A multiphase ferrite composition includes a primary phase consisting of a MnZn ferrite matrix; and 0.01 to 10 weight percent microscaled inclusion particles comprising an orthoferrite RFeO3 wherein R is a rare earth ion, yttrium iron garnet (YIG), or a combination thereof, wherein the microscaled inclusion particles have an average particle size (D50) of 0.1 micron to 5 microns, and wherein the D50 of the microscaled inclusion particles is smaller than the average particle size (D50) of the MnZn ferrite particles; and optionally 0.01 to 5 weight percent additive; wherein weight percent is based on the total weight of the multiphase ferrite composition. A method of manufacturing the multiphase ferrite composition is also disclosed.

The disclosed technology generally relates dielectric materials, and more particularly to a combination of co-fireable dielectric materials that can be attached to each other without the use of adhesives. In an aspect, a composite article comprises a magnetic portion comprising a nickel zinc ferrite. The composite article additionally comprises a non-magnetic portion contacting the magnetic portion, the non-magnetic portion comprising a spinel-structured oxide comprising Mg.sub.2-xAl.sub.2xTi.sub.1-xO.sub.4 and having a dielectric constant between about 7 and 14, wherein 0<x1.

An MnZn-based ferrite includes, as major components, 50 mol % to 53 mol % Fe.sub.2O.sub.3, 8 mol % to 10 mol % ZnO, and 37 mol % to 42 mol % MnO on an oxide basis. The MnZn-based ferrite includes, as minor components, less than or equal to 120 ppm SiO.sub.2, 100 ppm to 500 ppm Nb.sub.2O.sub.5, 0 ppm to 200 ppm ZrO.sub.2, 2000 ppm to 4000 ppm Co.sub.3O.sub.4, and 0 ppm to 1500 ppm SnO.sub.2 on an oxide basis.

The disclosed technology generally relates dielectric materials and methods of forming the same, and more particularly to a combination of co-fireable dielectric materials that can be attached to each other without the use of adhesives. In an aspect, a composite article comprises a magnetic portion comprising a nickel zinc ferrite. The composite article additionally comprises a non-magnetic portion contacting the magnetic portion, the non-magnetic portion comprising a spinel-structured oxide comprising Mg.sub.2-xAl.sub.2xTi.sub.1-xO.sub.4 and having a dielectric constant between about 7 and 14, wherein 0<x?1.

The MnZn ferrite material includes principal components and auxiliary components, where the principal components include: 52.5 mol % to 53.8 mol % of Fe.sub.2O.sub.3, 8.8 mol % to 12 mol % of ZnO, and the balance of MnO; the auxiliary components include: 0.35 wt % to 0.5 wt % of Co.sub.2O.sub.3, 0.03 wt % to 0.08 wt % of CaSiO.sub.3, 0.01 wt % to 0.04 wt % of Nb.sub.2O.sub.5, and 0.05 wt % to 0.12 wt % of TiO.sub.2 and RE elemental components; the RE elemental components include one or more from the group consisting of 0 wt % to 0.04 wt % of Gd.sub.2O.sub.3, 0 wt % to 0.02 wt % of Ho.sub.2O.sub.3, and 0 wt % to 0.03 wt % of Ce.sub.2O.sub.3; the auxiliary components are all represented by a mass percentage relative to a total mass of the Fe.sub.2O.sub.3, the MnO, and the ZnO.

Disclosed is a method of manufacturing a ferrite magnetic substance, including: a first mixing operation of providing a first mixture composed of 47 to 49 wt % of Fe, 16 to 18 wt % of Mn, 5.2 to 7.2 wt % of Zn, and a remainder of oxygen and other inevitable impurities, a second mixing operation of providing a second mixture composed of the first mixture and an additive including, based on 100 parts by weight of the first mixture, 28 to 51 ppm of Si, 140 to 210 ppm of Nb and 155 to 185 ppm of Zr, and a finish operation of producing a ferrite magnetic substance by sintering the second mixture.

The embodiments of the present invention disclose a method for synthesizing ceramic composite powder and ceramic composite powder, pertaining to the technical field of inorganic non-metallic materials. Among them, the method includes preparing an aqueous slurry of ceramic raw materials, the aqueous slurry including ceramic raw material, water and low polymerization degree organometallic copolymer, the ceramic raw material including at least two components; adding a crosslinking coagulant into the aqueous slurry to obtain a gel; dehydrating and drying the gel to obtain the dried gel; heating the dried gel to the synthesizing temperature of the ceramic composite powder and conducting the heat preservation to obtain ceramic composite powder or ceramic composite base powder; conducting secondary doping on ceramic composite base powder to obtain the ceramic composite powder. The multi-component ceramic composite powder prepared by the embodiments of the present invention has uniformly dispersed each component and low synthesizing temperature.

Ferrite powder of the present invention is ferrite powder detectable with a metal detector, comprising: soft ferrite particles containing Mn of 3.5 mass % or more and 20.0 mass % or less and Fe of 50.0 mass % or more and 70.0 mass % or less. It is preferable that a volume average particle diameter of the particles constituting the ferrite powder is 0.1 m or more and 100 m or less. It is preferable that magnetization by a VSM measurement when magnetic field of 5 K.Math.1000/4A/m is applied is 85 A.Math.m.sup.2/kg or more and 98 A.Math.m.sup.2/kg or less.

A composite magnetic material has a plurality of grains having a magnetic ferrite phase, grain boundaries surrounding the grains, and a plurality of nanoparticles disposed at the grain boundaries. The nanoparticles of the composite material are both magnetic and electrically insulating, having a magnetic flux density of greater than about 100 mT and an electrical resistivity of at least about 10.sup.8 Ohm-cm. Also provided is a method of making the composite material. The material is useful for making inductor cores of electronic devices.

A method for producing a MnZn ferrite core used at a frequency of 1 MHz or more and an exciting magnetic flux density of 75 mT or less, the MnZn ferrite comprising 53-56% by mol of Fe (calculated as Fe.sub.2O.sub.3), and 3-9% by mol of Zn (calculated as ZnO), the balance being Mn (calculated as MnO), as main components, and 0.05-0.4 parts by mass of Co (calculated as Co.sub.3O.sub.4) as a sub-component, per 100 parts by mass in total of the main components (calculated as the oxides); comprising a step of molding a raw material powder for the MnZn ferrite to obtain a green body; a step of sintering the green body and cooling it to a temperature of lower than 150 C. to obtain a sintered body of MnZn ferrite; and a step of conducting a heat treatment comprising heating the sintered body of MnZn ferrite to a temperature meeting Condition 1 of 200 C. or higher, and Condition 2 of (Tc90) C. to (Tc+100) C., wherein Tc is a Curie temperature ( C.) calculated from the percentages by mol of Fe.sub.2O.sub.3 and ZnO contained in the main components of the MnZn ferrite, keeping the sintered body at the above temperature for a predetermined period of time, and then cooling the sintered body from the keeping temperature at a speed of 50 C./hour or less.