Disclosed are a composite material and a method for preparing the same. The composite material is consisted of TiO.sub.2 and BaZn.sub.1.2Co.sub.0.8Fe.sub.16O.sub.27. The composite material of the invention has the advantages of high absorption frequency band, good compatibility and wide frequency band, and it is applicable for the shell protection material of a mobile phone or a TV set, thereby absorbing the electromagnetic wave band that is the most harmful to human bodies, without influencing the normal communication function of an electronic device, for example, a mobile phone.

A Co.sub.2Z hexaferrite composition is provided containing molybdenum and one or both of barium and strontium, having the formula (Ba.sub.2Sr.sub.(3-Z)Co.sub.(2+X))Mo.sub.xFe.sub.(y-2x)O.sub.41 where x=0.01 to 0.20; y=20 to 24; and z=0 to 3. The composition can exhibit high permeabilities and equal or substantially equal values of permeability and permittivity while retaining low magnetic and dielectric loss tangents and loss factors. The composition is suitable for high frequency applications such as ultrahigh frequency and microwave antennas and other devices.

The present application discloses a preparation method for a low-line-width W-type hexagonal crystal system microwave ferrite material. The preparation method comprises: performing weighing, first ball milling treatment, drying, first sintering treatment, second ball milling treatment, granulation and molding, and second sintering treatment in sequence to obtain a low-line-width W-type hexagonal crystal system microwave ferrite material. According to the preparation method of the present application, a rare earth element Gd is employed to replace some Fe ions, appropriate saturation magnetization, remanence ratio and line width are obtained by using electromagnetic properties of Gd and Fe and compensation points, and the microstructure of the W-type hexagonal crystal system microwave ferrite material is improved by jointly adding appropriate quantities of low-melting-point fluxing agents Bi.sub.2O.sub.3, V.sub.2O.sub.5, SiO.sub.2 and ZnO, so that pores are reduced, the line width is decreased and the remanence ratio is increased. The preparation method has good process stability and good repeatability, and is suitable for mass production.

Disclosed are a microwave ferrite material suitable for a 5G radio frequency device and a preparation method therefor. The preparation raw materials of the microwave ferrite material comprise a first microwave ferrite material and a second microwave ferrite material. In the microwave ferrite material provided by the present application, a double-component formula is introduced, proper ion substitution is employed, and ball milling and sintering processes are controlled, and therefore, the prepared microwave ferrite material has the characteristics of high saturation magnetic moment, high Curie temperature, narrow linewidth and low loss, and can be applied to industrial large-scale production of 5G radio frequency devices.

Provided is a ferrite sintered magnet including a ferrite phase having a magnetoplumbite-type crystal structure. x, y, and m satisfy the following Equations (1), (2), and (3) when composition of the ferrite sintered magnet is represented by R.sub.1-xA.sub.xFe.sub.m-yCo.sub.y, where R denotes at least one kind of element selected from rare earth elements including Y and A denotes Ca or Ca and elements including at least one kind selected from Sr or Ba. The content of B in the ferrite sintered magnet is from 0.1% to 0.6% by mass in terms of B.sub.2O.sub.3.
0.2x0.8(1)
0.1y0.65(2)
3m14(3)

A ferrite composition is provided containing Ba, Co, and Ir and having a Z-type hexaferrite phase and a Y-type hexaferrite phase. The ferrite composition has the formula Ba.sub.3Co.sub.(2-x)Ir.sub.xFe.sub.(24-2x)O.sub.41 where x=0.05-0.20. The composition has equal or substantially equal values of permeability and permittivity while retaining low magnetic and dielectric loss factors. The composition is suitable for ultrahigh frequency applications such as high frequency and microwave antennas.

A ferrite sintered magnet includes a composition expressed by a formula (1) of Ca.sub.1-w-xLa.sub.wA.sub.xFe.sub.zCo.sub.mO.sub.19. In the formula (1), w, x, z, and m satisfy a formula (2) of 0.30w0.50, a formula (3) of 0.08x0.20, a formula (4) of 8.55z10.00, and a formula (5) of 0.20m0.40. In the formula (1), A is at least one kind of element selected from a group consisting of Sr and Ba. Cr is further contained at 0.058 mass % to 0.132 mass % in terms of Cr.sub.2O.sub.3.

A ferrite sintered magnet includes a composition expressed by a formula (1) of Ca.sub.1-w-xLa.sub.wA.sub.xFe.sub.zCo.sub.mMn.sub.aO.sub.19. In the formula (1), w, x, z, m, and a satisfy a formula (2) of 0.21w0.62, a formula (3) of 0.02x0.46, a formula (4) of 7.43z11.03, a formula (5) of 0.18m0.41, and a formula (6) of 0.046a0.188. In the formula (1), A is at least one kind of element selected from a group consisting of Sr and Ba.

A hexagonal ferrite material includes a Y phase hexagonal ferrite material having the composition Sr.sub.2Co.sub.2Fe.sub.12O.sub.22 or Sr.sub.2-xNa.sub.xCo.sub.2-xSc.sub.xFe.sub.12O.sub.22, 0<x<2, doped with a trivalent element, a tetravalent element, and/or a transition metal.

An electromagnetic effect material includes as a primary component, a polycrystalline oxide ceramic containing at least Sr, Co, and Fe. In the polycrystalline oxide ceramic, the crystal c-axis is oriented in a predetermined direction, and the degree of orientation of the c-axis is 0.2 or more by a Lotgering method. A component substrate is formed of this electromagnetic effect material.