Detailed study of the phase transition in [Ni(H2O)6](NO3)2·(15-crown-5)·H2O and analysis in terms of mean-field theory.

The article focuses on the phase transition between 190 and 200 K in [Ni(H2O)6](NO3)2·(15-crown-5)·H2O. It states that differential scanning calorimetry (DSC) was conducted to examine the compound's thermal behavior while packings' rotatable overlays were made to compare the transition. Results show that structural changes expand over a wide range of temperature while the transition temperature ranges near the upper end.