108results about How to "Limitation of scope of protection" patented technology

The invention relates to a preparation method of an iron-based Fischer-Tropsch synthetic catalyst for a fluid bed, which mainly solves the problem that the catalyst preparation process is complicated in the prior art. The preparation method comprises the following steps: mixing a soluble iron salt solution with a soluble salt solution of A, uniformly mixing with a sol solution of a carrier C, adding a soluble salt or oxyhydroxide solution of B, beating, simultaneously adding an amount of acid and alkali regulator to regulate the pH value of the slurry so as to obtain an appropriate catalyst slurry; and then carrying out spray drying, and calcining to obtain the iron-based Fischer-Tropsch synthetic catalyst for the fluid bed, wherein A is at least one of Mn or Cu, B is one of alkali metals, and C is at least one of SiO2 and Al2O3. The technical scheme well solves the problem and can be used for the industrial preparation of the iron-based Fischer-Tropsch synthetic catalyst for the fluid bed.

The invention relates to a method for preparing a load N-doped nano TiO2 visible light photocatalyst by using natural porous mineral attapulgite as a carrier, belonging to the technical field of mineral material processing and photocatalysis. The method comprises the following steps of: adding water and hydrochloric acid to calcined and purified attapulgite mineral powder, stirring and pulping the attapulgite mineral powder, and then adding a TiCl4 solution and a (NH4)2SO4 solution; adding an ammonia water solution to regulate pH and carrying out hydrolyzing and precipitating load and N-doped reaction by using NH4+ as a nitrogen source; and filtering, washing, drying and calcining a reaction product to obtain the nitrogen-doped attapulgite load nano TiO2 visible light photocatalyst. The prepared N-doped attapulgite load nano TiO2 visible light photocatalyst reduces the forbidden band width of TiO2 to below 2.8 eV from 3.0-3.2 eV and can obviously improve the photocatalysis performance of the nano TiO2 under visible light; and the degradation rate of the catalyst for formaldehyde within 8 h under the visible light reaches above 90%.

The invention discloses a preparation method of a nanoparticle-modified polyurethane acrylate copolymer resin microemulsion. The method comprises the following main steps: mixing dehydrated polyalcohol, polyisocyanate monomer, hydrophobic nanoparticles, hydroxy acrylate, acrylate monomer, a co-stabilizer and a catalyst to form an oil phase; dissolving a surfactant and an initiator in deionized water, and mixing to form a water phase; and proportionally mixing the oil phase and water phase, carrying out ultrasonic dispersion, and carrying out microemulsion polymerization. The microemulsion polymerization process is utilized to copolymerize the polyurethane and acrylic resin, and the nanoparticles are introduced to obtain the nanoparticle-modified polyurethane acrylate copolymer resin microemulsion. The emulsion has the advantages of high solid content, small particle size, high storage stability and high coating glossiness, can form a compact film material, and can be used in the fields of high-grade coating protection, corrosion-resistant coatings, infrared stealth coatings, wave-absorbing materials, complex top finishing and the like.

A kind of preparation method of microspherical Fischer-Tropsch synthesis catalyst, mix ferric nitrate or ferric sulfate solution with lanthanum nitrate and copper nitrate or copper sulfate mixed solution, then add precipitating agent sodium carbonate or ammonia solution, the obtained iron-containing lanthanum copper After the precipitation slurry is washed and filtered to obtain a co-precipitation filter cake, the potassium silicate water glass solution is directly added to the wet slurry containing iron, lanthanum and copper, and the slurry is beaten and mixed evenly to obtain a catalyst slurry, which is then spray-dried and roasted to obtain a catalyst slurry. Spherical slurry bed Fischer-Tropsch synthesis iron-based catalyst. The invention simplifies the technological process, and the spray drying method has the characteristics of large processing capacity, low energy consumption, rapid catalyst formation, suitable for industrial continuous large-scale production and the like.

The invention discloses a small molecule quaternary phosphonium salt type N-halamine antibacterial agent and a preparation method thereof. The antibacterial agent is prepared by integrating a quaternary phosphonium salt group and a N-halamine group into a single molecule by chemical covalent bond, solves the problem of poor hydrophily of N-halamine molecules, and retains the respective advantages of two antibacterial agents including N-halamine and quaternary phosphonium salt unit respectively, the antibacterial agent is good in sterilization effect, cost is low, technological process is simple, and the small molecule quaternary phosphonium salt type N-halamine antibacterial agent is suitable for medical treatment and public health, food safety, environmental protection, and many other fields.

