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Thin-Film Design Guidelines
Published in Roydn D. Jones, Hybrid Circuit Design and Manufacture, 2020
Dielectrics that have been used for thin-film capacitors are silicon monoxide (εr= 6), aluminum oxide (εr= 10), and tantalum pentoxide (εr = 26). Silicon monoxide and aluminum oxide are usually sputtered, whereas tantalum pentoxide is usually formed by thermal or anodic oxidation of a tantalum film. The original tantalum film forms the bottom electrode. Because of the thin layers of dielectric the breakdown voltages are usually low and the yield loss due to pinhole shorts is also a problem. Often, a dual dielectric consisting of silicon monoxide and one of the other dielectrics is used to reduce yield losses and increase voltage breakdown. However, this will obviously result in lower capacitance per unit area.
Passive electronic components
Published in Stephen Sangwine, Electronic Components and Technology, 2018
The two most common electrolytic capacitor types are made from either aluminium or tantalum. Aluminium electrolytics consist of two aluminium foil electrodes, one of which has an aluminium oxide film formed on its surface, separated by a wet or paste electrolyte. They are characterized by a wide tolerance on initial value, considerable capacitance variation with temperature, and a short life at high temperatures. Their capacitance decreases with age. Tantalum electrolytic capacitors can be made with foil electrodes and wet electrolyte in the same way as aluminium electrolytics. They can also be made with a solid dry electrolyte, achieving long life and high reliability at reasonable cost. The dielectric film is tantalum pentoxide, formed in a thin layer and with large surface area by sintering tantalum powder into a solid slug or bead anode that is coated with carbon and then metal-plated to form the cathode contact.
Passive Components
Published in Richard C. Dorf, Circuits, Signals, and Speech and Image Processing, 2018
Michael Pecht, Pradeep Lall, Glen Ballou, C. Sankaran, Nick Angelopoulos
Tantalum capacitors have as much as three times better capacitance per volume efficiency than aluminum electrolytic capacitors, because tantalum pentoxide has a dielectric constant three times greater than that of aluminum oxide (see Table 1.4).
Influence of hydroxyapatite composite coating on the textured surface of patient specific dental implant: An in silico 3D finite element study
Published in Mechanics of Advanced Materials and Structures, 2022
Vamsi Krishna Dommeti, Sumit Pramanik, Sandipan Roy
It has also been observed that mechanical behaviors of the dental implant depend on bone quality and surface roughness. However, there is a gap to be addressed for the effect of texturing with coating materials and bone quality. Therefore, the main objective of the present study is to check the mechanical influence of different types of surface texturing on implant surface using different types of hybrid coating material. Also, it aims to check the influence of hybrid coating effect in the bone quality with implants. It is to be informed that various literatures had studied about the impact of single material coating on the solid non-textured implant surfaces of Sr, silver (Ag), zinc (Zn) and magnesium (Mg). But, it is important to understand the impact of hybrid coating on the textured implant surface. Therefore, the effect of hybrid coating on the textured implant surface as well as on bone quality are to be known. In this study, coating material formations were considered hydroxyapatite (HA), HA + 3% tantalum pentoxide (HA3TO), HA + 3%strontium (HA3Sr), HA + 1.5% tantalum pentoxide + 1.5% strontium (HA1.5TO1.5Sr), respectively, for the better osseointegration and bone formation.
Controllable antimicrobial properties of silver ion-exchanged niobate and tantalate compounds
Published in Journal of Asian Ceramic Societies, 2022
Withanage Isuru Udakara Withanage, Kuda Durayalage Sulasa Devi Ariyapala, Nobuhiro Kumada, Takahiro Takei, Mayu Ueda, Mamoru Aizawa
Pyrochlore-type KN and KT were synthesized by a hydrothermal reaction using niobium pentoxide (Nb2O5), tantalum pentoxide (Ta2O5), and potassium hydroxide (KOH) as starting materials according to a previously described method [23]. All chemicals were purchased from Kanto Chemical Co., Ltd. (Tokyo, Japan). Ag ions were doped into KN and KT by an ion exchange process using small molar ratios and gradually increased to obtain completely ion-exchanged samples. To achieve this, the parent compounds [KN and KT] were mixed with different molar ratios of AgNO3, and the resultant mixtures were heated at 300°C for 6 h. Moreover, the ion-exchanged molar ratios of AgNO3/ KN or KT were 0.1, 0.5, and 5.0. The products were filtered, centrifuged several times, and dried at 60°C for 24 h. The final products were denoted as KAN1, KAN2, and KAN3 for KN ion-exchange and KAT1, KAT2, and KAT3 for KT ion-exchange.
Characterization and analysis of sediments in stormwater drainage for reuse
Published in Journal of Applied Water Engineering and Research, 2021
Carlos Peña-Guzmán, Jeimmy Cárdenas, Amelia Pérez, Andrés Torres, Karen Mora-Cabrera
The PCA allowed us to eliminate variables that did not contribute to the statistical model: depth, volatile solids, humidity, percent sand, percent clay, shear stress, length of pipe, diameter of pipe, differences in levels and slopes, along with the following compounds: chromium oxide (CrO), strontium oxide (SrO), manganese dioxide (MnO2), vanadium oxide (V2O5), nickel oxide (Ni2O3), lead oxide (Pb3O4), actinium oxide (Ac2O3), gold oxide (Au2O3), germanium monoxide (GeO), rubidium oxide (Rb2O), yttrium oxide (Y2O3), samarium oxide (Sm2O3), zirconium dioxide (ZrO2), caesium oxide (Cs2O), polonium dioxide (PoO2), europium oxide (Eu2O3), barium oxide (BaO), tantalum pentoxide (Ta2O5), and lutetium oxide (Lu2O3) because their percentage in the sediments was less than 0.01%. Finally, the statistical analyses were conducted using 17 variables (3 qualitative and 13 quantitative).