Provided is a solid electrolyte material comprising Li, Y, Br, and Cl. In an X-ray diffraction pattern in which CuK is used as a radiation source, peaks are present within all ranges of diffraction angles 2 of 13.6 to 14.4, 27.4 to 28.5, 31.8 to 32.9, 45.4 to 47.5, 54.0 to 56.1, and 56.6 to 59.0.

Provided is a solid electrolyte material comprising Li, Y, Br, and Cl wherein in an X-ray diffraction pattern in which Cu-K is used as a radiation source, peaks are present within all ranges of diffraction angles 2 of 15.1 to 15.8, 27.3 to 29.5, 30.1 to 31.1, 32.0 to 33.7, 39.0 to 40.6, and 47.0 to 48.5.

Provided is a solid electrolyte material comprising Li, Y, Br, and I, wherein in an X-ray diffraction pattern in which Cu-K is used as a radiation source, peaks are present within all ranges of diffraction angles 2 of 12.5 to 14.0, 25.0 to 27.8, 29.2 to 32.3, 41.9 to 46.2, 49.5 to 54.7, and 51.9 to 57.5.

Provided is a solid electrolyte material represented by the following composition formula (1):

Li.sub.3YX.sub.6Formula (1) where X is two or more kinds of elements selected from the group consisting of Cl, Br, and I.

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 SiH.sub.4, Si.sub.2H.sub.6 and Si.sub.3H.sub.8, 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.

A method of manufacturing hexagonal boron nitride fibers includes: providing amorphous fibrous boron nitride; performing heat treatment on the amorphous fibrous boron nitride at a first temperature of 500 C. or greater and less than 900 C. in an oxygen-containing atmosphere to obtain a first heat-treated product; and performing heat treatment on the first heat-treated product at a second temperature in a range of 1000 C. to 1800 C. in a nitrogen-containing atmosphere to obtain a second heat-treated product containing hexagonal boron nitride.

An oxide-based semiconductor compound including metal cations and oxygen, wherein hydride ions H.sup. originally bonded with the metal cations have been replaced with fluorine ions F.sup. and at least one of the fluorine ions F.sup. is bonded with one to three of the metal cations.

It is provided a process of producing amorphous silica from a raw material, such as serpentine, containing silica comprising the steps of mixing the raw material with a hydrochloric acid solution; leaching the raw material obtaining a slurry comprising a liquid fraction and a solid fraction containing silica and minerals; separating the liquid fraction and the solid fraction; removing the minerals from the solid fraction by magnetic separation producing a purified solid silica; drying the purified solid silica; and heating the purified solid silica to remove hydroxyl groups from the silica surface and reducing specific surface area of the resulting amorphous silica.

The present invention relates to a process for preparing amorphous calcium carbonate, the amorphous calcium carbonate obtainable by the process, its use as well as a product comprising the amorphous calcium carbonate and the use of a spray dryer for the preparation of amorphous calcium carbonate.

A positive electrode active material for obtaining a lithium ion secondary battery, wherein capacity, electron conductivity, durability, and heat stability at the time of overcharge are improved, durability and heat stability being achieved at a high level, and including: a lithium nickel manganese composite oxide composed of secondary particles, in which a plurality of primary particles are flocculated, wherein the composite oxide is represented by a general formula (1): Li.sub.dNi.sub.1-a-b-cMn.sub.aM.sub.bTi.sub.cO.sub.2 (wherein, M is at least one kind of element selected from Co, W, Mo, V, Mg, Ca, Al, Cr, Zr and Ta, 0.05a0.60, 0b0.60, 0.02c0.08, 0.95d1.20), at least a part of titanium in the composite oxide is solid-solved in the primary particles, and, a lithium titanium compound exists on a surface of the positive electrode active material for the lithium ion secondary battery.