The aim of the research was to study the process of dehydration of zinc-cobalt(II) phosphates during heat treatment. Zinc-cobalt(II) phosphate tetrahydrates were used as the main research objects. The content of ingredients in the composition of phosphates was as follows, % mass.: Zn, 41.8–23.5; Co, 2.3–12.8; P, 13.6–13.8; H2O, 16.1–16.3. Spectral methods were used to study the process and products of dehydration. Infrared absorption spectra were recorded at 20 ℃ and –190 ℃, as well as in the process of heating phosphates. X-ray phase analysis was performed.
