Dielectric Anomaly of Ammonium Nitrate in Low Frequency Region

概要

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Dielectric measurements are made on a pressed sample of ammonium nitrate powder in the frequency region from 25 c/s to 50 kc/s. Two main dispersions are found, one in the extremely low frequency region, supposed to be the blocking space charge effect, and the other in the slightly high frequency region, represented fairly well by a circular are in the Cole plot. The activation energy of the dipole orientation related to the latter relaxation is estimated to be about 0.58 ev for the phase III. The phase changes (IV←^^→III←^^→II) give no significant effect on the nature of such abnormal dispersion in the qualitative point of view. A model based on the co-operative action of ion pairs which are connected to each other by hydrogen bonds, is proposed for the explanation of the mechanism of this low frequency dispersion. The dielectric constant of the phase II is much larger than that of the phase III even for the measurement at a high frequency. This fact suggests the existence of large anomaly at a frequency much higher than 50 kc/s. The co-operative orientation of NO_3 ions in the neighbouring cells are suggested as a possible model in this case.
社団法人日本物理学会の論文
1963-09-05