An antiballistic armor-plating component, includes a ceramic body made of a material including, as percentages by volume, between 20% and 75% of boron carbide, between 5% an d 30% of a metallic silicon phase or of a metallic phase including silicon and between 20% and 70% of silicon carbide and wherein, as percentages by volume: more than 60% of the grains with an equivalent diameter greater than 60 micrometers are boron carbide grains, the boron carbide grains with an equivalent diameter greater than 30 micrometers represent more than 20%, the silicon carbide grains with an equivalent diameter greater than or equal to 10 micrometers represent more than 10%, the silicon carbide grains with an equivalent diameter less than 10 micrometers represent more than 10%.

A polycrystalline dielectric solid body has a main phase of the general formula Ba.sub.0.995(Ti.sub.0.85Zr.sub.0.15)O.sub.3 and is co-doped with manganese and a rare earth element. The solid body can be used as a dielectric electrode in a method for treating tumors with alternating electric fields.

A sintered material exhibiting the following chemical composition, as percentages by weight: iron oxide(s), expressed in the Fe.sub.2O.sub.3 form, ≥85%, CaO: 0.1%-6%, SiO.sub.2: 0.1%-6%, 0.05% ≤TiO.sub.2, 0≤Al.sub.2O.sub.3, TiO.sub.2+Al.sub.2O.sub.3≤3%, and constituents other than iron oxides, CaO, SiO.sub.2, TiO.sub.2 and Al.sub.2O.sub.3: ≤5%. The CaO/SiO.sub.2 ratio by weight is between 0.2 and 7. The TiO.sub.2/CaO ratio by weight is between 0.2 and 1.5.

A multilayer electronic component includes a body including a plurality of dielectric layers, side margin portions disposed on the body, and external electrodes disposed on the body. The reliability of the multilayer electronic component is improved by controlling the contents of Si for each position of the dielectric layer and the side margin portion.

A sintered composite ceramic, including: a lithium-garnet major phase; and a grain growth inhibitor minor phase, such that the grain growth inhibitor minor phase has a metal oxide in a range of 0.1 wt. % to 10 wt. % based on the total weight of the sintered composite ceramic.

A zinc oxide powder for producing a zinc oxide sintered body is provided with which it is possible to obtain a zinc oxide sintered body that has a small sintered particle size and high strength. This zinc oxide powder for producing a zinc oxide sintered body is used for producing a zinc oxide sintered body, wherein the Al content represented in formula (I) is greater than or equal to 20 mol ppm and less than or equal to 2 mol %. (I){nAl/(n.sub.Zn+n.sub.Al)}×100. In formula (I), n.sub.Al represents the Al content in the zinc oxide powder, n.sub.Zn represents the Zn content in the zinc oxide powder, and the unit of n.sub.Zn and n.sub.Al is moles in both cases.

A zinc oxide powder for producing a zinc oxide sintered body is provided with which it is possible to obtain a zinc oxide sintered body that has a large sintered particle size and excellent conductivity. This zinc oxide powder for producing a zinc oxide sintered body is used for producing a zinc oxide sintered body, wherein the Ga content represented in formula (I) is greater than or equal to 30 mol ppm and less than 3 mol %. (I) {n.sub.Ga/(n.sub.Zn+n.sub.Ga)}×100 In formula (I), n.sub.Ga represents the Ga content in the zinc oxide powder, n.sub.Zn represents the Zn content in the zinc oxide powder, and the unit of n.sub.Zn and n.sub.Ga is moles in both cases.

The invention relates to a copper-ceramic composite comprising:—a ceramic substrate;—a copper or copper alloy coating in which the copper or copper alloy has grain sizes of 10 μm to 300 μm and a number distribution of the grain sizes with a median d.sub.50 and an arithmetic mean d.sub.arith, the ratio of d.sub.50 to d.sub.arith (d.sub.50/d.sub.arith) being between 0.75 and 1.10.

The sliding member according to the embodiment includes a silicon nitride sintered body that includes silicon nitride crystal grains and a grain boundary phase, in which a percentage of a number of the silicon nitride crystal grains including dislocation defect portions inside the silicon nitride crystal grains among any 50 of the silicon nitride crystal grains having completely visible contours in a 50 μm×50 μm observation region of any cross section or surface of the silicon nitride sintered body is not less than 0% and not more than 10%. The percentage is more preferably not less than 0% and not more than 3%.

The invention relates to a copper/ceramic composite comprising—a ceramic substrate which contains aluminum oxide, —a coating which lies on the ceramic substrate and which is made of copper or a copper alloy, wherein the copper or the copper alloy has a particle size number distribution with a median value d.sub.50, an arithmetic mean value d.sub.arith, and a symmetry value S(Cu)=d.sub.50/d.sub.arith; the aluminum oxide has a particle size number distribution with a median value d.sub.50, an arithmetic mean value d.sub.arith, and a symmetry value S(Al.sub.2O.sub.3)=d.sub.50/d.sub.arith; and S(Al.sub.2O.sub.3) and S(Cu) satisfy the following condition: 0.7≤S(Al.sub.2O.sub.3)/S(Cu)≤1.4.