The invention provides a preparation method of a nanocellulose composite polysulfone hollow fiber membrane. The preparation method comprises the steps that a membrane casting solution and a core solution are extruded through an annular spinning head of an immersion precipitated phase inversion spinning device at the same time to form a tubular liquid membrane, wherein the membrane casting solution comprises polysulfone, nanocellulose, polyethylene glycol and sulfonated polysulfone; the tubular liquid membrane passes through an air gap to enter a coagulating bath to be solidified, the tubular liquid membrane is placed in water to be soaked and cleaned, and the nanocellulose composite polysulfone hollow fiber membrane is obtained. The nanocellulose is used as a reinforcing agent and a hydrophilic modifying agent, and the mechanical strength and hydrophilism of the polysulfone membrane are improved; the polyethylene glycol is used as a dispersing agent for the nanocellulose and a hydrophilic modifying agent for the polysulfone membrane, the compatibility between the nanocellulose and polysulfone and the hydrophilism of the polysulfone membrane are improved, and therefore the prepared nanocellulose composite polysulfone hollow fiber membrane has the advantages of being high in strength and good in hydrophilism. In addition, the preparation method is simple in technology.

The invention provides a foliar fertilizer. The foliar fertilizer comprises nutrient balance factors, stress-tolerant factors, immunoregulation factors and plant growth regulation factors, wherein the nutrient balance factors comprise amino acids and carbohydrates; the stress-tolerant factors comprise salicylic acids and vitamins; the immunoregulation factors are one or more of carapace, chitosan and chitooligosaccharide. The foliar fertilizer provided by the invention can be applied to leaf surfaces of crops, and can be directly absorbed via air holes in the leaves of the crops to take an effect; the foliar fertilizer can be also applied to the leaves, fruits and whole plants of the crops, and can be absorbed via air holes in the leaves of the crops to take an effect. Experimental results show that the foliar fertilizer provided by the invention can substantially increase the yield of the crops and improve the quality of the crops.

A reduction process for Fischer-Tropsch synthesis of iron-base catalyst in slurry bed includes adding liquid-phase hydrocarbon medium and catalyst to slury-bed reactor, displacing air, programmed heating, reducing catalyst by H2 and then by CO, and Fischer-Tropsch synthesis.

The invention provides a preparation method of a graphite oxide acetylene nanosheet achieving water photolysis oxygen generation under visible light. The method for preparing the graphite oxide acetylene nanosheet is simple, efficient and low in cost. The prepared graphite oxide acetylene nanosheet has abundant oxygen-containing functional groups on the surface and excellent dispersion in water, and is beneficial to improvement of light absorption; the graphite oxide acetylene nanosheet has the uniform size and ultra-thin thickness, and is beneficial to separation and transmission of photo-induced electrons and holes, and the performance of water pohotolysis oxygen generation under the visible light is improved. The prepared graphite oxide acetylene nanosheet material has good absorption in the visible light range, and the energy band structure meets the requirement of catalyzing water for decomposition to generate oxygen under visible light irradiation, and thus high-performance visible light water pohotolysis oxygen generation is achieved. In addition, the graphite oxide acetylene nanosheet material still show the excellent water pohotolysis oxygen generation performance under irradiation of near-infrared light (lambda=660 nm).

The invention provides light-cured organic silicon resin. The light-cured organic silicon resin is prepared by performing cohydrolysis-polycondensation reaction on at least one of siloxane containingalkyl and siloxane containing aryl as well as siloxane containing epoxy group and siloxane containing unsaturated double bond under the action of a catalyst. Epoxy functional group and unsaturated double bond group in the light-cured organic silicon resin, serving as special functional groups, improve the curing property of organic silicon resin, improve the curing rate, reduce molding volume shrinking percentage and warping degree, and have important application in the fields of aviation, electronic engineering, light industry, mechanical engineering, chemical engineering and medicine.

