All-ceramic lead-free percolative composite with a colossal dielectric response

Bobnar, V.; Hrovat, Marko; Holc, Janez; Kosec, Marija

doi:10.1016/j.jeurceramsoc.2008.07.023

Cited by 7 publications

(3 citation statements)

References 24 publications

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“…The dielectric permittivity of ceramic-metal composites is enhanced by increasing the metal content within the ceramic matrix, especially near the percolation threshold, which is the transition point from electrically insulating to conducting. The enhanced εr' at this critical point can be mathematically expressed according to percolation theory as the power law [12,15,31,35], in our case as: The dielectric permittivity of ceramic-metal composites is enhanced by increasing the metal content within the ceramic matrix, especially near the percolation threshold, which is the transition point from electrically insulating to conducting. The enhanced ε r ' at this critical point can be mathematically expressed according to percolation theory as the power law [12,15,31,35], in our case as:…”

Section: Resultsmentioning

confidence: 99%

“…When an external electric field is applied, the free electrons from the embedded metal particles move to the metal/insulator interfaces, acting as additional electric dipoles, therefore increasing the total dielectric permittivity. This is known as Maxwell-Wagner polarization [10][11][12]. By increasing the metallic content within the matrix, ε r also increases.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Structural and Electrical Properties of Al2O3/Al Composites Prepared by Aerosol Co-Deposition

et al. 2023

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As the microelectronic industry develops, components that can perform several different tasks receive increasingly more attention, resulting in multifunctional materials being highly sought after. Al2O3 is widely present in electronic applications as a protective coating or as an electrical and thermal insulator due to its mechanical and thermal stabilities and chemical inertness. Al2O3 is also an important dielectric material, with high resistivity and stable permittivity over a wide range of temperatures and electric fields, but its modest permittivity necessitates large effective areas or extremely thin layers when a large capacitance is desired. Composites consisting of discrete conducting phases within an insulating matrix can produce large capacitance via Maxwell–Wagner polarization. In this work, Al2O3/Al composite thick films with different volume ratios of Al were prepared using the aerosol deposition method. A relative dielectric permittivity (εr′) of 800 at 1 MHz was achieved at 27 vol% of Al, a sixty-sevenfold enhancement compared to Al2O3. On the other hand, dielectric losses, tan(δ), at 1 MHz increased from 0.01 for Al2O3 up to 0.58 for the composite with 27 vol% of Al. A finite-element model of the composites was implemented, supporting the nonlinear electrical behavior of the composites as function of vol% of Al. Our results show novel possibilities for the applications of Al2O3-based materials in the microelectronic industry, especially for temperature-sensitive applications, for which the integration strengths of aerosol deposition are valuable.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of Structural and Electrical Properties of Al2O3/Al Composites Prepared by Aerosol Co-Deposition

et al. 2023

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“…Thus, K 0.5 Na 0.5 NbO 3 -RuO 2 (KNN-RuO 2 ) lead-free percolative composite has also been developed (Bobnar et al, 2009b): RuO 2 is a very good electrical conductor with the resistivity of 40×10 -8 Ωm (van Loan, 1972) and it has been found that there is no reaction between KNN and RuO 2 at temperatures even higher than 1000ºC. K 0.5 Na 0.5 NbO 3 powder was prepared by solid-state synthesis from K 2 CO 3 , Na 2 CO 3 , and Nb 2 O 5 .…”

Section: Processing and Structural Analysismentioning

confidence: 99%