Investigation of Mn, Fe, and Ni Incorporation in CeCo2Al8

Single crystals of CeCo2–xMxAl8 (M = Mn, Fe, Ni; 0 ≤ x B/mol Ce and slightly higher than Ce3+ only magnetic moment. The unit cell volumes of Fe-doped compounds also increase with increasing Fe concentration. However, the cell volume of CeCo2–xFexAl8 decreases for x = 1.00 and is not Curie–Weiss possibly because of valence fluctuation.

CeCo₂₋ₓMₓAl₈（M为锰Mn、铁Fe、镍Ni；0≤x）的单晶体，其每摩尔铈的磁矩略高于仅以三价铈（Ce³+）形式存在时的磁矩。铁掺杂化合物的晶胞体积同样随铁掺杂浓度的升高而增大。然而当x=1.00时，CeCo₂₋ₓFeₓAl₈的晶胞体积反而减小，且其不满足居里-外斯（Curie–Weiss）定律，该现象可能源于价态涨落。