Abstract: A single-crystal diamond having a first facet plane is prepared. The single-crystal diamond is fixed to the support based on the first facet plane. An X-ray image of the single-crystal diamond is captured, the X-ray image being an X-ray image in which a crystal orientation of the single-crystal diamond is associated with an X-ray emission direction by associating the support to which the single-crystal diamond is fixed with the X-ray emission direction. A position of an inclusion of the single-crystal diamond in the single-crystal diamond is specified based on the X-ray image. It is determined whether or not a shape of the diamond tool intermediate is extractable from the single-crystal diamond with the inclusion being not included in an inclusion-excluded region. The shape of the diamond tool intermediate is extracted from the single-crystal diamond with the inclusion being not included in the inclusion-excluded region.

Abstract: A method of measuring a concentration of nitrogen in diamond includes a first step, a second step, and a third step. In the first step, diamond is arranged in the inside of an integrating sphere. In the second step, visible light is emitted to the inside of the integrating sphere and the visible light that is reflected by an inner surface of the integrating sphere and passes through or is reflected by diamond arranged in the inside of the integrating sphere is received. In the third step, the concentration of nitrogen in diamond is calculated based on data on received visible light and a mass of diamond.

Abstract: A single-crystal diamond having a first facet plane is prepared. The single-crystal diamond is fixed to the support based on the first facet plane. An X-ray image of the single-crystal diamond is captured, the X-ray image being an X-ray image in which a crystal orientation of the single-crystal diamond is associated with an X-ray emission direction by associating the support to which the single-crystal diamond is fixed with the X-ray emission direction. A position of an inclusion of the single-crystal diamond in the single-crystal diamond is specified based on the X-ray image. It is determined whether or not a shape of the diamond tool intermediate is extractable from the single-crystal diamond with the inclusion being not included in an inclusion-excluded region. The shape of the diamond tool intermediate is extracted from the single-crystal diamond with the inclusion being not included in the inclusion-excluded region.

Abstract: A shaft portion and a blade portion provided on a side surface of the shaft portion are included, and the blade portion includes cutting blades arranged in a plurality of lines on a side surface of the shaft portion along a peripheral direction, and arranged in a plurality of stages in an extending direction of a shaft center of the shaft portion in each line. Further, the cutting blade has a radial-direction clearance angle, a tip end-side clearance angle, and a base end-side clearance angle.

Abstract: The diamond coated tool of the present invention is a diamond coated tool including a base material and a diamond layer coating a surface of the base material, and characterized in that the surface of the base material has an arithmetic average roughness Ra of not less than 0.1 ?m and not more than 10 ?m and an average length of roughness profile elements RSm of not less than 3.1 ?m and not more than 5.4 ?m, and that the diamond layer has a plurality of cavities at a portion bordering on the base material.

Abstract: The diamond coated tool of the present invention is a diamond coated tool including a base material and a diamond layer coating a surface of the base material, and characterized in that the surface of the base material has an arithmetic average roughness Ra of not less than 0.1 ?m and not more than 10 ?m and an average length of roughness profile elements RSm of not less than 3.1 ?m and not more than 5.4 ?m, and that the diamond layer has a plurality of cavities at a portion bordering on the base material.

Abstract: A shaft portion and a blade portion provided on a side surface of the shaft portion are included, and the blade portion includes cutting blades arranged in a plurality of lines on a side surface of the shaft portion along a peripheral direction, and arranged in a plurality of stages in an extending direction of a shaft center of the shaft portion in each line. Further, the cutting blade has a radial-direction clearance angle, a tip end-side clearance angle, and a base end-side clearance angle.

Abstract: The present invention provides a diamond coated tool which is resistant to exfoliation at an interface between a base material and a diamond layer. The diamond coated tool of the present invention is a diamond coated tool including a base material and a diamond layer coating a surface of the base material, and characterized in that the surface of the base material has an arithmetic average roughness Ra of not less than 0.1 ?m and not more than 10 ?m and an average length of roughness profile elements RSm of not less than 1 ?m and not more than 100 ?m, and that the diamond layer has a plurality of cavities extending from a portion bordering on the base material in a crystal growth direction.

Abstract: The diamond coated tool of the present invention is a diamond coated tool including a base material and a diamond layer coating a surface of the base material, and characterized in that the surface of the base material has an arithmetic average roughness Ra of not less than 0.1 ?m and not more than 10 ?m and an average length of roughness profile elements RSm of not less than 3.1 ?m and not more than 5.4 ?m, and that the diamond layer has a plurality of cavities at a portion bordering on the base material.

Abstract: The present invention provides a diamond coated tool which is resistant to exfoliation at an interface between a base material and a diamond layer. The diamond coated tool of the present invention is a diamond coated tool including a base material and a diamond layer coating a surface of the base material, and characterized in that the surface of the base material has an arithmetic average roughness Ra of not less than 0.1 ?m and not more than 10 ?m and an average length of roughness profile elements RSm of not less than 1 ?m and not more than 100 ?m, and that the diamond layer has a plurality of cavities extending from a portion bordering on the base material in a crystal growth direction.

