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以N_4部分置换Co,提高Gd(Co_(1-x)Ni_x)_5化合物的稳定性,并改变其分解机理。GdCo_5的分解温度约比850℃稍高一点,在此温度以下GdCo_5转变为Gd_2Co_(17)和Gd_2Co_7相,由于相变驱动力很小,分解反应仅局限于一些活化区如晶界之类及其附近,其机理是亚稳定分解(spinodal decomosifion)。它的X射线花样未发现Gd_2Co_7相的线条,很可能是由于Gd_2Co_7相内部的Gd原子分布不均匀,点阵结构尚部分处于无规状态所致。GdCo_4Ni的分解温度约为800℃,其分解机理与GdCo_5的完全不同,与过饱和固溶体的沉淀很相似。
Partial replacement of Co with N_4 increased the stability of Gd (Co_ (1-x) Ni_x) _5 compounds and changed their decomposition mechanism. The decomposition temperature of GdCo_5 is slightly higher than that of 850 ℃, and the GdCo_5 transitions to Gd_2Co_ (17) and Gd_2Co_7 below this temperature. Due to the small phase transformation driving force, the decomposition reaction is limited to some activation zones such as grain boundaries and their Near the mechanism of its metastable decomposition (spinodal decomosifion). Its X-ray pattern does not find the Gd_2Co_7 phase lines, probably due to the uneven distribution of Gd atoms in the Gd_2Co_7 phase, and the lattice structure is still partially in a random state. The decomposition temperature of GdCo_4Ni is about 800 ℃. The decomposition mechanism of GdCo_4Ni is completely different from that of GdCo_5, which is similar to that of supersaturated solid solution.