The invention provides a nanometer titanium dioxide preparation method. Ammonium hexafluorotitanate doped with the following nonmetal elements: N, F and B enhances the photocatalysis effect of nanometer titanium dioxide under the action of boric acid; a silver nitrate solution added in the invention is doped with the metal element Ag, and the metal element Ag and the nonmetal elements are co-doped to generate synergism, so the catalysis activity of nanometer titanium dioxide is greatly improved. Butyl titanate is hydrolyzed to generate a nanometer titanium dioxide sol, and a titanate coupling agent and polystyrene are directly used to modify the nanometer titanium dioxide sol, so the method has the advantages of simple process and mild reaction conditions; and the nanometer titanium dioxide modified by the titanate coupling agent and polystyrene has good thermal stability and dispersibility.

A molecular marker primer for identifying Shao's Sillago and Sillago sihama belongs to the technical field of biology, and sequences of the primer include L5979: 5'-TTTAGTATTCGGAGCCTGAG-3' and H6241: 5'-CCTCAACACCTGATGAGGCC-3'. The invention also provides a method for identifying Shao's Sillago and Sillago sihama by using the primer, comprising the steps of extracting DNA from Shao's Sillago and Sillago sihama, using DNAs of the two species as templates to perform PCR (polymerase chain reaction) amplification, purifying and sequencing amplification results, and comparing sequencing results to determine that intraspecific genetic difference is not greater than 1%; molecular marker sequence of Shao's Sillago is SEQ NO. 3 and molecular marker sequence of Sillago sihama is SEQ NO. 4; the method of the invention helps solve the problem of germplasm mixing of Sillago fishes, and is simple to perform, easy to master and high in accuracy.

The invention provides a transparent polyimide film, which is prepared from a diamine compound and a dianhydride compound containing an imide structure and an alicyclic structure at the same time, wherein the dianhydride compound with the structure has the plane characteristic of a bisimide structure so as to improve the stacking density of a molecular chain is improved and reduce the thermal expansion coefficient, the dianhydride monomer has very high reaction activity so as to obtain high-molecular-weight polyimide to make the transparent film have very good mechanical properties, and particularly due to the introduction of the aryl structure, the heat resistance of the polyimide is also improved. The film provided by the invention has the advantages of high strength, low thermal expansion coefficient, heat resistance and enough transparency.

The invention discloses a sodium alginate microballoon vein suppository containing hemangioma-resisting medicant, a preparation method and an application thereof. The sodium alginate microballoon vein suppository comprises carrier sodium alginate and hemangioma-resisting medicant; the sodium alginate covers the hemangioma-resisting medicant; the weight ratio of the sodium alginate to the hemangioma-resisting medicant is 5:1-60:1; and the hemangioma-resisting medicant is pingyangmycin, sodium morrhuate, carbamide or bleocin. The raw materials used in the invention have favorable mechanical strength, biocompatibility, biological degradability and stability, have no organic solvent, and are basically harmless to functions of hemopoietic system and immune system, thereby suppository can be industrially produced.

The invention provides a black light shielding adhesive tape and a preparation method thereof. The black light shielding adhesive tape consists of a PET (Polyethylene Terephthalate) base layer, an inklayer, a first adhesive layer, a second adhesive layer and a protection layer. The black light shielding adhesive tape is simple in preparation process, easy to operate and applicable to industrial production; secondly, the ink layer is made of environmental-friendly aqueous black ink, a nano Al / Al2O3 core-shell material light absorbent is capable of effectively absorbing light fed into the ink layer, a screen display effect can be effectively improved, and the problem that the edge of a screen is bright while a backlight source is fed into the screen from a transparent adhesive layer can besolved. Therefore, the black light shielding adhesive tape provided by the invention has the characteristics of being long in service life, environmentally friendly, good in adhesion, good in light shielding property, easy to repair and good in high temperature resistance; in addition, the first adhesive layer optimally comprises nano silicon dioxide, so that the adhesive tape has a convex-concavesurface and has a small contact area with a display panel, the display panel is not damaged or a backlight module is disassembled when being dismounted, convenience in dismounting can be achieved, and high rework efficiency can be achieved.

