A kind of synthetic method of samarium cobaltate nano powder
A synthesis method and nano-powder technology, applied in nanotechnology, cobalt compounds, nanotechnology and other directions, can solve the problems of poor product uniformity, high sintering temperature, and many product impurities, and achieve low cost, lower reaction temperature, The effect of fine product particles
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Embodiment 1
[0026] Weigh samarium acetate (3.256g) and cobalt chloride hexahydrate (1.785g) according to the molar ratio of 1:1, then stir on a heating type stirrer at 70°C for 10min, take 4g of sodium hydroxide and dissolve it in water, and Pour the dissolved samarium acetate and cobalt chloride hexahydrate solution into the sodium hydroxide solution, and keep stirring to ensure that the pH of the solution is above 12 (there is no pH meter in the laboratory, and the test paper turns black when measured with pH test paper). Let the solution stand still for a period of time, if the solution is found to be stratified, the upper layer is a colorless liquid, and the lower layer is solid small particles, then go to the next step, otherwise add sodium hydroxide again, stir, and repeat this operation. The solution was vacuum-filtered with a water pump, washed, put into a crucible, dried in an oven at 120°C for 2 hours, and then ground. After grinding, the powder is heated to 500°C, 700°C, 900°C,...
Embodiment 2
[0028] SmCl 3 and CoCl 3 ·6H 2 O is weighed according to the ratio of 1:1 in molar ratio, put into ammonia water, after heating and stirring for 30min, the solution is left to stand still for a period of time, if it is found that the solution is stratified, the upper strata is a colorless liquid, and the lower stratum is a solid small particle, then enters the next step, Otherwise, add ammonia water again, stir, and repeat this operation. The solution was filtered with a water pump vacuum, washed, put into a crucible and heated with a furnace. Heat up to 700°C, keep the temperature for 5 hours, and cool down with the furnace. figure 2 It is the SEM spectrum of the pre-calcined powder at 700°C, which shows that when the sample is fired at 700°C, a high-purity samarium cobaltate powder is formed. SEM showed that the product was a dendritic structure with a diameter of about 200nm and uniform particles.
Embodiment 3
[0030] Weigh samarium acetate (6.512g) and cobalt chloride hexahydrate (3.57g) according to the molar ratio of 1:1, then stir for 30min at 50°C on a heating type stirrer, take 10g of sodium hydroxide and dissolve it in water, and The dissolved samarium acetate and cobalt chloride hexahydrate solutions are poured into the sodium hydroxide solution and continuously stirred to ensure that the pH of the solution is above 12. The solution was left to stand for a period of time, and the solution was evacuated by a water pump to filter, washed, put into a crucible and dried in an oven at 120° C. for 2 hours, and then ground. After grinding, the powder is heated to 500°C, 700°C, 900°C, the heating time is one hour, the holding time is 3 hours, and the pure samarium cobaltate solid can be obtained by cooling with the furnace. image 3 It is the electrical conductivity spectrum of the product powder at different temperatures, indicating that the sample can be calcined at a higher temper...
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