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由金属镁粉和钴粉,在350—500℃,15—50巴氢压下,制备了新的三元金属氢化物Mg_2CoH_5。 X粉末衍射证实,在400℃以下得到的氢化物为四方结构,其晶胞参数为a=4.4863,c=6.154在高于425℃时得到的氢化物为六方结构,其a=4.6754,c=10.0907。同时还测得了它的吸放氢速度,根据压力组成等温线的测定,求得了分解热焓。比表面、导电、催化性能也进行了测定。
A new ternary metal hydride, Mg_2CoH_5, was prepared from metallic magnesium powder and cobalt powder at 350-500 ℃ and 15-50 bar hydrogen pressure. X powder diffraction confirmed that the hydrides obtained below 400 ° C were tetragonal with unit cell parameters of a = 4.4863 and c = 6.154. The hydrides obtained at temperatures above 425 ° C had a hexagonal structure with a = 4.6754 and c = 10.0907. At the same time, the hydrogen absorption and desorption rate was also measured. According to the determination of pressure composition isotherm, the enthalpy of decomposition was obtained. Specific surface, electrical conductivity, catalytic properties were also measured.