This disclosure relates to porous carbon and a method of preparing the same. The porous carbon of the present invention is derived from a carbide compound having a composition comprising metal and oxide. The porous carbon of the present invention comprises both micropores and mesopores, and has large specific surface area, and thus, may be usefully used in various fields.

A process for synthesizing a Mn.sup.4+ doped phosphor of formula I by electrolysis is presented. The process includes electrolyzing a reaction solution comprising a source of manganese, a source of M and a source of A. One aspect relates to a phosphor composition produced by the process. A lighting apparatus including the phosphor composition is also provided. A.sub.x[MF.sub.y]:Mn.sup.4+ (I) where, A is Li, Na, K, Rb, Cs, or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; x is the absolute value of the charge of the [MF.sub.y] ion; and y is 5, 6 or 7.

The invention provides a Potassium Fluotitanate (K.sub.2TIF6) manufacture process. The Potassium Fluotitanate (K.sub.2TIF6) manufacture process includes steps: A. providing titanium ferrum powder to a reaction furnace and adding HF and peroxide solution to react with the titanium ferrum powder sufficiently to manufacture H.sub.2TiF.sub.6, B. filtrating the sufficiently mixed solution of step A and adding it to another reaction furnace, and then after the H.sub.2TiF.sub.6 cools off, adding Potassium Chloride (KCl) solution to react with the mixed solution to manufacture Potassium Fluotitanate (K.sub.2TiF.sub.6); C. adding K.sub.2CO.sub.3 solution to the remaining solution of step B and react with the remaining solution and controlling the pH value, the element Fe is recycled by a form of Fe(OH).sub.3 flocculent precipitate and the Potassium Chloride (KCl) and KF solution are recycled. This invention has these advantages: adding peroxide to the titanium ferrum powder can oxidize Fe.sup.2+ into Fe.sup.3+ and adding K.sub.2CO.sub.3 solution to clean element Fe out by a form of Fe(OH).sub.3 flocculent precipitate, and the hydrofluoric acid (HF) can be recycled which can realize the HF zero polluting discharge.

A halide material producing method according to the present disclosure includes (A) subjecting a material mixture containing a first compound containing Li, M1, and X1 and a second compound containing M2 to mechanochemical treatment, wherein each of M1 and M2 represents one type of element selected from a metal element and a metalloid element, and X1 represents at least one selected from the group consisting of F, Cl, Br, and I.

A process for producing a lithium titanium phosphate based solid electrolyte material is disclosed, the process comprising the steps of: (i) providing a solution comprising a Li source material, a Ti source material, a P source material and optionally a Si source material and/or a source material of a metal M, wherein M is selected from the group of Al, Ga, Ge, In, Sc, V, Cr, Mn, Co, Fe, Y, the lanthanides or a combination thereof; (ii) generating an aerosol from the solution; (iii) subjecting the generated aerosol to flame pyrolysis to form a particulate precursor material therefrom; and (iv) subjecting the particulate precursor material to field-assisted sintering to form the lithium titanium phosphate based solid electrolyte material. Furthermore, disclosed are a solid electrolyte material obtainable through said production process and articles comprising the same.

The present invention relates to a method for producing a hexafluoromanganate(IV), said method being characterized by comprising: inserting an anode and a cathode into a reaction solution that contains a compound containing manganese having an atomic valence of less than 4 and/or manganese having an atomic valence of more than 4 and hydrogen fluoride; and then applying an electric current having an electric current density of 100 to 1000 A/m.sup.2 between the anode and the cathode. According to the present invention, it becomes possible to produce a hexafluoromanganate(IV) in which the content ratio of manganese having an atomic valence of 4 is high and the contamination with oxygen is reduced and which has high purity. When a complex fluoride red phosphor is produced using the hexafluoromanganate(IV) as a raw material, the phosphor produced has high luminescence properties, particularly high internal quantum efficiency.

A positive electrode material includes: a positive electrode active material; a coating layer covering at least part of the surface of the positive electrode active material; and a second solid electrolyte. The coating layer includes a first solid electrolyte. The first solid electrolyte includes Li, M1 and F. M1 is at least one selected from the group consisting of Ti, Al and Zr. The second solid electrolyte includes Li, M2, O and X. M2 is at least one selected from the group consisting of Ta and Nb. X is at least one selected from the group consisting of F, Cl, Br and I.

A coated active material of the present disclosure includes: an active material; and a coating layer including a first solid electrolyte and coating at least a portion of a surface of the active material, wherein the first solid electrolyte includes a fluoride including Ti, and a proportion of a sum of a TiOF bond and a TiO bond in a group of bonds to Ti included in the first solid electrolyte is greater than 70%.

Disclosed is a process for producing a fluorine-containing complex salt, characterized by that, on a reaction mother liquor containing a plurality of cation species and a fluoroanion in a state that they have been dissolved in a solvent, a trigger for accelerating decomposition of the fluoroanion is allowed to act, thereby precipitating a complex salt containing a plurality of cation species and fluorine, as a solid, from the reaction mother liquor. According to this process, it is possible to produce a monodispersed fluorine-containing complex salt with uniform particle size and shape.

Provided is a method for producing a phosphor having a s chemical composition represented by formula (I), A.sub.2MF.sub.6:Mn (I) (A is one type or more of an alkali metal selected from Li, Na, K, Rb, and Cs, and includes at least Na and/or K, and M is one type or more of a tetravalent element selected from Si, Ti, Zr, Hf, Ge, and Sn.), the method comprising preparing a first hydrofluoric acid solution containing M and a second hydrofluoric acid solution containing A as well as either dissolving a compound containing Mn in either the first hydrofluoric acid solution or the second hydrofluoric acid solution or preparing a separate solution in which the compound containing Mn is dissolved. When the solutions are mixed to precipitate the phosphor of the formula (I), the solutions are mixed so that the concentration of M is 0.1 to 0.5 mol/liter when all the solutions are mixed. According to the present invention, a complex fluoride phosphor having excellent luminescence properties can be produced stably with high yield.