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Dielectric loss
About: Dielectric loss is a research topic. Over the lifetime, 20296 publications have been published within this topic receiving 349254 citations.
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TL;DR: Using citric acid and ethylene glycol, a polymeric precursor of the above compound was obtained at low temperatures (135 °C) which on subsequent heat treatments led to pure CaCu 3 Ti 4 O 12 at 1000 °C as mentioned in this paper.
109 citations
TL;DR: In this article, a basic characterization of several low-temperature-sintered calcium silicates, germanates and tellurates was performed to evaluate their potential as glass-free low-permittivity substrate LTCC materials.
Abstract: To reduce the complexity of LTCC systems, and so accelerate the development of LTCC tapes with new functionalities, it is necessary to reduce the number of phases within a particular tape. This can best be done by using glass-free single-phase ceramic systems. We performed a basic characterization of several low-temperature-sintered calcium silicates, germanates and tellurates in order to evaluate their potential as glass-free low-permittivity substrate LTCC materials. Special attention was focused on their microwave and 1 MHz dielectric properties, their sintering behavior and their compatibility with Ag. Two Ca-germanates, which were found to be the most interesting for LTCC applications exhibit a permittivity of ∼10 and low dielectric losses; however, the temperature dependence of permittivity and the sintering temperature must be further reduced. For CaGeO3 the temperature dependence of permittivity was fully suppressed by the addition of 10 mol% of CaTiO3.
109 citations
TL;DR: In this paper, the effects of sintering conditions on microstructure, phase structure, and dielectric properties of Y2/3Cu3Ti4O12 ceramics were investigated in detail.
Abstract: Y2/3Cu3Ti4O12 ceramics were successfully prepared by the conventional solid-state reaction method. Effects of sintering conditions on microstructure, phase structure, and the dielectric properties of Y2/3Cu3Ti4O12 ceramics were investigated in detail. Y2/3Cu3Ti4O12 ceramics sintered at 1010°C for 25 h exhibited a giant dielectric constant (1.10 × 104) and a relatively low dielectric loss (0.033) around room temperature. The samples showed good temperature stability (ΔCT/C25∘C=-6.7% – 9.5%) in the temperature range from −60°C to 125°C at 10 kHz. It was also found that a new dielectric relaxation III appeared at higher temperatures (>200°C). The complex impedance spectroscopy analysis suggested that Y2/3Cu3Ti4O12 ceramics were electrically heterogeneous, and they consisted of semiconducting grains and insulating grain boundaries, which could be modeled to a first approximation on an equivalent circuit based on two parallel RC elements connected in series. The Cu2+/Cu3+ and Ti3+/Ti4+ aliovalences were observed in Y2/3Cu3Ti4O12 ceramics. The giant permittivity phenomenon could be explained by internal barrier layer capacitance (IBLC) effect.
109 citations
TL;DR: In this article, six glasses with different molar ratios of CaO/B2O3/SiO2 (designed as CBS-3, CBS-5 and CBS-6) were prepared and pulverized, and they were sintered at different temperatures to reach maximum densification.
109 citations
TL;DR: SiC was infiltrated into porous yttria-stabilized zirconia (YSZ) felt by chemical vapor infiltration (CVI), and continuous SiC matrix layer was formed around YSZ fibre.
109 citations