A multilayer body includes a multilayer structure including a glass ceramic layer including a glass and a filler and a ferrite layer including a ferrite, in which the glass ceramic layer has a glass content of about 30.0% or more by weight and about 80.0% or less by weight and a filler content of about 20.0% or more by weight and about 70.0% or less by weight, the glass included in the glass ceramic layer includes about 0.5% or more by weight and about 5.0% or less by weight R.sub.2O (R represents at least one selected from the group consisting of Li, Na, and K), about 0% or more by weight and about 5.0% or less by weight Al.sub.2O.sub.3, about 10.0% or more by weight and about 25.0% or less by weight B.sub.2O.sub.3, and about 70.0% or more by weight and about 85.0% or less by weight SiO.sub.2 based on the total weight of the glass, and the filler included in the glass ceramic layer includes at least one of SiO.sub.2 and Al.sub.2O.sub.3 and also includes about 5.0% or more by weight and about 15.0% or less by weight of a ferrite based on the total weight of the glass and the filler.

An oxide ceramic represented by the general formula [Sr.sub.2xBa.sub.xCo.sub.2y(Zn.sub.uNi.sub.1u).sub.yFe.sub.12zAl.sub.zO.sub.22]. In the formula, 0.7x1.3 and 0.8z1.2. y is 0y0.8 when 0.5u1.0 and is 0y1.6 when 0u0.5. y is preferably 0.4 or less. Further, a variable inductor as a ceramic electronic component has a component base body formed from the oxide ceramic.

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.

The invention relates to an electrode material, preferably an inert anode material comprising at least a metal core and a cermet material, characterized in that: said metal core contains at least one nickel (Ni) and iron (Fe) alloy, said cermet material comprises at least as percentages by weight: 45 to 80% of a nickel ferrite oxide phase (2) of composition Ni.sub.xFe.sub.yM.sub.zO.sub.4 with 0.60 x0.90; 1.90y2.40; 0.00z0.20 and M being a metal selected from aluminum (Al), cobalt (Co), chromium (Cr), manganese (Mn), titanium (Ti), zirconium (Zr), tin (Sn), vanadium (V), niobium (Nb), tantalum (Ta) and hafnium (Hf) or being a combination of these metals, 15 to 45% of a metallic phase (1) comprising at least one alloy of nickel and copper.

The present invention relates to a ferrite sintered plate having a composition comprising 47 to 50 mol % of Fe.sub.2O.sub.3, 7 to 26 mol % of NiO, 13 to 36 mol % of ZnO, 7 to 12 mol % of CuO and 0 to 1.5 mol % of CoO, as calculated in terms of the respective oxides, in which the ferrite sintered plate has a volume resistivity of 110.sup.8 to 110.sup.12.Math.cm and a thickness of 10 to 60 m; and a ferrite sintered sheet comprising the ferrite sintered plate on a surface of which a groove or grooves are formed, and an adhesive layer and/or a protective layer formed on the ferrite sintered plate, in which the ferrite sintered sheet has a magnetic permeability at 500 kHz a real part of which is 120 to 800 and an imaginary part of which is 0 to 30, and a product (m) of the real part of the magnetic permeability at 500 kHz of the ferrite sintered sheet and a thickness of the ferrite sintered plate is 5000 to 48000. The ferrite sintered plate and the ferrite sintered sheet according to the present invention have a high volume resistivity as well as a large value and a small value of a magnetic permeability thereof, and therefore can be suitably used as a shielding plate in a digitizer system.

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 method of preparing a nickel ferrite-based eutectic ceramic inert anode material, in which a mixture powder of NiFe.sub.2O.sub.4-based spinel powder and nickel oxide-based powder is mixed with a binder, and granulated to obtain a granular material; the granular material is subjected to compression molding under 100-200 MPa to obtain a green body, which is pre-sintered to obtain a pre-sintered body; the pre-sintered body is melted in an inert gas atmosphere to obtain a molten material; the molten material is cooled at a rate of 1-100 C./min and solidified to obtain a ceramic solidified body; and the ceramic solidified body is processed at 1250-1400 C. for 2-6 h, and cooled to room temperature at a rate of 1-50 C./min to obtain the nickel ferrate-based eutectic ceramic inert anode material.

An iron titanium oxide (Fe.sub.2TiO.sub.5)/iron oxide (Fe.sub.1.766O.sub.3)/titanium oxide (TiO.sub.2)/cobalt iron oxide (CoFe.sub.2O.sub.4)/carbon (C) nanocomposite material includes orthorhombic Fe.sub.2TiO.sub.5 phases, rhombohedral Fe.sub.1.766O.sub.3 phases, tetragonal TiO.sub.2 phases and cubic CoFe.sub.2O.sub.4 phases where the Fe.sub.2TiO.sub.5/Fe.sub.1.766O.sub.3/TiO.sub.2/CoFe.sub.2O4/C nanocomposite material has a granular morphology including spherical particles having an average particle diameter in a range from 40 to 80 nanometer (nm).

A composition and a solid material is especially suitable for the manufacture of an antenna adapted to operate in the very high frequency and ultra high frequency or V/UHF band. The composition has the formula Ni.sub.aZn.sub.bCu.sub.cCo.sub.dFe.sub.2O.sub.4, in which 2(a+b+c+d)+3(2)=8, 0.05<b<0.5, e.g. 0.1<b<0.5, e.g. 0.1<b<0.4, e.g. 0.15<b<0.35, 0.10<c<0.25, preferably 0.15<c<0.25, alternatively c is 0.20, 0.04<d<0.25, preferably 0.06<d<0.25, and more preferably 0.07<d<0.25, and <0.05.

A method for manufacturing a sintered body, the method including heating a mixture that contains a plurality of particles of a metal oxide having a spinel-type structure, and a metal acetylacetonate under pressure at a temperature of from a melting point or higher of the metal acetylacetonate to 600 C. or lower, to form a sintered body that contains the metal oxide having the spinel-type structure.