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MnSb$_2$Te$_4$, isostructural to MnBi$_2$Te$_4$, has the lattice parameters of \\textit{a}=4.2445(3)$\\AA$ and \\textit{c}=40.869(5)$\\AA$, respectively. With increasing Sb content in MnBi$_{2-x}$Sb$_x$Te$_4$, the \\textit{a}-lattice decreases linearly following the Vegards law while the \\textit{c}-lattice shows little compositional dependence. 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