An explanation of the electron paramagnetic transitions and low temperature entropy anomalies of hexammine nickel halides

A point charge electrostatic model is used to explain the sudden increase in electron paramagnetic resonance linewidth at critical temperatures Tc and the low temperature entropy anomalies exhibited by hexammine nickel halides. It is suggested that these results are due to hindered rotation of the H3 groups between different equilibria arrangements of H3 protons within the solids. Barriers within the crystals are computed by assigning charges β|e| to each proton site, and summing the β2e2/rij terms between protons i and j on the same and on neighbouring Ni(NH3)6 clusters. Low and high energy arrangements of protons within each cluster are obtained.

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