Abstract: In accordance with a method for producing chromium retention layers for components of solid oxide fuel cells (SOFCs) made of chromium-containing alloys, the aluminum-containing component surface is subjected to elevated temperatures so that a gas-tight chromium retention layer forms. The layer produced in this manner effectively prevents vaporization of chromium from the basic material. Defects in the layer remedy themselves during operation of the fuel cell.

Abstract: The invention relates to a ceramic material comprising at least one transition metal silicate and/or transition metal disilicate. The ceramic material can be characterized by having one or more monosilicates, one or more disilicates and mixtures consisting of monosilicates and disilicates.

Abstract: The invention relates to a ceramic material comprising at least one transition metal silicate and/or transition metal disilicate. The ceramic material can be characterized by having one or more monosilicates, one or more disilicates and mixtures consisting of monosilicates and disilicates.

Abstract: A small modulation current is applied to the light source of a Sagnac-type fiber optic gyroscope to increase accuracy and/or stability of scale factor (open loop configuration) and to reduce bias errors and random walk (closed-loop configuration). The phase and amplitude of the modulation current are controlled through a control circuit whose reference is picked off at a first beamsplitter in series with the light source. In such a way, light emitted from the light source into the interferometer contains no modulation. The elimination of modulation removes a source that would otherwise cause deterioration of gyroscope stability resulting from light returning from the interferometer or due to electrical interference, thus limiting measurement accuracy.

Abstract: A boundary layer structure, useful in a fuel cell, includes a solid electrolyte and an electrode. The electrode consists essentially of a perovskite base material and a platinum group metal oxide addition, along the boundary between the perovskite and the electrolyte. Iridium oxide is a preferred metal oxide addition material, while a preferred perovskite is lanthanum ferrite, which contains Sr and either Co or Mn.

Abstract: A high-temperature reactor with a reactor core containing fuel elements crossed by a cooling gas circuit comprises a malfunction filter for filtering metal fission products discharged from the fuel elements in the event of core overheating. The filter is mounted in the cooling gas circuit outside the reactor core and consists of a carbon which is incompletely graphitized, or is not graphitized at all.