262 results about "Titanium atom" patented technology

A method for manufacturing semiconductor device is disclosed which forms a high dielectric layer using atomic layer deposition (ALD). The method for forming a high dielectric layer having a first metal element, a titanium atom and an oxygen atom includes: a) preparing a substrate where a predetermined bottom layer is formed; b) on a surface of the substrate, adsorbing a first organism source combining a ligand, wherein the ligand includes at least oxygen and C-H combination in the first metal element; c) on the surface of the substrate, forming an atomic layer of the first metal element and the oxygen by inducing reduction reaction of the first organism source and a NH3 gas, which are adsorbed on the surface of the substrate; d) on the surface of the substrate where the atomic layer is formed, adsorbing a second organism source combining a ligand, wherein the ligand includes at least oxygen and C-H combination on the titanium; and e) on the surface of the substrate, forming an atomic layer of the titanium and the oxygen by inducing reduction reaction of the second organism source and the NH3 gas, which are adsorbed on the surface of the substrate.

There are provided;

• [0001]
  • (i) a solid catalyst component obtained by contacting a trivalent titanium atom-containing solid catalyst component precursor (C) with a halogeno compound (A) of the 13 or 14 group of elements in the periodic table of the elements and an electron donor (B), or a solid catalyst component obtained by contacting an intermediate product with a titanium-halogen bond-carrying compound (D), the intermediate product being obtained by contacting the solid catalyst component precursor (C) with a halogeno compound (A′) of the 14 group of elements in the periodic table of the elements and the electron donor (B), or a solid catalyst component comprising a magnesium atom, a titanium atom, a halogen atom and an electron donor and having a relative surface area of not more than 30 m²/g, the catalyst component being superior in a particle form, and
  [0002]
  • (ii) a catalyst comprising the solid catalyst component and an organoaluminum compound, the catalyst being high in polymerization activity.

A metal compound represented by general formula (I):

wherein R¹, R², R³, and R⁴ each represent an alkyl group having 1 to 4 carbon atoms; A represents an alkanediyl group having 1 to 8 carbon atoms; M represents a lead atom, a titanium atom or a zirconium atom; n represents 2 when M is a lead atom or 4 when M is a titanium or zirconium atom. The metal compound has a low melting point and is therefore deliverable in a liquid state, has a high vapor pressure and is therefore easy to vaporize, and, when mixed with other metal compound, undergoes no denaturation due to a chemical reaction. The metal compound is suitable as a material of thin film formation processes involving vaporization of a metal compound, such as CVD.

This invention relates to a method to prepare mezoporous empty-centered titanium dioxide powders, which comprises following steps: titanium chloride is made into hydrosol with pure water, diluted and introduced into a spray dryer for spray drying. The subsequent product is empty-centered ball-shaped powder made up of nanosized titanium dioxide particles and the preceding titanium chloride is titanium tetrachloride or titanium trichloride. The titanium dioxide particles prepared in this invention all have mezoporous empty-centered ball-shaped structure and the empty-centered wall is made up of nanosized titanium dioxide particles and mezopores, on the surface of which titanium atoms possess a fraction of as high as 70%. As only titanium tetrachloride is adopted as precursor and no other reagent is necessary, the product is highly pure and has excellent photocatalytic properties. This method has the advantages of high yield, low cost, easily controlled technique and convenience for magnification experiment. Besides, there are not severe requirements for facilities and this method is suitable for industrial production.

Disclosed is a process for producing a polybutylene terephthalate continuously from terephthalic acid and 1,4-butanediol using a titanium compound and a compound of at least one metal selected from the metals belonging to Groups I and II on the periodic table as catalysts, the process satisfying the following conditions (a) to (c): (a) terephthalic acid and 1,4-butanediol are subjected to continuous esterification in the presence of a titanium catalyst in an amount of 460 [mu]mol or less in terms of a titanium atom per mol of a terephthalic acid unit, thereby producing an oligomer; (b) the oligomer is subjected to continuous polycondensation in the presence of a compound of at least one metal selected from the metals belonging to Groups I and II on the periodic table in an amount of 450 [mu]mol or less in terms of the metal atom per mol of a terephthalic acid unit; and (c) until the esterification rate of the oligomer reaches 90% or higher, the compound of the metal may be added in an amount of 300 [mu]mol or less in terms of the metal atom per mol of a terephthalic acid unit, and after the esterification rate of the oligomer reaches 90% or higher, the compound of the metal may be added in an amount of 10 [mu]mol or more in terms of the metal atom per mol of a terephthalic acid unit.

