Abstract: Amorphous silicon carbon composite particles contain, as components of the particles, 85 to 99.63 wt.-% silicon content, 0.3 to 15 wt.-% carbon content, and at least 0.07 wt.-% hydrogen content, where the components sum up to 100 wt.-%. The carbon content in the area beneath the surface of the particles, starting from the surface and reaching up to at least 30 nm from the surface in a direction to the centre of the particles, is at least 3 wt.-% higher than in the area of the centre of the particles. The area of the centre is the remaining part of the particles and is directly joined to the area beneath the surface.

Abstract: A body has multiple phases, which have different electron spin resonance spectra that do not result from the simple combination of the ESR spectra of each individual phase.

Abstract: A method of unambiguous identification and authentication of products for the purpose of better recognition of product forgeries and controlling product piracy, including applying to/into the product an identification substance admixture which contains paramagnetic phases or identifying a product which contains an identification substance admixture containing paramagnetic phases and has an ESR fingerprint spectrum that permits unambiguous identification of the product. Such an ESR fingerprint spectrum is easily measurable, but can be copied or forged only with difficulty. The method relates to an individualizable “femto tag” for femto ledgers and forms an important interface for what are known as “Internet of Things” (IOT).

Abstract: A silicon-carbon composite powder having Si and C distributed throughout each particle is provided. The weight ratio of carbon to silicon on the surface of a particle (C/Si)surface is greater than the weight ratio of carbon to silicon within the total particle (C/Si)total. The silicon-carbon composite powder is produced by simultaneously feeding into a reactor a gaseous stream of a SiH4, Si2H6, Si3H8 and/or organosilane and a gaseous stream of at least one hydrocarbon of ethylene, ethane, propane and acetylene and reacting the streams using plasma enhanced chemical vapor deposition.

Abstract: Process for producing a silicon-carbon composite powder in which a) a gas stream A containing at least one starting compound of silicon selected from the group consisting of SiH4, Si2H6 and Si3H8, and b) a gas stream B containing at least one starting compound of carbon selected from the group consisting of methane, ethane, propane, ethylene and acetylene are reacted in a hot wall reactor at a temperature of less than 900° C., the reaction mixture is cooled or allowed to cool and the pulverulent reaction product is separated from gaseous materials.

Abstract: A body has multiple phases, which have different electron spin resonance spectra that do not result from the simple combination of the ESR spectra of each individual phase.

Abstract: Process for producing a silicon-carbon composite powder in which a) a gas stream A containing at least one starting compound of silicon selected from the group consisting of SiH4, Si2H6 and Si3H8, and b) a gas stream B containing at least one starting compound of carbon selected from the group consisting of methane, ethane, propane, ethylene and acetylene are reacted in a hot wall reactor at a temperature of less than 900° C., the reaction mixture is cooled or allowed to cool and the pulverulent reaction product is separated from gaseous materials.

Abstract: A silicon-carbon composite powder having Si and C distributed throughout each particle is provided. The weight ratio of carbon to silicon on the surface of a particle (C/Si)surface is greater than the weight ratio of carbon to silicon within the total particle (C/Si)total. The silicon-carbon composite powder is produced by simultaneously feeding into a reactor a gaseous stream of a SiH4, Si2H6, Si3H8 and/or organosilane and a gaseous stream of at least one hydrocarbon of ethylene, ethane, propane and acetylene and reacting the streams using plasma enhanced chemical vapor deposition.

Abstract: The invention relates to a method for producing a shaped body that contains at least 85 vol. % crystalline silicon carbide and at most 15 vol. % silicon, comprising the following steps: a) providing a powdered mixture that contains at least 60 vol. % amorphous silicon carbide and at most 40 vol. % silicon having a crystallite size of 3-50 nm; b) shaping the mixture by b1) hot pressing, or b2) compacting at room temperature and subsequent sintering or hot pressing, wherein the sintering or hot pressing is carried out in an inert gas or vacuum at a temperature of at least 1400° C. The volume ratio SiC:Si in the powdered mixture is 95:5-99:1.

Abstract: Hollow bodies having a silicon-comprising shell, are produced by, in a gas comprising at least one silane of the general formula SinH2n+2?mXm with n=1 to 4, m=0 to 2n+2 and X=halogen, (a) generating a non-thermal plasma by an AC voltage of frequency f, or operating a light arc, or introducing electromagnetic energy in the infrared region into the gas, giving a resulting phase which (b) is dispersed in a wetting agent and distilled, and then (c) the distillate is contacted at least once with a mixture of at least two of the substances hydrofluoric acid, nitric acid, water, giving a solid residue comprising hollow bodies having a silicon-comprising shell after the conversion reaction of the distillate with the mixture has abated or ended.

Abstract: Hollow bodies having a silicon-comprising shell, are produced by, in a gas comprising at least one silane of the general formula SinH2n+2?mXm with n=1 to 4, m=0 to 2n+2 and X=halogen, (a) generating a non-thermal plasma by an AC voltage of frequency f, or operating a light arc, or introducing electromagnetic energy in the infrared region into the gas, giving a resulting phase which (b) is dispersed in a wetting agent and distilled, and then (c) the distillate is contacted at least once with a mixture of at least two of the substances hydrofluoric acid, nitric acid, water, giving a solid residue comprising hollow bodies having a silicon-comprising shell after the conversion reaction of the distillate with the mixture has abated or ended.

Abstract: The invention relates to the field of materials science and material physics and relates to a coated magnetic alloy material, which can be used, for example, as a magnetic cooling material for cooling purposes. The object of the present invention is to disclose a coated magnetic alloy material, which has improved mechanical and/or chemical properties. The object is attained with a magnetic alloy material with a NaZn13 type crystal structure and a composition according to the formula RaFe100-a-x-y-zTxMyLz and the surface of which is coated with a material composed of at least one element from the group Al, Si, C, Sn, Ti, V, Cd, Cr, Mn, W, Co, Ni, Cu, Zn, Pd, Ag, Pt, Au or combinations thereof The object is furthermore attained by a method in which the magnetic alloy material is coated by means of a method from the liquid phase.