Abstract:
Verfahren zur Herstellung eines Formkörpers, der wenigstens 85 Vol.-% kristallines Siliciumcarbid und maximal 15 Vol.-% Silicium enthält, umfassend die Schritte: • a) Bereitstellen eines pulverförmigen Gemisches, welches mindestens 60 Vol.-% amorphes Siliciumcarbid und maximal 40 Vol.-% Silicium mit einer Kristallitgröße von 3 - 50 nm enthält, • b) Formgebung des Gemisches durch • b1) Heißpressen oder • b2) Kompaktierung bei Raumtemperatur und nachfolgendem Sintern oder Heißpressen wobei das Sintern oder Heißpressen unter Inertgas oder Vakuum bei einer Temperatur von wenigstens 1400°C erfolgt. Das Volumenverhältnis SiC:Si im pulverförmigen Gemisch ist 95:5 - 99:1.
Abstract:
Es wird ein Leuchtstoff umfassend eine anorganische Verbindung angegeben. Die anorganische Verbindungweist in ihrer Summenformel zumindest einen Aktivator E und N und/oder O auf, wobei E aus einer Gruppe ausgewählt ist, die Mn, Cr, Ni, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Yb, Tm, Li, Na, K, Rb, Cs und Kombinationen daraus umfasst. Die anorganische Verbindung kristallisiert in einer Kristallstruktur mit gleicher Atomsequenz wie in K 2 Zn 6 O 7 .
Abstract:
Provided are a barium titanate-based piezoelectric ceramics having satisfactory piezoelectric performance and a satisfactory mechanical quality factor (Qm), and a piezoelectric element using the same. Specifically provided are a piezoelectric ceramics, including: crystal particles; and a grain boundary between the crystal particles, in which the crystal particles each include barium titanate having a perovskite-type structure and manganese at 0.04% by mass or more and 0.20% by mass or less in terms of a metal with respect to the barium titanate, and the grain boundary includes at least one compound selected from the group consisting of Ba4Ti12O27 and Ba6Ti17O40, and a piezoelectric element using the same.
Abstract translation:提供一种具有令人满意的压电性能和令人满意的机械品质因数(Qm)的钛酸钡基压电陶瓷,以及使用它的压电元件。 具体提供的是压电陶瓷,包括:晶体颗粒; 晶体粒子各自包含钛酸钙,钛酸钙,钛,钛,钛,钛,钛,钛,钛,钛, 钛酸盐,并且晶界包括至少一种选自Ba 4 Ti 12 O 27和Ba 6 Ti 17 O 40的化合物和使用其的压电元件。
Abstract:
The invention relates to a light emitting device, especially a LED comprising a green emitting material of the composition Sr 5-y-z-a M y Si 23-x ,Al 3+x O x+2a N 37-x- 2a :Eu z :Ce z1 . This material has been found to have a narrow emission in the green wavelight range together with a good producibility and stability.
Abstract:
Refractory ceramic possessing a solidus temperature between 25000°C and 28000°C having a compactness greater than 85%, the microstructure of said ceramic being such that it is composite and comprises: hafnium dioxide HfO2 grains of monoclinic structure (1); hafnium dioxide HfO2 grains of cubic structure (2) stabilized by yttrium oxide Y2O3, the yttrium oxide Y2O3 representing 0, 5 mol % to 8 mol % relative to the total number of moles of hafnium dioxide HfO2; closed pores (3) and non-interconnected open pores. The invention also relates to the process for manufacturing said ceramic and to a structural part incorporating said ceramic.
Abstract:
The present invention relates to the use of chemically stable solid ion conductors having a garnet-like structure in batteries, accumulators, electrochromic devices and other electrochemical cells and also new compounds which are suitable for these uses.
Abstract:
本発明は、エネルギー変換効率が良好な熱電変換素子に有用な熱電変換材料およびその製造方法を提供する。熱電変換材料は、Ti、MおよびOを含有する酸化物からなる熱電変換材料であって、酸化物が式(1)で表される。 Ti 1-x M x O y (1)Mは、V、NbおよびTaからなる群より選ばれる少なくとも1つであり、xは0.05以上0.5以下であり、yは1.90以上2.02以下である。
Abstract:
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.