The invention provides albumin hydrogel. The albumin hydrogel is prepared by mixing albumin, a cross-linking agent and a solvent, the cross-linking agent comprises a repeating unit having a structureof formula (I) and an end group having a structure of formula (II). The invention develops the albumin hydrogel which is rapid in crosslinking, low in gelatinization concentrating and free of biotoxicity, and the albumin hydrogel is applied to the fields of cell culture, tissue engineering and drug delivery. Besides, as a good paclitaxel topical treatment drug carrier, the albumin hydrogel overcomes the defect of poor paclitaxel solubility, polyoxyethylene castor oil with biotoxicity is not introduced, and compared with a systemic preparation, the albumin hydrogel has the advantages that the administration frequency is effectively reduced, the drug concentration at a tumor is increased, and the systemic toxicity is reduced. Nanoparticles wrapping paclitaxel are used as gel forming components of the gel, so that uniform distribution of the paclitaxel in the gel can be realized, and stable and continuous release is realized.

The invention provides a preparation method of degradable polyolefin, which has the advantages of a controllable number of degradation units and a high monomer utilization ratio, and comprises the following steps of dissolving cycloketene acetal, a radical initiator and a chain transfer reagent in a solvent, and reacting with olefin or olefin derivatives to obtain the degradable polyolefin material. Cycloketene acetal and polyolefin are copolymerized in a random manner through RAFT polymerization of cycloketene acetal and olefin, and ester bonds are introduced to all polyolefin carbon skeletons. The number of degradable units (ester bonds) introduced in the mode is controllable, the monomer utilization rate is high, the production cost can be effectively reduced, and degradation of polyolefin is controlled.

The invention discloses a sodium alginate targeted sustained release microsphere vascular occlusive agent containing Sorafenib as well as a preparation and application thereof. The invention is characterized by comprising carrier sodium alginate and antitumor targeted drug Sorafenib; the sodium alginate wraps the Sorafenib; the Sorafenib is 1 portion by weight and the sodium alginate is 1 to 30 portions by weight. The vascular occlusive agent leads the oral targeted drug to achieve the purpose of interventional embolotherapy by an interventional embolotherapy method for changing preparation formulation and changing the drug administration way, simultaneously leads Sorafenib of the antitumor drug to be directly located to cancer tissues in a fast and long-acting manner from local target areas, has strong pointedness and obvious effect, does not damage normal tissues while cutting blood supply of tumor and inhibiting growth of the tumor cells, has high drug concentration in local target areas and little drug amount for the whole body, better and effectively protects the self immune system of patients and reduces toxic and side effects and the like.

The invention relates to a method for preparing a fluidized bed cobalt-based Fisher-Tropsch synthesis catalyst, which mainly solves the problem of complex catalyst preparation process in the prior art. For solving the problem, the invention adopts the technical scheme that: in the catalyst, Co is used as a main active ingredient, alkali metal and rare-earth metal La or Ce are used as cocatalysts,and a mixture of SiO2 or Al2O3 and ZrO2 is used as a carrier; and the method comprises the following steps of: mixing salt solution of the main catalyst and the cocatalysts and the sol solution of the carrier to obtain catalyst slurry containing 10 to 50 weight percent of solid, adjusting the pH value of the slurry to between 0.1 and 7 by using acid or alkali, performing spray drying molding on the slurry, and baking the molded product to obtain the catalyst. The method is applied in industrial preparation of the fluidized bed cobalt-based Fisher-Tropsch synthesis catalyst.

The invention provides a preparation method of a lamellar ZSM-5 catalyst. Under the action of double template agents, a lamellar ZSM-5 molecular sieve is controllably synthesized by utilizing a function of each template agent. The two template agents have the respective functions: the template agent A is used for synthesizing a lamellar ultrathin molecular sieve, and the template agent B is used for growing the conventional ZSM-5 molecular sieve on the basis of the lamellar molecular sieve. The molecular sieve is characterized by being capable of adjusting and controlling the layer thickness and the Si / Al molar ratio of the lamella ZSM-5 catalyst through controlling the compositional ratio of various raw materials in a precursor solution; the synthesized molecular catalyst has high aromatic hydrocarbon selectivity and carbon deposition resistance on a B acid site, and has high catalytic stability.

The invention provides a method for producing an aromatic hydrocarbon solvent having wide distilling range, low chromaticity and high boiling point. The production method of the aromatic hydrocarbon solvent having wide distilling range, low chromaticity and high boiling point of the invention includes the steps of guiding a C9+ fraction raw material into a first rectification column for rectifyingand removing a light component, then separating a first solvent product from a second solvent crude product through a second rectification column, and finally separating a second solvent product froma colored heavy component by a third rectification column; meanwhile, precisely controlling the rectification operating pressure, temperature and reflux ratio of each distillation column, which can greatly widen the distilling range of a first aromatic hydrocarbon solvent obtained, and can also effectively ensure the chromaticity of a second aromatic hydrocarbon solvent; each step performed is arectification step, no waste is discharged, and the process is environmentally friendly and non-polluting.

