Electrically tunable dielectric materials and strategies to improve their performances

Kong, Ling Bing; Li, S.; Zhang, T. S.; Zhai, Jiwei; Boey, Freddy Yin Chiang; Ma, Jan

doi:10.1016/j.pmatsci.2010.04.004

Cited by 257 publications

(93 citation statements)

References 190 publications

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“…Generally, dielectric loss in ceramics is due to ion migration. Temperature and frequency are important factors that influence tan δ [21]. Compared to dielectric ceramics, the low magnitudes of k and tan δ in polymer dielectrics are attractive for transistor applications and they can be used in the form of thin layers (nanometer layers) as they exhibit low leakage current and high breakdown strength, which contributes to the miniaturization of electrical devices.…”

Section: Electrical Propertiesmentioning

confidence: 99%

High-k Polymer Nanocomposites for Energy Storage Applications

Mahmood¹,

Akhtar²,

Mahmood³

2017

Properties and Applications of Polymer Dielectrics

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High dielectric (high-k) polymer nanocomposites that can electrostatically store energy are widely used in electronics and electric power systems due to their high breakdown strengths (E b ), durability, and ability to configure in various shapes. However, these nanocomposites suffer from a limited working temperature regime, thus limiting their extreme applications, such as hybrid and electric vehicles, aerospace power electronics, and deep ground fuel exploration. Furthermore, the E b and the electric displacement (D) of polymer nanocomposites must be simultaneously enhanced for high-density capacitor applications, which prove to be difficult to modify concurrently. This chapter thoroughly reviews (investigates) the recent developments in the high-k polymer nanocomposites synthesis, characterization, and energy storage applications. Consequently, the aim of this chapter is to provide an overview of the novel developmental strategies in order to develop high-dielectric nanocomposites perovskite ceramics that can be incorporated in high-energy-density (HED) applications.

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Section: Electrical Propertiesmentioning

confidence: 99%

High-k Polymer Nanocomposites for Energy Storage Applications

Mahmood¹,

Akhtar²,

Mahmood³

2017

Properties and Applications of Polymer Dielectrics

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“…Extensive efforts have been made to design materials like barium strontium titanate (Ba 1-x Sr x TiO 3 , BST), as a tunable dielectric, for the use in phase shifters, tunable filters or other tunable devices [1][2][3][4]. As has been shown by Tangantsev et al [5], BST is one of the most promising tunable dielectrics in the frequency range up to several GHz.…”

Section: Introductionmentioning

confidence: 99%

Effects of thermal processing and iron doping in co-sputtered barium strontium titanate thin films

et al. 2012

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The effects of the thermal processing and iron doping on RF magnetron co-sputtered barium strontium titanate thin film properties have been investigated. X-ray diffraction and Raman spectroscopy have been used to determine the structural evolution of the films as a function of the annealing temperature and the amount of iron dopant. X-ray photoelectron spectroscopy and electron paramagnetic resonance spectroscopy were employed to gain information about the chemical binding states and the defect structure. The enhancement of the quality factor Q, as well as the decreasing permittivity and tunability due to iron acceptor doping are demonstrated.

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“…Numerous studies focused on the improvement of BST. They investigated particularly the influence of microstructure, crystallinity, strain effects or lattice defects on the dielectric performance (Kong et al 2010). Little attention has been payed to the interaction of dopants on loss and tunability of BST thick films and bulks.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear ceramics for tunable microwave devices part I: materials properties and processing

et al. 2011

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Nonlinear dielectrics are promising materials for tunable microwave components. However, dielectric loss, tunability, and temperature dependence of such dielectrics are crucial parameters and have to be optimized for an application as microwave device. In part I of this split publication, the impact of doping and processing on the material performance of Ba 0.6 Sr 0.4 TiO 3 (BST) ceramics and thick films are presented. A phenomenological model developed by Vendik (Vendik and Zubko 2000) was used to characterize the influence of doping on the material performance of BST as tunable microwave dielectrics. It is shown that acceptor (iron, Fe)-donor (fluoride, F) codoping can positively influence the tunability of BST fundamentally. This impact is interpreted by charged defects influenced by doping and/or related defect formations. In addition to doping, it is shown that thermal treatment of powders and thick films as well as the deposition method show a strong impact on dielectric performance of the final thick-films. In the following part II, metallization, component design, and RF-characterization of tunable microwave devices will be discussed.

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Electrically tunable dielectric materials and strategies to improve their performances

Cited by 257 publications

References 190 publications

High-k Polymer Nanocomposites for Energy Storage Applications

High-k Polymer Nanocomposites for Energy Storage Applications

Effects of thermal processing and iron doping in co-sputtered barium strontium titanate thin films

Nonlinear ceramics for tunable microwave devices part I: materials properties and processing

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