A coating formulation contains the following components (A), (B) and (C): (A) an organic acid-titanium compound having at least one titanium atom and at least one C_2-12 aliphatic organic acid residual group as essential constituents and having no constituent other than the essential constituents, (B) fine particles of a titanate-based compound, said fine particles having an average particle size of from 10 to 100 nm, and (C) an organic solvent. A content of the components (A) is from 0.1 to 1.5 mol/kg in terms of titanium atoms, and a content of the component (B) is from 0.1 to 1.5 mol/kg in terms of titanium atoms. A production process for a titanate-based ceramic film, which makes use of the coating formulation, is also disclosed.

The present invention provides a metallocene compound which produces an olefin polymer having a high molecular weight with a high stereoregularity. The metallocene compound has the following formula (1):

Q(C₅H_4-mR¹_m)(C₅H_4-nR²_n)MXY  (1)

• wherein (C₅H_4-mR¹_m) and (C₅H_4-nR²_n) each independently represent a cyclopentadienyl group;
• C₅H_4-m and C₅H_4-n each independently represent a cyclopentadienyl ring;
• m represents an integer of 1-3;
• n represents an integer of 2 or 3;
• R¹ and R² are each independently a substituent bonded respectively to C₅H_4-m and C₅H_4-n, and represent a hydrocarbon group of 1-20 carbon atoms, a silicon-containing hydrocarbon group of 1-20 carbon atoms or a heteroaromatic group;
• each R¹_m and each R²_n may be the same or different;
• one pair of R²'s in the R²_n are bonded to each other to form at least one ring;
• Q represents a divalent group for cross-linking (C₅H_4-mR¹_m) and (C₅H_4-nR²_n);
• M represents a titanium atom, a zirconium atom or a hafnium atom; and
• X and Y are the same or different and each a hydrogen atom, a halogen atom or a hydrocarbon group.

Cyclic oligomers containing ester linkages are polymerized in the presence of a catalyst having at least one oxygen atom bonded to two metal atoms. At least one of the metal atoms is a tin atom, which is preferably tetravalent, i.e., bonded to three other groups in addition to the oxygen atom. The other metal atom may also be another tin atom, which is again preferably tetravalent, or a zinc, aluminum or titanium atom. The catalyst may contain multiple oxygen atoms that are bonded to two such metal atoms as described. These catalysts are active, efficient polymerization catalysts. They are often liquids at polymerization temperatures. The catalysts can be formed in situ in the polymerization process, which provides additional flexibility in the process and increased storage stability of starting materials.

The invention discloses a preparation method of nitrogen-doped titanium oxide thin film. The method comprises successively introducing titanium-containing gas into a reaction cavity to form silicon-titanium bonds; introducing nitrogen and hydrogen into an atomic layer deposition reaction chamber for plasma discharge, wherein part of nitrogen atoms generated by ionizing the nitrogen form covalent bonds with part of titanium atoms, and non-bonded electrons of the nitrogen atoms bond with ionized hydrogen atoms; introducing an oxygen-containing source into the atomic layer deposition reaction chamber to form titanium-oxygen bonds; and growing layer by layer the titanium oxide thin film containing the nitrogen atoms. The preparation method of the nitrogen-doped titanium oxide thin film provided by the invention utilizes a plasma atomic layer deposition device to dope nitrogen for the titanium dioxide thin film. By utilizing characteristics of monolayer cycle growth of atomic layer deposition and high chemical reactivity of the plasma, the titanium dioxide thin film can be uniformly doped with the nitrogen atoms in the whole thin film structure during a growth process, so that the doped thin film structure is complete, and significant in performance, and can effectively improve utilization rate of TiO2 for visible light.

Provided are a polyester polymerization catalyst with which the generation of foreign materials caused by the catalyst or mold pollution at the time of molding are reduced and polyesters having remarkably superior thermal stability and color tone can be obtained.

Provided is a polyester polymerization catalyst produced by the reaction of a titanium compound and a mannitol in a molar ratio of titanium atom to mannitol of from 1:1 to 1:3. A method for producing a polyester employs the polyester polymerization catalyst.