The invention relates to a method for manufacturing a die of a compressor impeller of a turbocharger, which mainly comprises the following steps: firstly, a data model of the compressor impeller is designed: a computer three-dimensional data model of the compressor impeller of the turbocharger is designed through pro / engineer computer software; secondly, an impeller physical model is made by a digital control processing center: on a five-shaft digital control milling machine, an integrated impeller physical model is processed by metal materials, such as aluminum ally, and the like that are soluble in acid easily; thirdly, a metal layer is cast on the outer surface of the impeller physical model: an even nickel or copper layer with 2-7mm is cast on the outer surface of the impeller physical model by adopting an electroforming method; fourthly, the acid dissolution is carried out: the metal impeller physical model is molten by acid solution. The die of the compressor impeller of the turbocharger made through adopting the steps can be used for casting the compressor impeller of the rubber turbocharger.

The invention provides a preparation method of a carbon nanotube. The method comprises the following steps of: A) mixing an aqueous solution of metal acetate with a nitrogen-containing organic matter,and performing heating for dissolving to obtain a mixed solution; wherein the metal acetate is selected from Ni(CH3COO)2 or Co(CH3COO)2, and the nitrogen-containing organic matter is selected from dicyandiamide, melamine or urea; B) heating the mixed solution until the solvent is volatilized to obtain initial raw material solid powder; and C) under a protective atmosphere condition, carrying outstaged heating calcination on the initial raw material solid powder to obtain the carbon nanotube. According to the method, cheap chemical raw materials are used as the initiator, the nitrogen-doped carbon nanotube is directly prepared through a high-temperature pyrolysis method, and the cost can be reduced. The nitrogen doping effectively enhances the conductivity of the carbon tube and reduces the internal resistance value of the battery, and the carbon nanotube material shows higher specific capacity and better cycle performance than a traditional lithium battery negative electrode carbon material under the condition of high-rate charging and discharging.

The invention discloses a method for improving anti-caking property of phosphorus-potassium nitrate fertilizer and belongs to the technical field of chemical fertilizer preparation. The method comprises the following steps: (1) sieving ammonium nitrate phosphate (ANP) by carrying out a briquetting experiment; (2) sieving the ANP by carrying out a bag throwing experiment; (3) adding granular or powdery ammonium nitrate phosphate according with the steps (1) and (2) at the same time and potassium sulfate or potassium chloride into a rotary drum granulator by virtue of a metering system, so that a solid-phase material is obtained; (4) fully mixing liquid raw materials, namely sulfuric acid, phosphorus pentoxide and liquid ammonia, in a tubular reactor, so that a liquid phase material is obtained, and spraying into the solid material in the step (3), and (5) drying, screening, cooling and packaging, so that a nitryl high-concentration granular compound fertilizer is obtained. The method disclosed by the invention has the characteristics that the raw materials are screened, the ANP with better anti-caking property is selected and used for producing high-nitrogen fertilizer, cost is not increased, equipment does not need to be added during implementation and the original production technology cannot be changed, and the aim of improving the anti-caking property of the compound fertilizer can be achieved by only controlling mass of the ANP.

The invention provides a non-toxic marine ship antifouling coating material, which is prepared from the following raw materials in parts by mass: 100 parts of organic silicon resin, 1 to 3 parts of achitosan quaternary ammonium salt, 5 to 10 parts of fly ash nanoparticles, 0.5 to 1 part of a coupling agent, 3-5 parts of a curing agent, 0.01 to 0.1 part of a catalyst, 0.2 to 0.5 part of an antifoaming agent, and 0.2 to 0.5 part of a leveling agent. According to the invention, organic silicon resin is used as a matrix, nano fly ash is used as a carrier, and a chitosan quaternary ammonium salt loaded on the surface is used as a main antifouling agent, wherein the chitosan quaternary ammonium salt has good solubility and antibacterial property, has biocompatibility, and is safe and non-toxic,the fly ash nanoparticles have strong alkalinity, and the organic silicon is also a low surface energy material; by using a hydrophilic chitosan quaternary ammonium salt as a main antibacterial material, so that the use of a large amount of organic solvents is avoided, the cost is low, and less waste liquid is generated; and fly ash nanoparticles are activated to promote the self-polymerization of organic silicon resin molecules to form a layered structure with certain orientation so as to enhance the strength and elastic modulus of the coating material.

