According to one embodiment, an active material is provided. The active material includes orthorhombic system oxide represented by the following formula: Li.sub.xM1M2.sub.2O.sub.6. In this formula, 0x5, M1 is at least one selected from the group consisting of Fe and Mn, and M2 is at least one selected from the group consisting of Nb, Ta and V.

The powder of the magnetoplumbite-type hexagonal ferrite is an aggregate of particles of a compound represented by Formula (1), and, in a particle size distribution based on number measured by a laser diffraction scattering method, in a case where a mode value is defined as a mode diameter, a diameter at a cumulative percentage of 10% is defined as D10 and a diameter at a cumulative percentage of 90% is defined as D90, the mode diameter is equal to or greater than 5 m and less than 10 m and an expression of (D90D10)/mode diameter3.0 is satisfied. In Formula (1), A represents at least one metal element selected from the group consisting of Sr, Ba, Ca, and Pb, and x satisfies 1.5x8.0.
AFe.sub.(12-x)Al.sub.xO.sub.19Formula(1)

The present invention relates to a ferrite particle, containing a crystal phase component containing a perovskite crystal represented by the compositional formula: RZrO.sub.3 (provided that R represents an alkaline earth metal element), and having an apparent density in a range represented by the following formula:
1.90Y2.45
provided that Y in the formula is the apparent density (g/cm.sup.3) of the ferrite particle.

A composition includes a compound of the formula A.sub.xM.sub.yO.sub.z, wherein A is an A-site element and includes Ba, Ca, Cu, Dy, Er, Gd, La, Nd, Pr, Sm, Sr, Y, or Yb, or a combination thereof, M is an M-site element and includes Co, Cu, Fe, Mn, Ni, Ti, Sc, or P, or a combination thereof, and 0<x1, 0<y2, (3)z(4), and 1<<1. Use of the composition as a catalyst composition, for example an oxygen reduction reaction catalyst composition, in gas diffusion electrodes, and in metal-air batteries is also described.

Provided is a ferrite particle powder for electromagnetic wave absorption that can maintain flexibility and uniformity of physical properties of a sheet even when the sheet is highly filled with the ferrite particle powder and is excellent in electromagnetic wave absorbing performance in a GHz band. The ferrite particle powder is a ferrite particle powder for electromagnetic wave absorption, the ferrite particle powder containing magnetoplumbite-type ferrite represented by a chemical formula of A.sub.xFe.sub.(12-y)(Ti.sub.zMn.sub.(1-z)).sub.yO.sub.19, where A is at least one selected from Ba, Sr, Ca, and Pb, x is 0.9 to 1.1, y is 5.0 or less, and z is 0.35 to 0.65, and the ferrite particle powder having: a compressed density of 3.00 g/cm.sup.3 or more; and an average particle diameter of 0.50 to 3.0 m determined by an air permeability method (Blaine method).

A layered oxide material having a composition represented by Chemical Formula (1):

A.sub.wM.sup.j.sub.xM.sup.i.sub.yO.sub.2(1)

wherein A is sodium or is a mixed alkali metal including sodium as a major constituent; w>0; M.sup.j is a transition metal not including Ni or is a mixture of transition metals not including Ni; x>0; j1; M.sup.i includes either one or more alkali metals, one or more alkaline earth metals, or a mixture of one or more alkali metals and one or more alkaline earth metals; y>0; i1; and (M.sup.j+M.sup.i)3. A method of forming the layered oxide material includes the steps of mixing one or more precursors in a solvent to form a mixture; heating the mixture to form a reaction product; and cooling the reaction product under air or inert atmosphere.

A manganese iron oxide and a preparation method thereof, and a preparation method for lithium manganese iron phosphate cathode materials are provided. The preparation method for the manganese iron oxide includes the following steps: Configuring a mixed salt solution containing the first complexing agent, antioxidant, manganese salt, and iron salt; mixing the mixed salt solution, the second complexing agent, oxidant and deionized water to undergo a complexation-oxidation-precipitation reaction, filtering, washing, and drying a precipitate obtained after the reaction to obtain a manganese iron oxide. The preparation methods for the manganese iron oxide and lithium manganese iron phosphate cathode materials are simple, the physical and chemical indexes of the product are controllable, the raw materials are easy to obtain, the cost is low, the reaction conditions are mild, the corrosion resistance requirements of the equipment are not high, the technical difficulty is low, and it is easy to scale production.

A manganese iron oxide and a preparation method thereof, and a preparation method for lithium manganese iron phosphate cathode materials are provided. The preparation method for the manganese iron oxide includes the following steps: Configuring a mixed salt solution containing the first complexing agent, antioxidant, manganese salt, and iron salt; mixing the mixed salt solution, the second complexing agent, oxidant and deionized water to undergo a complexation-oxidation-precipitation reaction, filtering, washing, and drying a precipitate obtained after the reaction to obtain a manganese iron oxide. The preparation methods for the manganese iron oxide and lithium manganese iron phosphate cathode materials are simple, the physical and chemical indexes of the product are controllable, the raw materials are easy to obtain, the cost is low, the reaction conditions are mild, the corrosion resistance requirements of the equipment are not high, the technical difficulty is low, and it is easy to scale production.

A preparation method for manganese-zinc-iron-based cathode material for a sodium-ion battery by recycling spent zinc-manganese battery is provided. A general formula of the manganese-zinc-iron-based cathode material for sodium-ion battery is Na.sub.nMn.sub.1-x-yZn.sub.xFe.sub.yO.sub.2, 0.3<n1.0, 0.01<x0.5, and 0.01<y0.5. In the preparation method, after the manganese-zinc-iron material of spent zinc-manganese battery is leached out by a solution leaching method, the impurity is removed by a displacement method, and the appropriate material is added according to the composition ratio of manganese-zinc-iron-based cathode material for sodium ion battery to prepare the manganese-zinc-iron-based cathode material product for sodium ion battery. The sodium ion cathode material has excellent electrochemical performance and high-added value of the product, and avoids the problem of high energy consumption and low separation purity caused by the separation of manganese-zinc-iron in the recycling process of spent zinc-manganese battery.

A method for preparing an infrared radiation ceramic material includes mixing and ball milling raw materials of Fe.sub.2O.sub.3, MnO.sub.2 and CuO in a mass ratio to obtain a mixed powder; pressing the mixed powder; adjusting laser spot, laser power and laser sintering time of a laser; irradiating or sintering by a first laser the pressed mixed powder in a crucible for a high-temperature solid-phase reaction to obtain an AB.sub.2O.sub.4 type ferrite powder; obtaining a first mixture by mixing the AB.sub.2O.sub.4 type ferrite powder and a cordierite powder in a mass ratio; adding a sintering aid and a nucleating agent for ball milling; obtaining a second mixture by mixing the first mixture and a binder for aging; pressing the second mixture; and irradiating or sintering the pressed second mixture by a second laser to obtain the infrared radiation ceramic material.