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Results of crystallographic refinement, the relationship between electroncounts and structural stability, and magnetic characterization of YT$_x$Ge$_2$(T= Cr, Mn, Fe, Co, and Ni) prepared using the arc melting method arepresented. These YT$_x$Ge$_2$ compounds crystallize in theBaCuSn$_2$-CeNi$_1$$_-$$_x$Si$_2$-type structure with space group Cmcm, and thesite occupancies of 3d transition metals range from x = 0.22(1) for Cr to x =0.66(1) for Ni. Based on a combination of single crystal and powder X-raydiffraction and scanning electron microscopy, the trends are clearlyestablished that the smaller transition metal atoms exhibit larger occupancieson T (Cu) site. Our investigation into the relationship between electron countand site defect reveals that a stable configuration is obtained when reaching10.3e- per transition metal (Y+T), which strongly correlates with the defectobserved in the case of T metals. Magnetic properties measurements indicateparamagnetism for T = Cr, Fe, and Co, but ferromagnetism for T = Mn with aCurie temperature at 293 K and effective moment ~ 3.6 uB/Mn. The absence ofsuperconductivity in this series is surprising because they consist of similarbuilding blocks and electron counts to superconductingYGe$_1$$_.$$_5$$_+$$_d$Si$_2$ except for 3d transition metals. Introducing 3dtransition metals into the system plays a critical role in suppressingsuperconductivity, offering new insights into the interplay betweensuperconductivity and magnetism in layered intermetallics.

Electron Counts, Structural Stability, and Magnetism in BaCuSn$_2$-CeNi$_1$$_-$$_x$Si$_2$-type YT$_x$Ge$_2$ (T= Cr, Mn, Fe, Co, and Ni)