The invention relates to the technical field of titanium dioxide preparation, and concretely relates to a nitrogen doped titanium dioxide film preparation method. The preparation method comprises the following steps: disposing a silicon substrate in the reaction chamber of an atomic layer deposition apparatus; letting a titanium source gas in the reaction chamber of the atomic layer deposition (ALD) apparatus by treating nitrogen as a carrying gas to make titanium atoms in the titanium source gas be adsorbed on the silicon substrate; letting nitrogen in the reaction chamber of the ALD apparatus, and carrying out plasma discharge for making parts of nitrogen atoms and parts of the titanium atoms form covalent bonds after nitrogen ionization; letting an oxygen-containing source in the reaction chamber of the ALD apparatus for making the titanium atoms unreacted with the nitrogen atoms and oxygen atoms in the oxygen-containing source form titanium-oxygen bonds; and repeating the above steps to grow the nitrogen atom-containing titanium dioxide film layer by layer. The preparation method which utilizes the ALD apparatus to carry out nitrogen doping of the titanium dioxide film has the advantages of realization of the uniform nitrogen doping in a whole structure, high nitrogen element content after nitrogen doping, and substantially increased film performances.

The invention discloses a method for adjusting and controlling the brittle phase in a titanium/aluminum dissimilar metal friction stir welding joint. The method adopts the principle of introducing a third alloy element by adding a zinc-based intermediate layer to block the direct contact between titanium atom and aluminum atom, so as to disturb the generation of brittle phase in a Ti-Al system. The method comprises the following specific steps: mounting a self-made stirring head; clamping a workpiece to be welded and a zinc-based intermediate layer material, and laying the zinc-based intermediate layer material in a position butted with the workpiece to be welded; adjusting the position of the stirring head, so as to enable the stirring head to be in an initial position; setting welding technical parameters including the rotate speed of the stirring head, a welding speed, a welding dip angle and press amount; ensuring that a stirring pin is pressed into the workpiece under the technical parameters and moves in the direction parallel with the joint of the workpiece to be welded at the welding speed, and accomplishing the friction stir welding of the workpiece to be welded. The method realizes the adjustment and control of the brittle phase in the titanium/aluminum dissimilar metal friction stir welding joint, and effectively improves the performance of the welding joint.

The invention discloses a preparation method of a spherical titanium niobate electrode material. The preparation method comprises the following steps that a niobium source and a titanium source are dissolved in a certain amount of organic solvent, and mixing is carried out to obtain a mixed solution, wherein the concentration of niobium in the mixed solution ranges from 0.02 mol/L to 7.8 mol/L, and the ratio of niobium atoms to titanium atoms is 1.6:1 to 2.5:1; the obtained solution is contained in a reaction still, heating and reacting are carried out in a constant-temperature drying box at preset heating temperature, then natural cooling is carried out to reach room temperature, and sediment is obtained; the obtained sediment is washed with deionized water and ethyl alcohol many times, and vacuum drying is carried out at preset drying temperature to obtain powder; the obtained powder is calcined at preset calcining temperature, and the spherical titanium niobate electrode material is obtained. The invention further discloses the spherical titanium niobate electrode material.

TiO2 Nano grains with size less than and equal to 2nm are formed on surface of TiO2 Nano grain with size larger than 10 nm through chemical deposition method, thus surface state of TiO2 Nano grain is changed. Number of unsaturated titanium atoms is much more than number of TiO2 Nano grain with large size. The said changed surface state of TiO2 Nano grain possesses better characteristic of chemical adsorption so as to increase proportion of chemical adsorption of dye molecule on surface of Nano crystal. Result is to raise opto-electronic conversion efficiency of battery of TiO2 Nano crystal.

A method for manufacturing a memory device having a metal nanocrystal charge storage structure. A substrate is provided and a first layer of dielectric material is grown on the substrate. An absorption layer is formed on the first layer of dielectric material. The absorption layer includes a plurality of titanium atoms bonded to the first layer of dielectric material, a nitrogen atom bonded to each titanium atom, and at least one ligand bonded to the nitrogen atom. The at least one ligand is removed from the nitrogen atoms to form nucleation centers. A metal such as tungsten is bonded to the nucleation centers to form metallic islands. A dielectric material is formed on the nucleation centers and annealed to form a nanocrystal layer. A control oxide is formed over the nanocrystal layer and a gate electrode is formed on the control oxide.

The present invention provides a biaxially oriented polyester film for a backsheet of solar batteries which exhibits a good hydrolysis resistance and a low haze. The present invention relates to a biaxially oriented polyester film for a backsheet of solar batteries, comprising titanium in an amount of not more than 20 ppm in terms of a titanium atom, phosphorus in an amount of not more than 70 ppm in terms of a phosphorus atom, and antimony in an amount of not more than 10 ppm in terms of an antimony atom; and having a carboxyl end group content of not more than 26 equivalents/t and an intrinsic viscosity of 0.65 to 0.90.

