Dielectric inorganics ceramic

Dias, C. J., and Das Gupta, D. K., Inorganic ceramic/polymer ferroelectric composite electrets, IEEE Trans. Dielectr. Electr. Insul., 3, 706-734 (1996). 

Detaint J, Philippot E, Jumas JC, Schwartzel J, /.arka A, Capelle B, Doukhan JC (1985) Crystals growth, physical characterization and BAW devices appUcations of berUnite. Proceedings of 39th Annual Frequency Control Symposium, pp 234—246 Devonshire AF (1949) Theory of Barium Titanate Part I. Phil Mag 40, Serie 7, 309 1040-1063 Devonshire AF (1951) Theory of Barium Titanate Part II. Phil Mag 42, Serie 7, 333 1065-1079 Dias CJ, Das-Gupta DK (1996) Inorganic ceramic/polymer ferroelectric composite electrets. IEEE Trans Dielectr Electr Insul 3 706 734... 

The absorption of water by polymers is especially suited to the development of a capacitive humidity sensor based on the high dielectric constant of water, since capacitance depends on the area, the thickness, and the dielectric constant of a dielectric. Uptake of water causes an increase in the dielectric constant followed by an increase in capacitance. Polyimide is a suitable sensitive material, but so are certain inorganic ceramics such as AI2O3 [142] and low-density Ta205, which change their capacitance with the formation of water dipoles. Low-density Ta20s layers can be formed by anodic oxidation of sputtered tantalum films, whereas polyimide films are deposited by spin coating and subsequent polymerization. 

Adhesion of polyimides to inorganic substrates is of great importance to the microelectronics industry [1, 2]. The polyimide films are deposited most often by spin coating the polyamic acid (PAA) usually from a TV-methylpyrrolidone (NMP) solution onto the substrate surface followed by thermal imidization at temperatures up to 400<>C. The most studied polyimide is the pyromellitic dianhydride-oxydianiline (PMDA-ODA), which exhibits excellent mechanical and dielectric properties, but not so good adhesion characteristics. The latter has been generally overcome by application of an adhesion promoter, such as y-aminopropyltriethoxysilane [3-7]. The reactions of APS (coated from water solution) with the silicon dioxide surface as well as with polyamic acid have been well characterized by Linde and Gleason [4] however, we do not have such detailed information available on APS interaction with other ceramic surfaces. 

Considerable interest also has been directed at the use of multicomponent composites where, in theory, the most useful properties from each phase can be realized in the whole. This includes metallodielectric structures where a metallic phase imparts, for example, a high index or more exotic effect (e.g., plasmon resonance) and a low-loss or property-tunable dielectric phase. The dielectric phase can be ceramic or polymeric and also has included ferroelectric polymers, embedded nanoparticles, and organic/inorganic hybrids. ... 

Inorganic nanoflllers such as clays or ceramics may improve mechanical properties and dielectric properties. An abundant literature has been devoted to layered silicates for applications in the biomedical domain, hydroxyapatite (HAp e.g., nanoparticles of 300 nm in Figure 13.1a) might be of interest. Ferroelectric ceramics are attractive for their high dielectric permittivity and electroactive properties. As an example, BaTiOa particles with d 700 nm are shown in Figure 13.1b. Conductive nanoparticles should induce electrical conductivity in polymeric matrices, but to preserve the mechanical properties, small amount should be used. Consequently, there is great interest in conductive nanotubes [i.e., carbon nanotubes (CNTs)], which exhibit the highest... 

Radiation gradually deteriorates certain plastic film and ceramic dielectrics (Lindquist, 1977). Organic dielectrics are more susceptible than inorganic dielectrics. Radiation reduces the insulation resistance and decomposes impregnates in paper... 

Larbot A., Fabre J.-P, Guizard C., Cot L., Gillot J. New inorganic ultrafiltration membranes titania and zirconia membranes. J. Am. Ceram. Soc. 1989 72 257-261 Lee B., Zhang J. Preparation, structure evolution and dielectric properties ofBaTiOs thin films and powders by an aqueous sol-gel process. Thin Solid Films 2001 388 107-113 Lee D.-S., Liu T.-K. Preparation ofTi02 sol using TiC as a precursor. J. Sol-Gel Sci. Technol. 2002 25 121-136... 

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