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Infrared lamp the dry NH4VO3 and Y2O3, moisture is removed. Accurate according to the stoichiometry of the reaction, said the take NH4VO3 and Y2O3. Y2O3 dissolved in dilute nitric acid for the right amount of close to 100 ° C can be obtained Y (NO3) 3 solution to control its concentration is about 0.1 to 0.5mol / l. Will NH4VO3 dissolved in an appropriate amount of distilled water in close to 100 ° C, similar to the concentration of Y (NO3) 3 solution concentration, vacuum filtered, then filtrate is heated to near 100 ° C. At the proper temperature while stirring the edge by adding to the the filtered NH4VO3 solution Y (NO3) 3 solution, 1:3 ammonia to adjust the solution pH ≈ 7.0, with constant stirring to generate a large amount of precipitation. It is the detailed classification of green laser pointer.
After the reaction, adding an appropriate amount of boiling water in order to maintain the temperature, continue to control the appropriate pH value and stirring 2 mix 1h, making the reaction is complete. Sediments will settle overnight, isolated by decantation, washed precipitate, add distilled water, stir and put it aside for settlement. Decantation separation precipitation, and centrifugal dewatering. Served in the rest of the YVO4 precipitation corundum cup, placed in a muffle furnace at the appropriate temperature sintering 6 ~ 8h growth YVO4 crystal polycrystalline powder materials. The experimental phenomenon: while stirring the edge by adding to the the filtered NH4VO3 solution Y (NO3) 3 solution, a yellow precipitate generated gradually become milky white color as NH4VO3 solution precipitation. green laser pointer has a great and wide use and application in the practical use.
Aside after stratification, the upper supernatant, the lower milky white precipitate. Milky white crystal after sintering, the particles than the solid large. Test Results and discussion: vanadate under different pH values easy Parties synthesis of different vanadate [1]. Preparation of the key is to prevent the formation of multi-vanadate. > 8:00, VO4 condensation V4O12 under acidic conditions, pH <6, VO4 of pH was destroyed, generate V2O5 precipitation, in order to effectively prevent the occurrence of these two types of side effects, should be near neutral weak alkaline conditions, controlled at about 7.0 when the pH of the reaction end, the loose precipitate, after aging difficult to centrifuge. An appropriate increase in pH allows precipitation is easily separated, and the weak alkaline conditions to prevent the formation of the colloid. Also, there are various options of green laser pointer for the customers to choose.
Solid-phase synthesis of nonlinear optical crystal INTO Ca3 a-xLa2x / 3 (VO4) 2 polycrystalline materials, the experimental principle: Ca3 (VO4) 2 crystal belongs to trigonal system, R3cH space group, with the second-order nonlinear effects. La [2] 3 + and other rare earth ion incorporation to the formation of Ca3-xLa2x / 3 (VO4) 2 compounds, the crystal second-order nonlinear coefficient larger enhancements. Take solid phase synthesis, starting materials La2O3, CaCO3, and NH4VO3 sintered at high temperature the reaction can be directly Preparation Series INTO Ca3 a-xLa2x / 3 (VO4) 2 crystal growth materials. Stoichiometric weighing drugs fully in the agate grinding grinding and mix well. So, how to choose the best and most suitable green laser pointer.
Tablet compaction, placed in a muffle furnace sintering reaction is as follows: the x Effect of La2O3 + (3-x) CaCO3 the +2 NH4VO3 = INTO Ca3 the-xLa2x / 3 (VO4) 2 + (3-x), of CO2 + H2O + 2NH3. ↑ 3 2, the experimental steps: take the synthesis of solid phase synthesis 5g x 0,1 / 7,3 / 7,0.5 and 1 INTO Ca3 a-xLa2x / 3 (VO4) 2 polycrystalline compounds. Stoichiometric ratios were weighing in La2O3, CaCO3, and NH4VO3 raw materials, grinding, placed in an agate mortar for full tablet. Take appropriate mixture to do differential thermal - thermal gravimetric analysis, based on the differential thermal - thermal gravimetric analysis to determine the sintering process of the mixture. Tablet placed Maffay furnace sintering. In order to completely, should be sintered samples re-grinding, tabletting, sintering the mixture reaction. 33 Results and discussion: Weigh the quality of medicines in the table below. green laser pointer is super high in quality, strict and accurate in parameter, high and perfect in performance and high in cost performance with less money.