The invention provides a mobile phone protection film preparation method. A mobile phone protection film is prepared by the steps of melting and extruding a polyester base material and functional master batch, curtain coating and casting pieces, stretching and shaping, performing thermal treatment and tailoring. The mobile phone protection film preparation method has the advantages of simple preparation technology, easiness in operation and suitability for industrial production. Graphene and modified zinc oxide are coated by polyaniline, so that dispersity of the graphene and the modified zincoxide is effectively improved, the compatibility of the graphene and the modified zinc oxide with a polyester matrix is enhanced, the combination area of the graphene and the modified zinc oxide withthe polyester matrix is enlarged, the graphene and the modified zinc oxide are cooperated with the polyaniline to further improve an antistatic effect of the mobile phone protection film. In addition, the modified zinc oxide and the graphene have a synergistic effect and are added into a polyester system to form a stress concentration point, so that cracks generated on the matrix can be preventedfrom expanding and can be passivated; finally, the cracks are terminated and are prevented from generating destructive cracks, and mechanical property and wear resistance of the antistatic mobile phone protection film are improved; thus, the service life of the mobile phone protection film is prolonged.

The invention discloses a preparation method of a granular high-nitrogen nitro-compound fertilizer with high storage stability and belongs to the technical field of preparation of chemical fertilizers. The method comprises the following steps: (1) co-dissolving potassium nitrate and ammonium phosphate nitrate; (2) preparing a solid material; (3) preparing a granular material; and (4) preparing thegranular high-nitrogen nitro-compound fertilizer with high storage stability: through the processes of drying, screening, cooling and wrapping the granular material obtained in the step (3) to obtainthe granular high-nitrogen nitro-compound fertilizer with high storage stability. Through the preparation method of the granular high-nitrogen nitro-compound fertilizer with high storage stability, the formula and the process are optimized so as to improve the storage stability of the granular nitro-compound fertilizer; the effect is obvious; the method is easy to implement.

The invention provides a PET (Polyethylene Terephthalate) protection film and a preparation method thereof. The PET protection film is prepared from a PET base material layer, a low-viscous middle layer and a protection layer; the preparation process is simple and easy to operate. A 1-methyl-3-benzoyl peroxide imidazole bromine ionic liquid is used as an initiator and is the green and environmental-friendly ionic liquid, the polymerization reaction rate is controlled, and a molecular chain is further crosslinked, so that the viscosity of a low-viscosity middle layer can be effectively reduced,and high-temperature resistance is also improved; in addition, the 1-methyl-3-benzoyl peroxide imidazole bromine ionic liquid and an emulgator have a better synergistic effect, so that the stabilityof a polymer emulsion is improved, and the combination property of the PET protection film is improved. Therefore, the PET protection film prepared by the invention has the characteristics of long service life, environmental protection, good transparency, low viscosity, good high temperature resistance and excellent mechanical property.

The invention provides a 0-3 bismuth ferrite based magnetoelectric composite material shown as a formula (I), and also provides a preparation method of the 0-3 bismuth ferrite based magnetoelectric composite material. The method comprises the following steps that a bismuth source, an iron source, a barium source and a titanium source are mixed according to the relative proportion of all ingredients in the 0-3 bismuth ferrite based magnetoelectric composite material shown as the formula (I); the mixed raw materials are subjected to ball grinding and are then synthesized to obtain synthesized powder; the synthesized powder is subjected to ball grinding; then, bonding agents are added for tableting; sintering is performed to obtain the 0-3 bismuth ferrite based magnetoelectric composite material. The 0-3 bismuth ferrite based magnetoelectric composite material shown as the formula (I) is obtained by a non-stoichiometric proportioning method; the composite material can realize second phaseuniform dispersion, so that the magnetoelectric coupling performance of the composite material is excellent; the formula (I) is (1-y)Bi(1-x)FeO(3-1.5x)-yBaTiO3.