Method for preparing nanometer flaky yttrium oxide powder
A nano-flaky, yttrium oxide technology, applied in chemical instruments and methods, nanotechnology, inorganic chemistry, etc., can solve the problem that the microscopic morphology of nano-yttrium oxide powder has not been effectively controlled, and there is no commercial nano-flaky yttrium oxide. Powder sales and other issues, to achieve the effect of strong repeatability and operability, low preparation cost, and low reaction pressure
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[0024] Example 1
[0025] Prepare a solution of yttrium nitrate with a concentration of 0.20mol / L, add dropwise an aqueous ammonia solution with a content of 25%, and adjust the pH value of the yttrium salt solution to 7. After the white gelatinous substance is formed, the suspension is transferred to a hydrothermal reactor, and the precursor is separated by centrifugation after being cooled to room temperature by hydrothermal treatment at 140° C. for 24 h. The obtained precursor is washed 4 times with deionized water and 3 times with absolute ethanol to fully remove residual acid radical ion impurities. After drying, it is calcined at 600°C for 4 hours to obtain nano-flaky yttrium oxide powder. From XRD diffraction pattern analysis, it can be seen that the powder sample is pure Y 2 O 3 Phase, no other miscellaneous phases appear as figure 1 (a) Shown. The powder sample is observed under a scanning electron microscope, and it can be seen that the microscopic appearance of the p...
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[0026] Example 2
[0027] Prepare yttrium nitrate solution with a concentration of 0.20mol / L, add dropwise 25% aqueous ammonia solution, adjust the pH to 9 to produce a white gel, and then transfer the suspension to a hydrothermal reactor at 100°C After hydrothermal treatment for 24 hours, the precursor was separated by centrifugation after cooling to room temperature. The precursor is washed 4 times with deionized water and 3 times with anhydrous ethanol to fully remove residual acid radical ion impurities. After drying, it is calcined at 600°C for 4 hours to obtain nano-flaky yttrium oxide powder. From XRD diffraction pattern analysis, it can be seen that the powder sample is pure Y 2 O 3 Phase, and no other miscellaneous phases appear as figure 1 (b). The powder sample is observed under a scanning electron microscope, and it can be seen that the microscopic appearance of the powder sample is flake-like, with a particle size of 100-200nm, a flake thickness of 10nm, a crystal ...
Example Embodiment
[0028] Example 3
[0029] The yttrium nitrate solution in Example 1 was replaced with an yttrium sulfate solution, and the implementation process was the same to obtain flake yttrium oxide powder. The obtained flake yttrium oxide powder has a particle size of 200-300 nm, a flake thickness of 10-20 nm, and a crystal grain diameter to thickness ratio of about 15-20.
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