Magnetism and Crystal Structure of Zirconium Compound with Laves Structure

Magnetic studies were performed on intermetallic compounds with Laves‐type structure, $(\mathrm{Zr}\mathrm{,\hspace{0.17em}}\mathrm{Nb}){\mathrm{Fe}}_2$ , $(\mathrm{Zr}\mathrm{,\hspace{0.17em}}\mathrm{Mo}){\mathrm{Fe}}_2$ , $\mathrm{Zr}(\mathrm{Fe}\mathrm{,\hspace{0.17em}}\mathrm{Mn}{)}_2$ , $\mathrm{Zr}(\mathrm{Fe}\mathrm{,\hspace{0.17em}}\mathrm{V}{)}_2$ , and $\mathrm{Zr}(\mathrm{Fe}\mathrm{,\hspace{0.17em}}\mathrm{Co}{)}_2$ . The crystal structure of all the compounds except $\mathrm{Zr}(\mathrm{Fe}\mathrm{,\hspace{0.17em}}\mathrm{Co}{)}_2$ changes from the ${\mathrm{MgCu}}_2$ type to ${\mathrm{MgZn}}_2$ type with decreasing ${\mathrm{ZrFe}}_2$ content. The magnetism changes from ferromagnetism to paramagnetism with change from ${\mathrm{MgCu}}_2$ type to ${\mathrm{MgZn}}_2$ type, and it is concluded that the ${\mathrm{MgCu}}_2$ structure favors ferromagnetism and ${\mathrm{MgZn}}_2$ structure does not. $\mathrm{Zr}(\mathrm{Fe}\mathrm{,\hspace{0.17em}}\mathrm{Co}{)}_2$ has a ${\mathrm{MgCu}}_2$ structure over the entire composition range and the magnetism changes from ferromagnetism to paramagnetism with decreasing ${\mathrm{ZrFe}}_2$ content.