The composition of intermediate products of the thermal decomposition of (NH$_{4}$)$_{2}$ZrF$_{6}$ to ZrO$_{2}$ from vibrational-spectroscopy data

Thermal decomposition of (NH$_{4}$)$_{2}$ZrF$_{6}$ resulting in ZrO$_{2}$ formation within the temperature range of 20$^{\circ}$ – 750$^{\circ}$С has been investigated by means of thermal and X-ray diffraction analysis and IR and Raman spectroscopy. It has been established that thermolysis proceeds in six stages. The vibrational-spectroscopy data for the intermediate products of thermal decomposition have been obtained, systematized, and summarized.