Significantly enhanced dielectric constant and breakdown strength in crystalline@amorphous core-shell structured SrTiO3 nanocomposite thick films

Xiao, Shengqiang; Yao, Manwen; Gao, Wenbin; Su, Zhen; Yao, Xi

doi:10.1016/j.jallcom.2018.05.221

Cited by 15 publications

(4 citation statements)

References 30 publications

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“…Higher rainfall intensities will dilute the nutrient in the mixing layer more quickly than lower rainfall intensities, which will reach a balance between the mixing layer and runoff faster, resulting in a more rapid time to reach a steady state in nutrient concentration. The decreasing trend of initial nutrient concentration with increasing rainfall intensities was in agreement with the results of Xiao, et al [37]. This might be caused by the fact that although higher rainfall intensity would certainly increase the possibility for nutrient transport to runoff, the dilution effects of runoff to nutrients would be another dominant factor during nutrient loss processes under a relatively small soil solution situation.…”

Section: Parameter Estimationsupporting

confidence: 90%

“…For example, the soil bulk density ( s ), the initial water content (θ i ) and the saturated soil water content (θ s ) are all listed in Table 1. The adsorption isotherm of ammonium nitrogen for the experimental soil was obtained based on the isothermal linear adsorption method [37], namely 1.74 cm 3 /g. The molecular diffusion coefficient in free water (D w ) for ammonium nitrogen is assigned to be 0.063 cm 2 /h [38].…”

Section: Parameter Estimationmentioning

confidence: 99%

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Mathematical Model of Ammonium Nitrogen Transport to Runoff with Different Slope Gradients under Simulated Rainfall

Xing

Yang

et al. 2019

Water

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The removal of nutrients by overland flow remains a major source of non-point pollution in agricultural land. In this study, a mathematical model of ammonium nitrogen transport from soil solution to overland flow was established. The model treated the mass transfer coefficient (km) as a time-dependent parameter, which was not a constant value as in previous studies, and it was evaluated with a four-slope gradient and three rainfall intensities. The kinematic-wave equation for overland flow was solved by an approximately semi-analytical solution based on Philip’s infiltration model, while the diffusion-based mass conversation equation for overland nutrient transport was solved numerically. The results showed that the simulated runoff processes and ammonium nitrogen concentration transport to the overland flow agreed well with the experimental data. Further correlation analyses were made to determine the relationships between the slope gradient, rainfall intensity and the hydraulic and nutrient transport parameters. It turned out that these parameters could be described as a product of exponential functions of slope gradient and rainfall intensity. Finally, a diffusion-based model with a time-dependent mass transfer coefficient was established to predict the ammonium nitrogen transport processes at the experimental site under different slope gradients and rainfall intensities.

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Section: Parameter Estimationsupporting

confidence: 90%

Section: Parameter Estimationmentioning

confidence: 99%

Mathematical Model of Ammonium Nitrogen Transport to Runoff with Different Slope Gradients under Simulated Rainfall

Xing

Yang

et al. 2019

Water

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“…A greater charge accumulates at the interfaces enhancing the polarization at the interfaces. 45 Besides, the thinner shell also plays a role in polarization enhancement but is not as signicant as the thick shell, but it is still higher than the bare BaTiO 3 particle (Fig. S17, ESI †).…”

Section: Characterization Of Core-shell Morphology and Crystalline St...mentioning

confidence: 99%

Atomic layer deposition fabricated core–shell nanostructures for enhanced polyetherimide composite dielectrics

Song

Zhang³

et al. 2022

J. Mater. Chem. A

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“…This perovskite compound under low oxygen conditions has high chemical stability and changes into a highly conductive ntype material either by adding impurities or by reducing, the material that has a high dielectric constant has important applications, especially in wireless communication technology [3][4][5]. SrTiO3 has high dielectric permittivity, low microwave loss, low leakage current, and high breakdown strength, so it has wide applications in the electronic ceramic industries and microwaves [6]. Due to the distinct optical properties possessed by strontium oxide titanate with perovskite (SrTiO3), for example, we find that the optical absorption is affected by several factors, including the ratio of defects and impurities and the grain boundaries of the surface [7,8].…”

Section: Introductionmentioning

confidence: 99%

Aerosol-Assisted Chemical Vapor Deposition (AACVD) Technique of SrTiO3: B Thin Films and Study the Structural and Optical Properties and Hall Effect Measurements

Abdul-Hussein

Hussain

Khalaf

2022

Al-Mustansiriyah Journal of Science

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Aerosol-assisted chemical vapor deposition (AACVD) technique is very precise implemented to fabrication of structured SrTiO3 and Sr1-xBxTiO3 thin films at doping ratio (x = 2, 4, 6 and 8) % at temperature 400 °C on a glass substrate. The X-Ray Diffraction (XRD) patterns illustrated that the SrTiO3 and Sr1-xBxTiO3 thin films have a polycrystalline nature and cubic structure, the detailed characterization of the films by X-ray diffraction (XRD), the Surface Morphology studied by using (AFM) and (SEM). Have been noticed from AFM measurement the Roughness and RMS were increased with increases doping ratio. The optical properties of SrTiO3 and Sr1-xBxTiO3 thin films have been studied at doping ratio (x = 2, 4, 6 and 8) % at rate (300-900) nm. The transmittance spectrum is characterized by the opposite behavior of the absorbance spectrum. The transmittance generally increases with the increase in the wavelength of radiation, at wavelengths with low energies while the absorbance decreased slowly at spectrum rate (300-900) nm i.e. in the visible region. The band gap (Eg) is decreased at (3.2 - 2.5) eV which indicates that the doping process has led to the emergence of localized levels in the region confined by the valence and conduction bands, led to a reduction in the photon energy required for direct electronic transitions to occur. Found the carriers concentration charge are holes of Sr1-xBxTiO3 thin films at doping ratio (x = 2, 4, 6 and 8) %. Many properties can be improved by adding impurities such as Boron (B) to the SrTiO3, which can be used in solar cells, electronic industries or thermoelectric generators by controlling the optical or structural properties of the material by controlling the materials and percentages of impurity, or through heat treatment of the material, such as annealing, for example or exposure to different temperatures.

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Significantly enhanced dielectric constant and breakdown strength in crystalline@amorphous core-shell structured SrTiO3 nanocomposite thick films

Cited by 15 publications

References 30 publications

Mathematical Model of Ammonium Nitrogen Transport to Runoff with Different Slope Gradients under Simulated Rainfall

Mathematical Model of Ammonium Nitrogen Transport to Runoff with Different Slope Gradients under Simulated Rainfall

Atomic layer deposition fabricated core–shell nanostructures for enhanced polyetherimide composite dielectrics

Aerosol-Assisted Chemical Vapor Deposition (AACVD) Technique of SrTiO3: B Thin Films and Study the Structural and Optical Properties and Hall Effect Measurements

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