Front Cover: Aliovalent substitution in phosphide‐based materials – Crystal structures of Na10AlTaP6 and Na3GaP2 featuring edge‐sharing EP4 tetrahedra (E=Al/Ta and Ga) (Z. Anorg. Allg. Chem. 18/2021)

Abstract

The cover picture shows sketches of the two novel structures emphasizing two of the manifold possibilities of tetrahedral building blocks. Na10AlTaP6 and Na3GaP2 comprise discrete edge-sharing [(Al/Ta)P4] and linear chains of edge-sharing 1∞[GaP4/2] tetrahedra, respectively. The overlap of the experimental and calculated Raman spectrum show for the crystallographically mixed Al/Ta site exclusively heteroatomic dimers. Thus the swinging of the units unfold the atom arrangement. Due to the dedication of this issue to the 80th birthday of Prof. Schnöckel, who has intensively studied tetrahedral compounds by Raman spectroscopy, we substituted on the cover the wavelength of the 785 nm laser beam (382 THz) used for the Raman experiment by the frequency of the first pitch (294 Hz) of a famous song (see article 202100149).