Abstract:
The present invention relates to compounds of formula I, M I M II 3 M III 3 M IV 3 N 2 O 12 :Eu I wherein, M I , M II , M II , and M IV have one of the meanings as given in claim 1, to a process of their preparation, the use of these compounds as conversion phosphors or in an emission-converting material, the use of these phosphors in electronic and electro optical devices, such as light emitting diodes (LEDs) and solar cells, and especially, to illumination units comprising at least one of these phosphors.
Abstract:
MAX phase materials without any content of the elements A1 and Si, having the chemical formula M n+1 AX n , where M is a transition metal selected among elements from group Ib up to and including group VIIb plus group VIII of the periodic table, n = 1, 2 or 3, X is C and/or N and/or B and/or O, and A is one or more elements selected from Ga, Ge, As, Cd, In, Sn, Tl and Pb. The materials are suitable for use i.a. in membranes, filters, sensors, electrical contacts, batteries, fuel cell systems such as solid oxide fuel cell (SOFC) systems and electrolysis cell systems such as solid oxide electrolysis cell (SOEC) systems.
Abstract:
The present invention relates to a new process for the production of a solid oxide electrolyte for fuel cells and comprises the following steps of: a) mixing powders of La203, Si02, and Ge02 by high energy milling, in a controlled atmosphere, using variable rotational speeds between 150 and 350 rpm and milling times between 15 h and 35 h, in order to obtain the desired oxyapatite phase; b) compaction of the resulting mixture either by uniaxial pressing, with pressures in the range 390-885 MPa or by cold isostatic pressing, with pressures ranging from 200 to 320 MPa, in order to obtain compacts with green densities between 65 and 75% of the theoretical density; c) sintering of the compacts in a microwave oven with frequencies between 2 and 3 GHz, power rating equal or higher than lkW, temperatures up to 1350 °C and sintering times from 5 minutes to 60 minutes, using silicon carbide susceptors, capable of absorving the microwaves from the room temperature and d) cooling of the sintered compacts in the furnace, under an argon atmosphere with a flowing rate of 2-10 L/min.
Abstract:
Lithium-ion-conducting ceramic materials are disclosed having characteristics of high lithium-ion conductivity at low temperatures, good current efficiency, and stability in water and corrosive media under static and electrochemical conditions. Some general formulas for the lithium-ion-conducting materials include M I 1+x+z-δ M III x M IVa y M IVb 2-x-y M V z P 3-z O 12 and M I 1+x+4z-δ M III x M IVa y M IVb 2-x-y-z P 3 O 12 , wherein M I comprises Li, Na, or mixtures thereof; 0.05 IVa comprises Zr, Ge, Sn, or mixtures thereof; M IVb comprises Ti; and M V comprises Si, Ge, Sn, or mixtures thereof. In some cases, the lithium-ion conducting materials are formed through a process in which the materials' powdered precursors are milled after being calcined and before being sintered. The milling process may include using milling media of multiple sizes.
Abstract translation:公开了在静态和电化学条件下具有低的锂离子传导性,电流效率好以及水和腐蚀性介质中的稳定性的锂离子导电陶瓷材料。 用于锂离子传导材料的一些通式包括MI 1 + x + z-δMIIIxMIVa yMIVb 2-x-yMV zP 3-zO 12和MI 1 + x + 4z-δMIIIxMIVa yMIVb 2-xy-zP 3 O 12,其中MI包括 Li,Na或其混合物; 0.05
Abstract:
A method of forming a solid, dense, hermetic lithium-ion electrolyte membrane comprises combing an amorphous, glassy, or low melting temperature solid reactant with a refractory oxide reactant to form a mixture, casting the mixture to form a green body, and sintering the green body to form a solid membrane. The resulting electrolyte membranes can be incorporated into lithium-ion batteries.
Abstract:
A framework for developing high quality factor (Q) material for electronic applications in the radio frequency range is provided. In one implementation, ceramic materials having a tungsten bronze crystal structure is modified by substituting one or more elements at one or more lattice sites on the crystal structure. The substitute elements are selected based on the ionic radius and other factors. In other implementations, the modified ceramic material is prepared in combination with compositions such as rutile or a perovskite to form a orthorhombic hybrid of perosvkite and tetragonal tungsten bronze.
Abstract:
Phosphors based on doping of an activator (an emitter) into a host matrix are disclosed herein. Such phosphors include alkaline gallate phosphors doped with Cr 3+ or Ni 2+ ions, which in some embodiments can exhibit persistent infrared phosphorescence for as long as 200 hours. Such phosphors can be used, for example, as components of a luminescent paint.
Abstract:
The present invention provides porous body precursors and shaped porous bodies. Also included are catalysts and other end-use products based upon the shaped porous bodies and thus the porous body precursors. Finally, processes for making these are provided. The porous body precursors are germanium doped and comprise a precursor alumina blend. It has now surprisingly been discovered that inclusion of germanium, alone or in combination with such a blend, in porous body precursors can provide control over, or improvements to, surface morphology, physical properties, and/or surface chemistry of shaped porous bodies based thereupon. Surprisingly and advantageously, heat treating the shaped porous bodies can result in additional morphological changes so that additional fine tuning of the shaped porous bodies is possible in subsequent steps.