Alkali Metal Hexafluorido Plumbates(IV) <i>A</i><sub>2</sub>[PbF<sub>6</sub>] (<i>A</i>=Na−Cs) and Luminescence of the Mn<sup>4+</sup>‐substituted Compounds <i>A</i><sub>2</sub>[PbF<sub>6</sub>] : Mn (<i>A</i>=Li−Cs) and Li<sub>2</sub>[<i>M</i>F<sub>6</sub>] : Mn (<i>M</i>=Ti, Ge, Sn)
European journal of inorganic chemistry