SmCo_5是一种磁性很强的永磁材料。1969年,Zijlstra发现SmCo_5在室温、常压下还能可逆地吸、放氢,以后又发现与SmCo_5类似的晶体结构的金属间化合物LaNi_5也能可逆地吸、放氢,LaNi_5的贮氢密度高达每立方厘米有氢原子5.5×10~(22)个,而4°K固态氢的密度只有5.2×10~(22)原子·厘米~(-3)。由此可见,LaNi_5的贮氢密度与固态氢相近,这就为氢能源的开发和利用,创造了很好的前景。 SmCo_5目前已是国内外商品化的产品,LaNi_5在 SmCo_5 is a highly magnetic permanent magnet material. In 1969, Zijlstra found that SmCo_5 reversibly sucked and discharged hydrogen at room temperature under normal pressure. Later, it was found that LaNi_5, an intermetallic compound with a crystal structure similar to that of SmCo_5, was able to absorb and discharge hydrogen reversibly. The hydrogen storage density of LaNi_5 There are 5.5 × 10 ~ (22) hydrogen atoms per cubic centimeter, while the density of 4 ° K solid hydrogen is only 5.2 × 10 ~ (22) atoms · cm ~ (-3). Thus, LaNi_5 hydrogen storage density and solid hydrogen close, which for the development and utilization of hydrogen energy, and created a very good prospect. SmCo_5 is currently a commercial product at home and abroad, LaNi_5 in