Embodiments disclosed herein relate to using cobalt (Co) to fine tune the magnetic properties, such as permeability and magnetic loss, of nickel-zinc ferrites to improve the material performance in electronic applications. The method comprises replacing nickel (Ni) with sufficient Co.sup.+2 such that the relaxation peak associated with the Co.sup.+2 substitution and the relaxation peak associated with the nickel to zinc (Ni/Zn) ratio are into near coincidence. When the relaxation peaks overlap, the material permeability can be substantially maximized and magnetic loss substantially minimized. The resulting materials are useful and provide superior performance particularly for devices operating at the 13.56 MHz ISM band.

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 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.

This invention relates to safe immobilization and disposal of arsenic found in industrial waste streams and residues in the form of clean and compact well grown scorodite solids.

A gas-sensitive material, a preparation method therefore and an application thereof, and a gas sensor using the gas-sensitive material are provided. The gas-sensitive material is a carbon material-metal oxide composite nanomaterial formed by compounding a carbon material and metal oxides. The content of the carbon material is 0.520 wt. % and the content of the metal oxides is 8099.5 wt. %; the metal oxides contain tungsten oxide and one or more selected from tin oxide, iron oxide, titanium oxide, copper oxide, molybdenum oxide, and zinc oxide; the metal oxides are formed on the carbon material in the form of nanowires, and the nanowires are tungsten oxide-doped nanowires. The gas-sensitive material has reduced resistance, is capable of responding to various gases at a reduced working temperature.

A method for splitting carbon dioxide via a two-step metal oxide thermochemical cycle by heating a metal oxide compound selected from an iron oxide material of the general formula A.sub.xFe.sub.3-xO.sub.4, where 0x1 and A is a metal selected from Mg, Cu, Zn, Ni, Co, and Mn, or a ceria oxide compound of the general formula M.sub.aCe.sub.bO.sub.c, where 0<a<1, 0<b<1, and 0<c<2, where M is a metal selected from the group consisting of at least one of a rare earth metal and an alkaline earth metal, to a temperature greater than approximately 1400 C., thereby producing a first solid-gas mixture, adding carbon dioxide, and heating to a temperature less than approximately 1400 C, thereby producing carbon monoxide gas and the original metal oxide compound.

Materials, devices and methods related to below-resonance radio-frequency (RF) circulators and isolators. In some embodiments, a circulator can include a conductor having a plurality of signal ports, and one or more magnets configured to provide a magnetic field. The circulator can further include one or more ferrite disks implemented relative to the conductor and the one or more magnets so that an RF signal can be routed selectively among the signal ports due to the magnetic field. Each of the one or more ferrite disks can include synthetic garnet material having dodecahedral sites, octahedral sites and tetrahedral sites, with bismuth (Bi) occupying at least some of the dodecahedral sites, and aluminum (Al) occupying at least some of the tetrahedral sites. Such synthetic garnet material can be represented by a formula Y.sub.3-x-2yzBi.sub.xCa.sub.2y+zFe.sub.5-y-z-aV.sub.yZr.sub.zAl.sub.aO.sub.12. In some embodiments, x1.4, y0.7, z0.7, and a0.75.

A cathode for a battery includes a cathode material with the chemical formula Li.sub.1+Fe.sub.xCr.sub.yO.sub.2 where 01, and +x+y=2. In some variations, the cathode material has a disordered rock-salt crystal structure and the chemical formula Li.sub.1+Fe.sub.xCr.sub.yO.sub.2 where 01, and +x+y=2. And in at least one variations, a method of forming the cathode material includes wet ball milling solid precursors of lithium, iron, and chromium and forming a slurry, drying the slurry and forming a powder, sintering the powder, and dry ball milling the powder and forming the cathode material with the disordered rock-salt crystal structure and the chemical formula Li.sub.1+Fe.sub.xCr.sub.yO.sub.2 where 01, and +x+y=2.

Metal-hydroxide-organic framework compositions, methods of making metal-hydroxide-organic framework compositions and methods of using metal-hydroxide-organic framework compositions are described.

FeCo core-shell nanospheres and a method for producing the FeCo core-shell nanospheres are disclosed. Further disclosed is a method of reducing an organic contaminant in a solution by mixing the FeCo core-shell nanospheres with the solution. The FeCo core-shell nanosphere includes a shell made of a material having a formula Co.sub.xFe.sub.yO.sub.(x+1.5y) and a hollow core. The FeCo core-shell nanospheres are produced by mixing cobalt nitrate and iron nitrate in a solvent mixture to form a first mixture and mixing urea with the first mixture to form a second mixture. The solvent mixture is removed from the second mixture to form a powder. The powder is ground to form the FeCo core-shell nanospheres.