<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Polycrystalline powders of Ba<sub>3</sub>GaS<sub>4</sub>X (X: Cl, Br), Ba<sub>3</sub>MSe<sub>4</sub>Cl (M: Ga, In), and Ba<sub>7</sub>In<sub>2</sub>Se<sub>6</sub>F<sub>8</sub> are prepared by solid state reactions of stoichiometric mixtures of BaS or BaSe, M<sub>2</sub>O<sub>3</sub>, and BaX<sub>2</sub> (sealed silica tubes, 1173 K, 20 h).</p> </abstract>