Abstract: An R-cut substrate is prepared by cutting lumbered synthetic quartz crystal along a surface parallel to the R-face. The surface of the thus obtained R-cut substrate has a structure in which the R-face smoothest in terms of the crystal structure accounts for the most part of the surface, and the m- and r-faces are exposed on this surface to extend in a direction parallel to the X-axis albeit only slightly upon processing. After catalytic metals are arranged on the surface of the R-cut substrate, a carbon source gas is supplied onto the surface of the R-cut substrate to grow carbon nanotubes in accordance with the crystal lattice structure using the crystal metals as nuclei. This makes it possible to manufacture carbon nanotubes with a good orientation and linearity.

Abstract: Disclosed is a package for housing semiconductor elements, which comprises an insulating substrate having in the interior thereof a cavity for attaching and housing semiconductor elements and a lid member covering said cavity, wherein the insulating substrate is composed of a mullite sintered body comprising 70 to 95% by weight of mullite and 5 to 30% by weight, as the total content, of silica (SiO.sub.2) and at least one member selected from the group consisting of magnesia (MgO) and calcia (CaO), and SiO.sub.2, MgO and CaO are present in the following composition expressed by % by weight based on the three components:100>SiO.sub.2 .gtoreq.60,40.gtoreq.MgO.gtoreq.O and40.gtoreq.CaO.gtoreq.O.

Abstract: A paste of a glazing composition is coated on the entire surface of a ceramic substrate having a metallized metal portion, and the paste-coated ceramic substrate is sintered in a reducing atmosphere, and a glazing layer is formed on the entire surface of the metallized metal portion by utilizing the repellency of the melt of the glazing composition to the metallized metal portion. A glazing composition comprising SiO.sub.2, B.sub.2 O.sub.3, BaO, Al.sub.2 O.sub.3 and an alkali metal oxide or a glazing composition comprising SiO.sub.2, BaO, Al.sub.2 O.sub.3, CaO and MgO or SrO is used. An acrylic resin syrup, especially an isobutyl methacrylate resin syrup, is used as a binder of a coating paste for forming a glazing layer.

Abstract: A paste of a glazing composition is coated on the entire surface of a ceramic substrate having a metallized metal portion, and the paste-coated ceramic substrate is sintered in a reducing atmosphere, and a glazing layer is formed on the entire surface of the metallized metal portion by utilizing the repellency of the melt of the glazing composition to the metallized metal portion. A glazing composition comprising SiO.sub.2, B.sub.2 O.sub.3, BaO, Al.sub.2 O.sub.3 and an alkali metal oxide or a glazing composition comprising SiO.sub.2, BaO, Al.sub.2 O.sub.3, CaO and MgO or SrO is used. An acrylic resin syrup, especially an isobutyl methacrylate resin syrup, is used as a binder of a coating paste for forming a glazing layer.

Abstract: A paste of a glazing composition is coated on the entire surface of a ceramic substrate having a metallized metal portion, and the paste-coated ceramic substrate is sintered in a reducing atmosphere, and a glazing layer is formed on the entire surface of the metallized metal portion by utilizing the repellency of the melt of the glazing composition to the metallized metal portion. A glazing composition comprising SiO.sub.2, B.sub.2 O.sub.3, BaO, Al.sub.2 O.sub.3 and an alkali metal oxide or a glazing composition comprising SiO.sub.2, BaO, Al.sub.2 O.sub.3, CaO and MgO or SrO is used. An acrylic resin syrup, especially an isobutyl methacrylate resin syrup, is used as a binder of a coating paste for forming a glazing layer.