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The X-ray crystal structures of the two black, isotypic, mixed valent solids In 4 Te 3  ( a  = 15.619(1) Å,  b  = 12.749(1) Å,  c  = 4.4348(3) Å, space group  Pnnm ,  Z  = 4) and In 4 Se 3  ( a  = 15.296(1) Å,  b  = 12.308(1) Å,  c  = 4.0806(5) Å), were redetermined using single crystals isolated from homogeneous, microcrystalline samples. X-ray powder investigations in the composition range In 4 Se 3− x  S  x   (0 &lt;  x  &lt; 3) revealed heterogeneous samples for  x  &gt; 1, indicating the non-existence of “In 4 S 3 ” under these conditions. High pressure X-ray experiments with In 4 Te 3  (powder and single crystals) and In 4 Se 3  (powder) showed pronounced anisotropies of the compressibilities for the normal pressure modifications, which can be correlated to the structure and bonding situations in both compounds. At 4.1 GPa In 4 Te 3  decomposes to In + 3InTe, the latter one crystallizing in a rocksalt structure and incorporating excess Indium in the sense In 1 +  x  Te. At 16.0 GPa the mixture In + 3InTe undergoes a second phase transition. In 4 Se 3  transforms to a new high pressure phase of unknown structure at 8.8 GPa.

In 4 Te 3 und In 4 Se 3 : Neubestimmung der Kristallstrukturen, druckabhängiges Verhalten und eine Bemerkung zur Nichtexistenz von In 4 S 3