The invention discloses a synthesis method of a titanium-containing nano-mordenite molecular sieve, comprising the following steps of: firstly, dissolving an aluminum source in sodium hydroxide solution, adding a silicon source, stirring by strong magnetic force at room temperature for evenly dispersing, mixing the evenly-dispersed silicon source and aluminum source solution to prepare glue at room temperature, adding the mordenite molecular sieve serving as a seed crystal, quickly adding Ti-containing micromolecule organic amine solution into the mixed solution, stirring by strong magnetic force at room temperature for evenly dispersing, transferring into a reaction crystallization kettle, carrying out crystallization reaction at 150-170DEG C for 0.5-3d, and carrying out conventional leaching, washing and drying operations to obtain a solid product. The synthesis method has the characteristic that the titanium atom is led into a micropore skeleton in the manner of quadridentate and high dispersion by using hydro-thermal synthesis, the micromolecule organic amine serving as the chelant of impurity metal titanium atom, and the one-step method is used, so that the obtained titanium-containing nano-mordenite molecular sieve is high in crystallinity and purity, controllable in particle size and shape and low in cost, and causes little environment pollution, thereby being convenient for the large-scale industrial production.

The invention discloses a lead titanate nanotube with a one-dimensional crystal structure, which has the characteristics as follows: (a) a space group is I4/m; (b) cell parameters show that each PbTiO3 unit cell is composed of forty atoms, wherein, Pb:Ti:O=1:1:3; and (c) x, y, and z space positions of a lead atom, a titanium atom and an oxygen atom in each unit cell are respectively as follows: Pb (0.165, 0.151 and 0.5), Ti (0.471, 0.142 and 0.5), O1 (0.605, 0.028 and 0.5), O2 (0.169, 0.289 and 0.0) and O3 (0.543, 0.260 and 0.5). The lead titanate nanotube prepared by a hydrothermal method has the one-dimensional crystal structure, high purity, good crystallization stability and good dispersibility, and has wide application prospect in the fields such as microelectronic devices, drivers, sensors and the like. The preparation method of the invention has simple equipment, easy control of process conditions, low cost and easy industrialized production.

An object of the present invention is to provide a polybutylene terephthalate pellet capable of producing a molded product which is excellent in color tone, hydrolysis resistance, transparency and molding stability, and has a less content of impurities. A polybutylene terephthalate pellet comprises polybutylene terephthalate containing titanium in an amount of not more than 90 ppm by weight, as calculated as titanium atom, and having an end methoxycarbonyl group concentration of not more than 0.5 μeq/g, wherein said pellet has an average intrinsic viscosity of 0.90 to 2.00 dL/g and a difference in intrinsic viscosity between a central portion and a surface layer portion of the pellet is not more than 0.10 dL/g. As preferred embodiments, there is exemplified a polybutylene terephthalate pellet having an end carboxyl concentration of 10 to 25 μeq/g, an end vinyl concentration of 0.1 to 10 μeq/g, and an solution haze of not more than 5%, when measured as a turbidity value of a solution prepared by dissolving 2.7 g of polybutylene terephthalate in 20 mL of a mixed solution containing phenol and tetrachloroethane at a weight ratio of 3:2.

The invention discloses a Zn-Al-Ti intermediate alloy comprising the following ingredients in percentage by weight: 2.94-40wt% of Al, 4-16wt% of Ti and the balance of Zn. The invention also discloses a preparation method of the intermediate alloy. After the prepared Zn-Al-Ti intermediate alloy is added into Zn-Al alloy to be refined, TiAl3-xZnx particles can directly serve as a nucleation core inthe primary alpha-Al crystal grain crystallization process in the Zn-Al alloy so as to achieve the purpose of refining the crystal grain. In addition, parts of TiAl3-xZnx particles are melted to release titanium atoms; and the primary alpha-Al crystal grain is refined by composition undercooling action. The preparation method disclosed by the invention is simple, the obtained intermediate alloy has efficient crystal grain refining action, and the alpha-Al crystal grain after Zn-Al alloy is solidified can be obviously refined.

The present invention relates to a catalyst for preparation of polyester, its preparation method, and a production method of polyester. The catalyst is prepared from a titanium compound, polyol, a phosphorus compound and a metal compound by synthetic reaction, wherein a molar ratio of the titanium compound to polyol is 1:(1-2); a weight ratio of titanium atoms in the titanium compound to phosphorus atoms in the phosphorus compound is 1:(1-10); and a molar ratio of the phosphorus atoms in the phosphorus compound to metal atoms in the metal compound is 1:(1-2), and the metal compound excludes the titanium compound. The polycondensation catalyst has high catalytic activity, and is unhydrolyzed. The produced polyester has good hue and thermal stability.