The heat capacities of hydroxylammonium chloride, sulfate, and phosphate

The heat capacities of hydroxylammonium chloride, sulfate, and phosphate in the crystalline state were measured by adiabatic calorimetry between 5 and 315 K. Theoretical analyses of the experimental data for the studied compounds were made. In addition to electrostatic interactions between anionic and cationic sublattices, the existence of additional interactions such as H-bonding for hydroxylammonium phosphate was supposed.