1.2 MV/cm (Yao and Shan 2013) was stated (Yao et al 2015). For improving the dielectric strength, doping of the alumina layers with titanium was successful.…”

Section: Dielectric Filmsmentioning

confidence: 99%

“…For improving the dielectric strength, doping of the alumina layers with titanium was successful. Thus, the percentage of oxygen vacancies in the alumina could be reduced (Yao et al 2015).…”

Section: Dielectric Filmsmentioning

confidence: 99%

Alumina Thin Films

Nofz¹

2016

Handbook of Sol-Gel Science and Technology

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This chapter gives an overview over preparation, properties, and applications of alumina thin films. The preparation of polymeric and colloidal alumina sols and their deposition on diverse substrate materials with different geometries are described first. Consideration of properties (surface tension, particle size, viscosity, aging of the sols, and their optimization by using certain additives) is included, too. A description of posttreatments of the coatings, which initiate phase transformations and also determine their microstructure, completes the part on coating preparation. Data on adhesion, thickness, surface roughness, and mechanical, textural as well as optical properties of alumina thin films are provided in a further paragraph. In a third main part, experience concerning possible applications, such as (i) membranes for catalysis, separation, and filtration, (ii) barrier layers against electrochemical and high-temperature corrosion or interdiffusion of ions between different phases, (iii) mechanical protection, (iv) sensor construction, (v) improvement of optical properties, as well as (vi) achieving water repellency, is summarized.

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“…One of the distinct advantages of the sol-gel technology is: the chemical composition and phase composition of the material can be easily and precisely controlled. Recently, the substitution effect of doping elements (Ti 4+ , La 3+ ) on the leakage current and breakdown characteristic of amorphous alumina thin films has been studied and excellent dielectric properties of doped alumina thin films were achieved [9,10].…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties under high electric field for silicon doped alumina thin film with glass-like structure derived from sol-gel process

Yao

Zou

et al. 2017

Journal of Alloys and Compounds

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Dielectric Al 2-x Si x O y (X=0.00, 0.02, 0.05, 0.10) thin films were deposited onto Pt/Ti/SiO 2 /Si substrates using sol-gel spin coating technology. The obtained materials were characterized via differential scanning calorimetry (DSC), scanning electron microscopy (SEM), fourier transform infrared spectrometry (FT-IR) and X-ray photoelectron spectrometry (XPS). The results show that the films are amorphous with Si atoms occupying Al atom sites forming Al-O-Si bonds and glass-like structure. The dielectric properties of the film were investigated. By means of silicon doping, the leakage current and the dielectric loss of the amorphous alumina films much reduced while the breakdown strength enhanced. Two orders of magnitude reduction in leakage current and significant enhancement in breakdown strength (up to 566 MV/m) can be achieved. The improved dielectric properties are attributed to the forming of Al-O-Si bonds and cation vacancies by the Si-addition.The structure modification enhanced the stability of alumina structure and promoted the ionic transportation to repair the defects of the alumina films.

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The influence of titanium doping on the electric properties of amorphous alumina films prepared by sol–gel technology

Cited by 16 publications

References 21 publications

Effects of annealing and firing in wet hydrogen on the dielectric breakdown strengths of alumina ceramics

Effects of annealing and firing in wet hydrogen on the dielectric breakdown strengths of alumina ceramics

Alumina Thin Films

Dielectric properties under high electric field for silicon doped alumina thin film with glass-like structure derived from sol-gel process

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