A dielectric composition is provided. The dielectric composition includes a tungsten bronze type complex oxide expressed by a chemical formula (K.sub.1-xNa.sub.x)Sr.sub.2Nb.sub.5O.sub.15 as a main component, x satisfying 0x0.50, wherein the dielectric composition includes a secondary phase of at least one or more selected from: MgO.SiO.sub.2; BaO.2MgO.2SiO.sub.2; and 2MgO.B.sub.2O.sub.3; or the dielectric composition includes a tungsten bronze type complex oxide expressed by a chemical formula (K.sub.1-xNa.sub.x)Sr.sub.2Nb.sub.5O.sub.15 as a main component, x satisfying 0x0.40, wherein the dielectric composition includes: MgO; BaO; B.sub.2O.sub.3; SiO.sub.2; and P.sub.2O.sub.5 as a first accessory component in a total content of 2.5 mol to 20.0 mol per 100 mol of the main component.

LTCC devices are produced from dielectric compositions comprising a mixture of precursor materials that, upon firing, forms a dielectric material comprising a barium-tungsten-silicon host.

A composite dielectric ceramic material having anti-reduction and high temperature stability characteristics includes the main component of (1-x)(BaTiO.sub.3)-x(Ba.sub.2LiTa.sub.5O.sub.15) formulated in accordance with the relative molar ratio of up to 100 mole composite dielectric ceramics and a predetermined ratio of one or multiple oxide subcomponents corresponding to 100 moles of the main component. The oxide subcomponents of Li.sub.2TiO.sub.3, BaSiO.sub.3, (Ba.sub.0.6Ca.sub.0.4)SiO.sub.3 and SiO.sub.2 can be used as sintering aids to provide a sintering promotion effect. The oxide subcomponents of CaO, MnO, MgO can also be selected used to improve dielectric stability. More particularly, CaO has the advantages of improving the anti-reduction ability and increasing the coefficient of resistance. Therefore, with the adding of the oxide subcomponents and their interactions, the rate of change of the TCC curve of the composite dielectric ceramic material (1-x)(BaTiO.sub.3)-x(Ba.sub.2LiTa.sub.5O.sub.15) in the temperature range of 55 C.200 C. is significantly inhibited, and its dielectric constant (k-values) is also well improved.

A perovskite ceramic composition that contains Sn, Ba, and Ti, and where the Sn content is within a range of about 0.001 parts by molSnabout 0.999 parts by mole with respect to 100 parts by mole of the Ti. The perovskite ceramic composition can be used in a composition that further includes a rare earth element R, Mn, and Si, and optionally Mg, where proportions of the R, the Mn, the Si, and the optional Mg, satisfy R: 0<Rabout 10 parts by mole, Mn: 0<Mnabout 5 parts by mole, Si: 0<Siabout 5 parts by mole Mg: 0<Mgabout 5 parts by mole with respect to 100 parts by mole of Ti.

A multilayer ceramic capacitor that includes a laminated body having a plurality of ceramic layers including crystal grains that have a perovskite structure, and a plurality of internal electrode layers; and external electrodes on first and second end surfaces of the laminated body and electrically connected to respective sets of the plurality of internal electrodes. In the ceramic layers, when the content of Ti is 100 parts by mol, the ceramic layers contain Ca at 0.10 to 15.00 parts by mol; Mg at 0.0010 to 0.0097 parts by mol; R at 0.50 to 4.00 parts by mol; M at 0.10 to 2.00 parts by mol; and Si at 0.50 to 2.00 parts by mol, and core parts of the crystal grains contain Ca.

Disclosed herein is a ceramic body comprising at least one phase comprising a pseudobrookite-type crystal structure and at least one phase comprising zirconium tin titanate. Also disclosed are porous ceramic honeycomb structures comprising a ceramic body comprising at least one phase comprising a pseudobrookite-type crystal structure and at least one phase comprising zirconium tin titanate and methods of preparing a ceramic body comprising at least one phase comprising a pseudobrookite-type crystal structure and at least one phase comprising zirconium tin titanate.

LTCC devices are produced from dielectric compositions comprising a mixture of precursor materials that, upon firing, forms a dielectric material comprising a matrix of titanates of alkaline earth metals, the matrix doped with at least one selected from rare-earth element, aluminum oxide, silicon oxide and bismuth oxide.

The present invention provides a refractory composition containing expandable powder that consists of an alkali metal oxide and silicon oxide and is coated onto a steel frame structure of a building or a structure requiring fire prevention or fireproofing in order to prevent the strength or resistance force of the structure from being deteriorated by high-temperature heat in case of fire. The refractory composition of the present invention specifically consists of 1 wt % to 50 wt % of expandable powder composed of silicate, 20 wt % to 80 wt % of silicate binder, 0.05 wt % to 5 wt % of stabilizer, and 0.01 wt % to 10 wt % of fiber.

An article may include a substrate and a coating system on the substrate. The coating system may include a thermal and/or environmental barrier coating (T/EBC) layer, wherein the T/EBC layer includes a silicate phase including more than one metal cation.

A composite material consisting of a matrix made of at least one aluminosilicate notably selected from barium aluminosilicate BAS, barium and strontium aluminosilicate BSAS, strontium aluminosilicate SAS, and mixtures thereof, reinforced by reinforcements made of at least one metal or metalloid oxide, the expansion coefficient of which is close to that of said at least one aluminosilicate. A method for preparing said composite material. A composite material according to the invention notably finding its application in the aeronautical or aerospace field, for example for the manufacture of radomes.