K4PbO4 und K4GeO4 – ein Vergleich

K₄PbO₄ and K₄GeO₄ — a Comparison The question is: In which case are two compounds isotypic? The structures of K₄PbO₄ and K₄GeO₄ are derived using ?Schlegelprojektionen”? (reduced atomic distances and angles) and ?Erweiterte Schlegeldiagramme”? of the anions: O1, O2, O3 and O4. The difference is pointed out and discussed. For both compounds the interatomic distances are listed.