(NH4)2WTe2O8 at 5.09 GPa: a single‐crystal study using synchrotron radiation

The polar crystal structure of diammonium [octaoxidoditellurato(IV)]tungstate, (NH₄)₂WTe₂O₈, was studied at high pressures using single‐crystal X‐ray diffraction in a diamond‐anvil cell at the HASYLAB synchrotron (DESY, Hamburg, Germany). No phase transition was observed up to 7.16 GPa. However, a full structure determination at 5.09 GPa shows that the coordination number of one of the two non‐equivalent Te atoms has decreased from four to three.