A glass powder of the present invention is a glass powder, which is formed of alkali borosilicate glass, wherein the glass powder includes 0.1 mol % to 1.0 mol %, provided that 1.0 mol % is excluded, of Li.sub.2O+Na.sub.2O+K.sub.2O in a glass composition, has a molar ratio Li.sub.2O/(Li.sub.2O+Na.sub.2O+K.sub.2O) of from 0.35 to 0.65, a molar ratio Na.sub.2O/(Li.sub.2O+Na.sub.2O+K.sub.2O) of from 0.25 to 0.55, and a molar ratio K.sub.2O/(Li.sub.2O+Na.sub.2O+K.sub.2O) of from 0.025 to 0.20, and has a specific dielectric constant at 25° C. and 16 GHz of from 3.5 to 4.0 and a dielectric dissipation factor at 25° C. and 16 GHz of 0.0020 or less.

Provided is a glass substrate having low chargeability. A glass substrate contains, as a glass composition in terms of % by mass, 1.7 to less than 9% B.sub.2O.sub.3, 0.01% or less Li.sub.2O, 0.001 to 0.03% Na.sub.2O, 0.0001 to 0.007% K.sub.2O, 0.0011 to 0.035% Na.sub.2O+K.sub.2O, and more than 0 to 0.4% SnO.sub.2.

A glass-ceramic includes SiO2 in a range of 40 mol. % to 80 mol. %; Al.sub.2O.sub.3 in a range of 5 mol. % to 20 mol. %; MgO in a range of 5 mol. % to 20 mol. %; and at least one of B.sub.2O.sub.3, ZnO, and TiO.sub.2, each in a range of 0 mol. % to 10 mol. %, such that the glass-ceramic further comprises a magnesium aluminosilicate crystalline phase at a concentration in a range of 5 wt. % to 80 wt. % of the glass-ceramic.

A glass-ceramic includes SiO2 in a range of 40 mol. % to 80 mol. %; Al.sub.2O.sub.3 in a range of 5 mol. % to 20 mol. %; MgO in a range of 5 mol. % to 20 mol. %; and at least one of B.sub.2O.sub.3, ZnO, and TiO.sub.2, each in a range of 0 mol. % to 10 mol. %, such that the glass-ceramic further comprises a magnesium aluminosilicate crystalline phase at a concentration in a range of 5 wt. % to 80 wt. % of the glass-ceramic.

Provided is a glass substrate with which it is possible to reduce dielectric loss in high-frequency signals, and which also has excellent thermal shock resistance. This invention satisfies the relation {Young's modulus (GPa)×average thermal expansion coefficient (ppm/° C.) at 50-350° C.}≤300 (GPa.Math.ppm/° C.), wherein the relative dielectric constant at 20° C. and 35 GHz does not exceed 10, and the dielectric dissipation factor at 20° C. and 35 GHz does not exceed 0.006.

Glass-based articles, such as glass-ceramic articles, and the properties thereof are disclosed. In embodiments, the glass-based article may comprise the glass-based article has a phase assemblage comprising petalite and lithium disilicate.

A glass ceramic sintered body having a small dielectric loss in a high frequency band of 10 GHz or higher and stable characteristics against temperature variation and a wiring substrate using the same are provided. The glass ceramic sintered body contains crystallized glass, an alumina filler, silica, and strontium titanate. The content of the crystallized glass is 50 mass % to 80 mass %, the content of the alumina filler is 15.6 mass % to 31.2 mass % in terms of Al.sub.2O.sub.3, the content of silica is 0.4 mass % to 4.8 mass % in terms of SiO.sub.2, and the content of the strontium titanate is 4 mass % to 14 mass % in terms of SrTiO.sub.3.

A multilayer coil component includes a multilayer body in which a plurality of insulating layers are stacked and inside of which a coil is provided, and first and second outer electrodes provided on surfaces of the multilayer body and electrically connected to the coil. The multilayer body has first and second end surfaces, first and second main surfaces, and first and second side surfaces. The first outer electrode extends from at least part of the first end surface of the multilayer body across part of the first main surface and the second outer electrode extends from at least part of the second end surface of the multilayer body across part of the first main surface. A transmission coefficient S21 is −1.0 dB or higher in a range from 1 GHz to 40 GHz and is −1.5 dB or higher in a range from 40 GHz to 60 GHz.

A multilayer coil component includes a multilayer body in which a plurality of insulating layers are stacked and inside of which a coil is provided, and first and second outer electrodes provided on surfaces of the multilayer body and electrically connected to the coil. The multilayer body has first and second end surfaces, first and second main surfaces, and first and second side surfaces. The first outer electrode extends from at least part of the first end surface of the multilayer body across part of the first main surface and the second outer electrode extends from at least part of the second end surface of the multilayer body across part of the first main surface. A transmission coefficient S21 is −1.0 dB or higher in a range from 1 GHz to 40 GHz and is −1.5 dB or higher in a range from 40 GHz to 60 GHz.

Provided is a glass substrate with which it is possible to reduce dielectric loss in high-frequency signals, and which also has excellent thermal shock resistance. This invention satisfies the relation {Young's modulus (GPa)×average thermal expansion coefficient (ppm/° C.) at 50-350° C.}≤300 (GPa.Math.ppm/° C.), wherein the relative dielectric constant at 20° C. and 35 GHz does not exceed 10, and the dielectric dissipation factor at 20° C. and 35 GHz does not exceed 0.006.