Abstract: A small diameter portion having an outside diameter smaller than a diameter of the drill is formed on a front end side of a body of the drill in which a cutting edge includes at least two portions, that is, a rotation center side cutting edge portion and an outer peripheral side cutting edge portion and point angles of the respective cutting edge portions reducing gradually from the rotation center side cutting edge portion to the outer peripheral side cutting edge portion. The cutting edge with the point angles varied is formed in the small diameter portion. A flat cutting edge having an inclination angle ? of 30° or less with respect to a line perpendicular to an axis of the drill is provided in a step portion formed between the small diameter portion and a large diameter portion.

Abstract: The present invention provides a diamond coated tool which is resistant to exfoliation at an interface between a base material and a diamond layer. The diamond coated tool of the present invention is a diamond coated tool including a base material and a diamond layer coating a surface of the base material, and characterized in that the surface of the base material has an arithmetic average roughness Ra of not less than 0.1 ?m and not more than 10 ?m and an average length of roughness profile elements RSm of not less than 1 ?m and not more than 100 ?m, and that the diamond layer has a plurality of cavities extending from a portion bordering on the base material in a crystal growth direction.

Abstract: A small diameter portion having an outside diameter smaller than a diameter of the drill is formed on a front end side of a body of the drill in which a cutting edge includes at least two portions, that is, a rotation center side cutting edge portion and an outer peripheral side cutting edge portion and point angles of the respective cutting edge portions reducing gradually from the rotation center side cutting edge portion to the outer peripheral side cutting edge portion. The cutting edge with the point angles varied is formed in the small diameter portion. A flat cutting edge having an inclination angle ? of 30° or less with respect to a line perpendicular to an axis of the drill is provided in a step portion formed between the small diameter portion and a large diameter portion.

Abstract: A diamond coated tool according to the present invention includes a base material, and a diamond layer coating a surface of the base material, the diamond layer containing a diamond, 1.0×1018 to 1.0×1022 atoms/cm3 of boron, and 1.0×1017 to 1.0×1021 atoms/cm3 of nitrogen.

Abstract: A method for growing a low-resistance phosphorus-doped epitaxial thin film having a specific resistance of 300 ?cm or less at 300 K on a principal surface of a {111} monocrystal substrate under conditions in which the phosphorus atom/carbon atom ratio is 3% or higher, includes the principal surface having an off-angle of 0.50° or greater. The diamond monocrystal having a low-resistance phosphorus-doped diamond epitaxial thin film is such that the thin-film surface has an off-angle of 0.50° or greater with respect to the {111} plane, and the specific resistance of the low-resistance phosphorus-doped diamond epitaxial thin film is 300 ?cm or less at 300 K.

Abstract: The present invention provides a diamond coated tool which is resistant to exfoliation at an interface between a base material and a diamond layer. The diamond coated tool of the present invention is a diamond coated tool including a base material and a diamond layer coating a surface of the base material, and characterized in that the surface of the base material has an arithmetic average roughness Ra of not less than 0.1 ?m and not more than 10 ?m and an average length of roughness profile elements RSm of not less than 1 ?m and not more than 100 ?m, and that the diamond layer has a plurality of cavities extending from a portion bordering on the base material in a crystal growth direction.

Abstract: A diamond single crystal substrate obtained by a vapor-phase growth method, wherein the diamond intrinsic Raman shift of the diamond single crystal substrate surface measured by microscopic Raman spectroscopy with a focused beam spot diameter of excitation light of 2 ?m is deviated by +0.5 cm?1 or more to +3.0 cm?1 or less from the standard Raman shift quantity of strain-free diamond, in a region (region A) which is more than 0% to not more than 25% of the surface, and is deviated by ?1.0 cm?1 or more to less than +0.5 cm?1 from the standard Raman shift quantity of strain-free diamond, in a region (region B) of the surface other than the region A. The diamond single crystal substrate can be obtained with a large size and high-quality without cracking and is suitable for semiconductor materials, electronic components, and optical components or the like.

Abstract: It is an object of the present invention to provide a diamond substrate with high toughness, a large surface area, and high quality, for use in semiconductor materials, electronic components, optical components, and so forth, and a method for manufacturing this substrate. A diamond polycrystalline film is laminated on the surface of a diamond monocrystalline substrate to create a diamond composite substrate. In said diamond composite substrate, it is preferable that the main face, which has the largest surface area of the diamond monocrystalline substrate, be the {100} plane, and the diamond polycrystalline film be laminated on the opposite face parallel to this face. The diamond monocrystalline substrate 3 may be made up of a plurality of diamond monocrystals having the same orientation of the main face, and these plurality of diamond monocrystals may be joined by a diamond crystal layer 4 to create a diamond composite substrate 2.

Abstract: A method for manufacturing a diamond single crystal substrate, in which a single crystal is grown from a diamond single crystal serving as a seed substrate by vapor phase synthesis, said method comprising: preparing a diamond single crystal seed substrate which has a main surface whose planar orientation falls within an inclination range of not more than 8 degrees relative to a {100} plane or a {111} plane, as a seed substrate; forming a plurality of planes of different orientation which are inclined in the outer peripheral direction of the main surface relative to the main surface on one side of this seed substrate, by machining; and then growing a diamond single crystal by vapor phase synthesis.