50 results about "Strontium borate" patented technology

Granules of a glass raw material mixture, for producing alkali-free glass containing substantially no alkali metal oxides, such that the glass composition of glass obtained from the granules comprises, as represented by mol % based on oxides, 60-75 mol % of SiO2, 5-15 mol % of Al2O3, 1-9 mol % of B2O3, 0-15 mol % of MgO, 0-20 mol % of CaO, 0-12 mol % of SrO and 0-21 mol % of BaO, provided that the total of CaO, SrO and BaO is more than 0, and in an X-ray diffraction spectrum of the granules obtained by means of a CuKα ray, when the diffraction peak area of quartz (100) in a range of 2θ being 19.85-21.71 degrees is taken as 1, the total of the relative values of the diffraction peak areas of strontium borate hydrate, calcium borate hydrate and barium borate hydrate, is at least 0.005.

The invention discloses a method for preparing samarium-doped strontium borate by taking analytically pure diboron trioxide, strontium carbonate and samarium oxalate decahydrate as raw materials and combining precursor preparation under normal pressure and high pressure and a high temperature and high pressure solid phase reaction. The method comprises the following steps: pressing mixture powderto be cylindrical by using a tablet press; respectively pressing zirconia powder and sodium oxalate powder into a pair of wafers by using the tablet press; staking and filling the prepared wafers intoa platinum tube to be sealed in a sandwich form, completing high-pressure assembling, and carrying out the high temperature and high pressure reaction by a large cubic press, thereby obtaining the samarium-doped strontium borate sample. The technical problems in the prior art that synthesis conditions are difficultly controlled in the process of taking strontium carbonate, boric acid and samariumsesquioxide as raw materials and synthesizing the samarium-doped strontium borate by using a high-temperature solid-phase reaction method, a hydrothermal synthesis method and the like and the synthesized samarium-doped strontium borate is low in purity, poor in crystallinity, low in granularity, small in samarium doping amount and low in luminous efficiency and the like are solved.

The invention discloses a Dy 3+ Activation of strontium barium fluoroborate yellow fluorescent powder and its preparation and application, the general chemical formula of the fluorescent powder is Ba 3‑x Dy x Sr 2 B 4 o 10 f 2 , x is Dy 3+ Replace Ba 2+ The molar ratio of 0.005≤x≤0.35; the preparation steps are: (1) using the chemical sol-gel method to prepare the fluorine-free strontium barium borate precursor powder Ba 2‑ x Dy x Sr 2 B 4 o 10 (2) In the prepared fluorine-free strontium barium borate precursor powder, add barium fluoride and ammonium fluoride, fully mix, and mix the mixture, use solid-state sintering method to prepare, obtain a Dy 3+ Activate strontium fluoroborate barium yellow luminescent phosphor Ba 3‑ x Dy x Sr 2 B 4 o 10 f 2 . The yellow fluorescent powder prepared by the present invention is a pure phase with uniform particles, and emits yellow light with a center wavelength of 576 nm under the excitation of near-ultraviolet light at 390 nm. It has high luminous intensity and good thermal stability, and can be used to prepare near-ultraviolet light as an excitation light source. lighting or display devices.

The invention discloses a polymethyl methacrylate (PMMA) compound bone cement precursor which comprises solid phase powder and solidification liquid, wherein the solid phase powder comprises strontium borate bioglass, polymethyl methacrylate powder and a polymerization initiator, the solidification liquid comprises methyl methacrylate and a polymerization activator, and the mass of the solid phase powder is 50 to 80 percent of the mass sum of the solid phase powder and the solidification liquid. The invention also provides a preparation method of polymethyl methacrylate compound bone cement, the compound bone cement combines the performance of the strontium borate bioglass and pure PMMA bone cement, has excellent biological activity, biological degradability, biological compatibility as well as mechanical strength matched with bones, so as to achieve a good effect on prompting bone reconstruction; the invention also provides an application of the strontium borate bioglass / polymethyl methacrylate compound bone cement.

The invention provides a simple preparation method of a SmBO3 nanowire. The method is mianly characterized by preparing the nanowire SmBO3 by use of borax and Sm(NO3)3 as raw materials and hydrothermal process under the condition of adding a sodium oleate modifier. The main principle is as follows: an anionic surfactant sodium oleate can form a certain coordination with the Sm<3+> ion in the Sm(NO3)3 solution in the hydrothermal process, thereby forming the nano samarium oxide; under the protection effect of the sodium oleate and along the prolonging of the reaction time, the samarium oxide is reacted with the borate in the solution to generate the SmBO3 nanowire. The method provided by the invention is characterized in that: the obtained SmBO3 nanowire has multiple strong absorption peaks in the infrared area, particularly, the absorption at the 1064cm<-1> wavelength is the strongest, and can be used as a wave-absorbing material.

The invention discloses a near-infrared luminescent bismuth doped strontium chloro-pentaborate crystal and a preparation method thereof. The general formula of the crystal is Sr2(1-x)B5O9Cl : 2xBi, 0.1% <= x <= 3.0%. respectively weighing strontium containing, boron containing, chlorine containing and bismuth containing compounds as raw materials; preforming pre-burning at 623-823 K for 3-6 hoursafter the raw materials are uniformly ground, performing cooling to room temperature, and performing grinding and well mixing; and performing calcining at 1,073-1,173 K for 4-6 hours, performing reaction for 15 min - 10 hours under a reducing atmosphere of 1,073-1,173 K on an obtained sample after performing cooling to the room temperature, and performing grinding to obtain the crystal after performing cooling to the room temperature. The near-infrared fluorescence full width at half maximum is greater than 200 nm and wider than the luminescence of rare earth ions, and has longer fluorescencelifetime, so that the crystal can be taken as a laser gain medium and applied to the fields of ultra-wideband wavelength tunable novel laser sources or ultrashort pulse lasers.