[Problem] The aim of the present invention lies in providing a glass ceramic sintered compact in which dielectric loss in a high-frequency region is reduced, without any reduction in sintering density, and also in providing a wiring board employing same. [Solution] A glass ceramic sintered compact containing a glass component, a ceramic filler and a composite oxide, characterized in that the glass component is crystallized glass on which is deposited a diopside oxide crystal phase including at least Mg, Ca and Si, and the composite oxide includes at least Al and Co.

The piezoelectric composition is represented by the following Chemical Formula (1):

x[Bi.sub.mFeO.sub.3]-y[Ba.sub.mTiO.sub.3]-z[Bi.sub.mAlO.sub.3](1)

wherein 0.5x0.7995, 0.2y0.4, 0.0005z0.1, x+y+z=1, 0.96m1.04.

The present disclosure provides a metal compound. The metal compound is represented by a formula (I): Cu.sub.2A.sub.?B.sub.2-?O.sub.4-? (I). A contains at least one element selected from the groups 6 and 8 of the periodic table. B contains at least one element selected from the group 13 of the periodic table, 0<?<2, and 0<?<1.5. Polymer article containing the metal compound and method for preparing the polymer article as well as selective metallization of a surface of the polymer article are also provided. In addition, the present disclosure provides an ink composition and the selective metallization for a surface of the insulative substrate using the ink composition.

Thermoelectric materials based on tetrahedrite structures for thermoelectric devices and methods for producing thermoelectric materials and devices are disclosed.

The present invention provides a magnesium oxide powder capable of restraining the deformation of the internal circumferential shape of an annealed coil, and further giving a sufficiently uniform coat external appearance after the annealing; and a method for producing the powder. The magnesium oxide powder of the invention is a magnesium oxide powder including an Fe element, wherein a content of the Fe element is from 0.03 to 0.20% by weight, and at least a part of the Fe element has a cluster structure.

A magnetic hydrotalcite composite which is useful in fields such as wastewater treatment, ultraviolet absorption, electromagnetic wave absorption and acid gas absorption, and a production method thereof. The magnetic hydrotalcite composite comprises an inner layer and an outer layer, in which the inner layer is made of a hydrotalcite compound and the outer layer is made of a ferrite compound.

The present invention relates to Li-ion cells area, particularly relates to lithium source material and preparation method thereof and use in Li-ion cells. Wherein the lithium source material which is represented by a formula Li.sub.yFe.sub.1-xM.sub.xO.sub.4R.sub.z, wherein M represents one or more of transition metal elements, R represents halogen element, 0x0.9, 0<z0.2, 3.5<y[5(1x)+6x]. The lithium source material of the present invention which is lithium deficient relative to its stoichiometric lithium formulation, is a lithium source additive material to the cathode material for Li-ion cells, and exhibits high capacity and high stability.

The present disclosure relates to the technical field of batteries, and in particular, to a modified lithium ion negative electrode material, and preparation therefor and use thereof. The preparation method includes the following steps: dropwise adding a mixed solution of a titanium source and a lithium source into a mixed solution of an iron salt and an organic acid, adjusting the pH to 5.0-7.0, and stirring to obtain a wet gel; drying and crushing the wet gel, and then calcinating to obtain a LiFeTiO.sub.4 composite oxide; and reducing the LiFeTiO.sub.4 composite oxide to obtain the modified lithium ion negative electrode material. In the present disclosure, a spinel modified negative electrode material lithium iron titanium oxide is synthesized by using a citric acid sol-gel method, thereby not only greatly improving the charging and discharging capacity thereof, but also improving the large-current charging and discharging capability thereof.

A stabilized cathode composition is disclosed. The composition includes the formula: AxMChy, wherein x is 1 to 5; y is 2 to 5; A is selected from the group consisting of: Li, Na, K, Mg, and Ca; M is selected from the group consisting of Ni and Co free d-block transition metals or p-block metals or combination of two or more thereof, Ch is selected from the group consisting of S, Se or their combination with O and/or Te.

The present invention relates to a method for preparing a lithium iron phosphate nanopowder coated with carbon, including the steps of (a) preparing a mixture solution by adding a lithium precursor, an iron precursor and a phosphorus precursor in a glycerol solvent, (b) putting the mixture solution into a reactor and reacting to prepare amorphous lithium iron phosphate nanoseed particle, and (c) heat treating the lithium iron phosphate nanoseed particle thus to prepare the lithium iron phosphate nanopowder coated with carbon on a portion or a whole of a surface of a particle, and a lithium iron phosphate nanopowder coated with carbon prepared by the above method. The lithium iron phosphate nanopowder coated with carbon having controlled particle size and particle size distribution may be prepared in a short time by performing two simple steps.