Single crystals of barium zirconium sulfide, Ba3Zr2S7, were prepared f
rom BaS, Zr and S at 1323 K by using a BaCl2 flux. The compound belong
s to the Ruddlesden-Popper (A(n+1) B(n)X3n+1) family with A = Ba, B =
Zr, X = S and n = 2. It is isostructural to Sr3Ti2O7 and crystallizes
in alternately stacked double perovskite BaZrS3 layers and rocksalt Ba
S layers.