Semiconductivity, ceramic materials

Space Charge Layers in Semiconducting Ceramic Materials 699... 

The work on colour centres outlined in Section 3.2.3.1, much of it in the 1930s, and its consequences for understanding electrically charged defects in insulating and semiconducting crystalline materials, helped to stimulate ceramic researches in the electrical/electronic industry. The subject is enormous and here there is space only for a cursory outline of what has happened, most of it in the last 80 years. 

A Partially Conductive and a Partially Semiconductive Ceramic.. 182 7.5 Materials Contrasts in the SFM Non-Contact Mode. 185... 

Science of catalysts has much to learn from materials science of metals, alloys, ceramic materials, and semiconducting materials. In turn, because catalytic science is practiced on a molecular nanostructure and surface submonolayer scale, it is one that is at the cutting edge of materials science in general and will no doubt have its impact on the technology of new, catalytic and non-catalytic materials. This symposium volume demonstrates that the field is well and alive and that progress toward a scientific catalyst design is substantial. 

For good response time and accuracy, the sensitive material should be porous and as thin as possible, and the ceramic temperature needs to be in the range of 600-1000 °C. These requirements are met by applying the semiconducting ceramics as porous thick-film layers on a heated A1203 substrate. 

Azad A-M, Hammond M. Thermodynamically-driven reconstitution of semiconducting ceramic oxides. In Jackson MJ, Ahmed W, editors. Proceedings of the fourth international surface engineering congress and exposition, August 1-3, 2005. St. Paul, MN ASM International, Materials Park, OH 2006, p. 231-240. 2006. ISBN 0-87170-835-31. 

Periodic Table of the Elements Periodic Table of Elements in Metallic Materials Periodic Table of Elements in Ceramic Materials Periodic Table of Elements in Polymeric Materials Periodic Table of Elements in Semiconducting Materials Periodic Table of Elements in Superconducting Metals... 

Some LB films exhibit a temperature-dependent pyroelectric coefficient that makes them candidates for thermal imaging applications (1). Both X- and Z-type films and alternating Y-type films (Fig. 6) can be built with permanent polarization, whose magnitude is often temperature-dependent. Their pyroelectric coefficient p is small relative to standard semiconducting and ceramic materials, but so is their permittivity e this makes their ratio p/s, the figure of merit, comparable to that as for currently employed inorganic materials. The advantage of LB methods is that they can be used to prepare very thin, very uniform films. 

ISO 22197-1 2007 Fine ceramics (advanced ceramics, advanced technical ceramics) - Test method for air-purification performance of semiconducting photocatalytic materials - Part 1 Removal of nitric oxide... 

Electrical and Electronic Applications. Silver neodecanoate [62804-19-7] has been used in the preparation of a capacitor-end termination composition (110), lead and stannous neodecanoate have been used in circuit-board fabrication (111), and stannous neodecanoate has been used to form patterned semiconductive tin oxide films (112). The silver salt has also been used in the preparation of ceramic superconductors (113). Neodecanoate salts of barium, copper, yttrium, and europium have been used to prepare superconducting films and patterned thin-fHm superconductors. To prepare these materials, the metal salts are deposited on a substrate, then decomposed by heat to give the thin film (114—116) or by a focused beam (electron, ion, or laser) to give the patterned thin film (117,118). The resulting films exhibit superconductivity above Hquid nitrogen temperatures. 

The PTC materials already mentioned depend directly on the ferroelectric phase transition in solid solutions based on BaTi03, suitably doped to render them semiconducting. This is a typical example of the interrelations between different electrical phenomena in ceramics. 

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