摘要:
Hyperhalogens, a new class of highly electronegative species, are now invented. A hyperhalogen is a superhalogen-containing composition in which the electron affinity (EA) of the hyperhalogen is even larger than that of the superhalogens they are composed of. Novel production methods are provided in which highly electronegative species are produced by surrounding a central metal atom by superhalogen moieties.
摘要:
The present invention relates to a barium tetraborate compound and a barium tetraborate non-linear optical crystal, and a preparation method and use thereof, wherein the chemical formulae of the barium tetraborate compound and the non-linear optical crystal thereof are both BaB4O7, with a molecular weight of 292.58; the barium tetraborate non-linear optical crystal has a non-centrosymmetric structure, which belongs to a hexagonal system, and has a space group P65 and lattice parameters of a=6.7233(6) Å, c=18.776(4) Å, V=735.01(17) Å3, and Z=6, wherein the powder frequency-doubled effect thereof is two times that of KDP (KH2PO4), and the ultraviolet cut-off edge is lower than 170 nm. The barium tetraborate compound is synthesised by a solid-phase reaction method; the barium tetraborate non-linear optical crystal is grown by a high-temperature molten solution method; and the crystal has a moderate mechanical hardness, is easy to cut, polish and store, and is widely applicable in the non-linear optics of a double-frequency doubling generator, an upper frequency converter, a lower frequency converter or an optical parameter oscillator etc.
摘要:
A process for producing a ceramic material including providing an aqueous solution comprising at least one transition metal ion and one or more further transition metal ion and/or one or more additional ion; adding to the aqueous solution a quaternary ammonium or phosphonium hydroxide comprising at least one alkyl group containing about 8 or more carbon atoms to form a combined aqueous solution; mixing the combined aqueous solution to form a gel; transferring the formed gel to a furnace; and heating the formed gel to a temperature sufficient for a time sufficient to calcine the gel to form a solid ceramic material. The process in accordance with the present invention provides an improved ceramic material, in some embodiments of which is suitable for use in the cathode material of a lithium ion battery.
摘要:
Liquid phase suspensions of substantially monocrystalline rare-earth borate particles, the mean size thereof ranging from 100 to 400 nm, are prepared by roasting a rare earth borocarbonate or hydroxyborocarbonate at a temperature which is sufficient for forming a borate and obtaining a product whose specific surface area is equal to or greater than 3 m2/g and then wet grinding the roasted product; such borates are useful in the form of luminophors, in particular, as luminescent transparent materials.
摘要:
A method is provided for the synthesis of a mesoporous lithium transition metal compound, the method comprising the steps of (i) reacting a lithium salt with one or more transition metal salts in the presence of a surfactant, the surfactant being present in an amount sufficient to form a liquid crystal phase in the reaction mixture (ii) heating the reaction mixture so as to form a sol-gel and (iii) removing the surfactant to leave a mesoporous product. The mesoporous product can be an oxide, a phosphate, a borate or a silicate and optionally, an additional phosphate, borate or silicate reagent can be added at step (i). The reaction mixture can comprise an optional chelating agent and preferably, the reaction conditions at steps (i) and (ii) are controlled so as to prevent destabilisation of the liquid crystal phase. The invention is particularly suitable for producing mesoporous lithium cobalt oxide and lithium iron phosphate. The method can be used to synthesise mesoporous lithium cobalt oxide having a specific surface area in excess of 10 m2/g, preferably 15 m2/g or more.
摘要:
Novel nonlinear optical materials are described having the general formula 5MxM′yScz(BO3)4 where M and M′ are metals, typically rare earth metals, and the sum of x, y, and z is about four. One example of such a material is La0.7Y0.3SC3(BO3)4. Exemplary crystalline materials according to the general formula exhibit useful optical characteristics and desirable physical properties for nonlinear optical applications. Novel compositions and devices using the nonlinear optical materials also are described.
摘要翻译:描述了具有以下通式的新型非线性光学材料:具有通式5 M x S(z 3) 其中M和M'是金属,通常是稀土金属,x,y和z之和约为4。 这种材料的一个例子是La 0.7 O 3(3/4)4(3) / SUB>。 根据通式的典型结晶材料对于非线性光学应用显示出有用的光学特性和期望的物理性质。 还描述了使用非线性光学材料的新型组合物和装置。
摘要:
A family of borate compounds containing an isolated (finite) nonaborate anion with the structural formula [B9O12(OH)6]3−. Preferred amine nonaborate compounds have a resolved oxide formula of A2O.3B2O3.2H2O, where A is the monovalent cation of an amine salt, such as guanidinium and imidazolium. Also provided is a method for preparing these compounds by crystallization from an aqueous solution under mild conditions without the formation of significant amounts of by-products. These compounds have potential application as precursors for the production of advanced boron nitride ceramic materials, and as flame retardants, corrosion inhibitors, and biocides.
摘要翻译:一种硼酸盐化合物,其含有具有结构式[B 9] 12(OH)6]的分离(有限)非硼酸阴离子 > 3 - SUP>。 优选的胺非硼酸化合物具有分解的氧化物分子式为A 2 O 3 B 2 O 3 N 2 O 2 B 2 O 2 其中A是胺盐的一价阳离子,例如胍和咪唑鎓。 还提供了一种通过在温和条件下从水溶液中结晶而制备这些化合物而不形成大量副产物的方法。 这些化合物可用作生产先进的氮化硼陶瓷材料以及作为阻燃剂,腐蚀抑制剂和杀生物剂的前体。
摘要:
A process for the production of calcium borate from boric acid; boric acid, obtained from any source, is reacted with a calcium compound, preferably calcium hydroxide, in an aqueous medium to obtain a suspension of solid calcium borate which is then separated from the residual liquor. Preferably the boric acid is prepared from minerals containing borate salts, in particular, colemanite and howlite; wherein said minerals are ground, reacted with sulfuric acid in an aqueous medium, at high temperature, to obtain a pulp of solids, including mainly gypsum and clay, in a liquor; said solids are eliminated from the liquor and boric acid is crystallized.
摘要:
An improved method for a single step firing synthesis of borate phosphors wherein at least about half the amount of a volatile, low melting point, boron source such as boric acid or boron oxide is replaced with an equivalent amount of boron nitride. The method having the advantages of a single step firing and providing better control over the stoichiometry of the phosphor.