1992 年 61 巻 7 号 p. 2220-2223
Dielectric dispersion of a Haldane compound nickel trimethylenediamine nitrite perchlorate Ni(C3H10N2)2NO2ClO4 (NINO) has been measured around the structural phase transition at 378.5 K. The dielectric constant varies like a step at the phase transition and the dielectric dispersion of Debye type was observed along an axis perpendicular to the electrically polar axis above Tc.
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