摘要:
Procédé de préparation d'une céramique semi-conductrice comprenant, de préférence constituée par au moins un oxyde de métal de base, qui est un oxyde simple d'un seul métal de base, et au moins un oxyde de métal dopant, ladite céramique présentant une porosité inférieure ou égale à 5%, de préférence inférieure ou égale à 3%, de préférence encore inférieure ou égale à 1%, dans lequel on réalise les étapes successives suivantes : - on fournit une poudre constituée par un ou plusieurs oxydes de métal de base, le ou lesdits oxydes étant des oxydes simples, d'un seul métal de base, un ou plusieurs métaux de base sous forme métallique non oxydée, un ou plusieurs oxydes de métaux dopants, et éventuellement un ou plusieurs métaux dopants sous forme métallique non oxydée ; - on met en forme ladite poudre ; - on fritte la poudre mise en forme. Ladite céramique semi-conductrice peut être utilisée pour fabriquer des résistances non linéaires en fonction de la tension et notamment des varistances.
摘要:
Methods to form metal oxide material are described. In one process, an oxide film on a metal material is diffused throughout the metal material to form a preferred uniform metal oxide material. The present invention further relates to products formed by the process. Also, the present invention relates to the use of the products in capacitor anodes and other applications.
摘要:
Die Erfindung betrifft ein Verfahren zur Herstellung von Mischoxid in Nanostruktur mit hoher elektrischer Leitfähigkeit, beispielsweise Indium-Zinn-Oxid, sowie ein Oxidpulver, einen Festkörper und seine Verwendung als Sputtertarget. Das Oxid wird durch eine kontinuierliche und direkte Oxidation hergestellt, Wobei ein Metall-oder Halbleiterwerkstoff die Funktion einer Abschmelzelektrode in einem Sauerstoffplasma erfüllt. Die Synthesereaktion wird bei sehr hoher Temperatur ausgelöst, woran sich ein thermischer Zustand anschliesst, der so gesteuert wird, dass sich eine fehlerfreie kristalline Struktur ergibt, die eine hohe Beweglichkeit elektrischer Ladungen gestattet.
摘要:
A method of forming an oxide on a substrate. According to the method of the present invention a substrate is placed in a chamber. An oxygen containing gas and a hydrogen containing gas are then fed into the chamber. The oxygen containing gas and the hydrogen containing gas are then caused to react with one another to form water vapor in the chamber. The water vapor then oxidizes the substrate.
摘要:
The object of the invention is a method for preparing an oxide (P), which includes the steps of (i) forming a solid phase compound (O) based on an oxide containing molecular entities (1) chosen from optionally substituted ammonium, diammonium, diazan-ium or diazan-dium, said entities being distributed within the solid matrix, and (ii) eliminating the entities (1) from said solid phase compound (O) by reacting the solid phase compound (O) with a gaseous stream containing a break-down reactant for said entities (1), and, finally, isolating the resulting solid material (P). Oxides with a novel structure are thereby obtained, particularly tungsten or vanadium oxides, useful in catalytic processes or for energy storage.
摘要:
Hierarchical nanostructures and methods of fabrication. The structures include particles having a metal oxide outer shell with metal oxide wires extending from the outer shell. A multiscale structure according to the invention has particles above and below a critical size wherein the particles above the critical size have wires extending from the surface. These structures may be fabricated from a mixture prepared of relatively smaller metal particles having a size threshold below a threshold for nanowire formation and of relatively larger metal particles having a size above the threshold for nanowire formation. The mixture is oxidized at a selected temperature and for a selected time whereby the relatively smaller particles sinter and nanowires grow on the relatively larger particles thereby creating tunable hierarchical structures with metal-to-metal contact between the particles.
摘要:
Nanoscale materials comprised of metal or metal oxide which are in the form of fibers or tubes or which have a porous structure can be prepared using composite fibers containing admixtures of polymers and metal precursors and/or metal oxide precursors.
摘要:
Multi-step metal compound oxidation process to produce compounds and enhanced metal oxides from various source materials, e.g. metal sulfides, carbides, nitrides and other metal containing materials with metal oxides from secondary reaction steps being utilized as an oxidation agent in the first reactions.
摘要:
A nanostructure comprising a core material of a nanometric size surrounded by an envelope of ordered fluid molecules is disclosed. The core material and the envelope of ordered fluid molecules are in a steady physical state. Also disclosed, a liquid composition comprising liquid and the nanostructure.
摘要:
Nanoscale (less than 100 nm) ferroelectric materials are provided using a facile, largescale, environmentally friendly solid-state reaction. Specifically, the solid-state reaction produces perovskite nanowires, perovskite nanocubes, and/or perovskite nanoparticles which can be employed in numerous electronic applications. The solid-state reaction includes reacting a perovskite precursor, i.e., metal oxalate(s), and a metal oxide nanostructural template in the presence of an alkali salt and a surfactant.