Abstract: A glass ceramic sintered product obtained by sintering a mixture powder containing a BaO-containing glass, metal oxide particles having a coefficient of linear thermal expansion at 40 to 400° C. of not smaller than 6 ppm/°C., and a Zr compound and, particularly, containing the Zr compound in an amount of from 0.1 to 30% by weight calculated as Zr02, and exhibiting a coefficient of linear thermal expansion at 40 to 400° C. of from 8.5 to 18 ppm/°C. The glass ceramic sintered product exhibits excellent resistance against chemicals and does not discolor even when subjected to treatment with an acidic or alkaline solution in the step of plating. A wiring board using the glass ceramic sintered product as an insulating substrate exhibits a coefficient of linear thermal expansion substantially similar to that of an external circuit board, effectively suppressing the occurrence of thermal stress and cracking.

Abstract: A structure for mounting a wiring board in which the wiring board including a ceramics insulating board, metallized wiring layers arranged on said insulating board, and a plurality of connection terminals mounted on said insulating board and electrically connected to said metallized wiring layer, is placed on a mother board having wiring conductors formed on the surface of an insulator which contains an organic resin, and the connection terminals of said wiring board are connected by brazing to the wiring conductors of said mother board, wherein a value F1 defined by the following formula (1):F1=L.times..DELTA..alpha./H.sup.2 (1)wherein L is a distance (mm) between the two connection terminals which are most separated away from each other among a plurality of connection terminals mounted on said insulating board, .DELTA..alpha. is a difference in the coefficient of thermal expansion (ppm/.degree. C.) between the insulating board of said wiring board and said mother board at 40 to 400.degree. C.

Abstract: In a concentric cylinder macromolecule represented by a combination of B(2,1)n (n=1, 2, . . . ), each layer thereof has a conductivity of metal and hence there is obtained a concentric cylinder having a high conductivity. In graphite, the layers are bonded with each other by a weak van der Waals force and a two-dimensional band structure can be assumed. In a multi-layer cylinder, since the number of hexagons in the radial direction varies between the layers, the layers are much more independent of each other. There are accordingly implemented a semiconductor having a narrow band gap and a semiconductor having a relatively wide band gap; consequently, the macromolecule can be broadly adopted for various functional devices.

Abstract: A low-temperature calcined ceramic of the present invention comprises a sintered body obtained by calcining a mixture of a glass and an SiO.sub.2 filler such as quartz or cristobalite, wherein the sintered body contains an SiO.sub.2 crystal having an X-ray diffraction image that the peak at the (101) plane of quartz or cristobalite is shifted at least 0.05.degree. (2.theta.) to the lower angle side. The ceramic containing the shifted crystal of quarts or cristobalite does not have a region of abruptly changing the thermal expansion and has a substantially linear thermal expansion curve. Accordingly, when the ceramic is used as an insulating substrate of a wiring boad, there is no possibility of abruptly causing the thermal expansion by heating, etc., at mounting on an external electric circuit boad and the occurrence of the inferior connection, etc., by thermal expansion can be effectively prevented.

Abstract: In a circuit board obtained by providing a metallized layer of wiring on the surface or interior of an insulation substrate, the insulation substrate is, for example, a multi-layer circuit board or a package for semiconductor element, the insutating substrate obtained from a sintered body having a linear expansion coefficient of 8 to 18 ppm/.degree. C. at 40.degree. to 400.degree. C. which is prepared by sintering a molded body containing 20 to 80% of a glass having a liner expansion coefficient of 6 to 18 ppm/.degree. C. at 40.degree. to 400.degree. C. and 80 to 20% of a filler having a linear expansion coefficient of at least 6 ppm/.degree. C.

Abstract: A high-molecular weight carbon material in which cylindrical high-molecular weight carbon materials in the form of a cylindrical tube are bonded through a soccer ball-like spherical high-molecular weight carbon material as a point of junction, the respective cylindrical high-molecular weight carbon materials being formed by rolling a plane network composed of a benzene shell-like hexagonal molecule formed of covalent-bonded carbon atoms, and the soccer ball-like spherical high-molecular weight carbon material being formed of material including five- and six-membered carbon rings. The high-molecular weight carbon material is useful as a material for various functional devices.