Chiral and Polar Duality Design of Heteroanionic Compounds: Sr<sub>18</sub>Ge<sub>9</sub>O<sub>5</sub>S<sub>31</sub> Based on [Sr<sub>3</sub>OGeS<sub>3</sub>]<sup>2+</sup> and [Sr<sub>3</sub>SGeS<sub>3</sub>]<sup>2+</sup> Groups
Advanced science