We report the synthesis and properties of a new layered material, $\mathrm{CrG}{\mathrm{e}}_{1-x}\mathrm{S}{\mathrm{e}}_{3+y}$. The crystal structure was determined by using single crystal x-ray diffraction and transmission electron microscopy. $\mathrm{CrG}{\mathrm{e}}_{1-x}\mathrm{S}{\mathrm{e}}_{3+y}$ crystallizes with a space group $R-3m$, featuring a double kagome layer of chromium atoms, sandwiched between disordered Ge-Se layers. This compound displays antiferromagnetic order below 50 K, unlike the ferromagnetic behavior in $\mathrm{CrGeT}{\mathrm{e}}_3$. Chromium displays an effective moment of $\sim 3.9{\mu }_{\mathrm{B}}/\mathrm{Cr}$, consistent with $\mathrm{C}{\mathrm{r}}^{3+}$ oxidation. The presence of this phase limits the possibility of a ferromagnetic $\mathrm{CrGeS}{\mathrm{e}}_3$ analogous to $\mathrm{CrGeT}{\mathrm{e}}_3$.

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• Antiferromagnetism
• Magnetic order
• Magnetic susceptibility
• Magnetism
• Kagome lattice
• Layered crystals
• Layered semiconductors
• Electron microscopy
• Magnetization measurements
• X-ray diffraction