ChemInform Abstract: Dielectric Study on Ionic Orientational Disorder in the Low-Temperature Phases of Ionic Plastic Crystal KNO2.
✍ Scribed by H. HONDA; N. ONODA-YAMAMURO; S. ISHIMARU; R. IKEDA; O. YAMAMURO; T. MATSUO
- Publisher
- John Wiley and Sons
- Year
- 2010
- Weight
- 32 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0931-7597
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✦ Synopsis
1998 dielectric properties, magnetic properties dielectric properties, magnetic properties D 9000
19 -015
Dielectric Study on Ionic Orientational Disorder in the Low-Temperature Phases of Ionic Plastic Crystal KNO 2 . -The complex dielectric permittivity of the title compound is measured in the frequency range 20-10 6 Hz and the temperature range 22-300 K. A small step-like anomaly of the static dielectric permittivity appears at the rhombohedral (phase II) to monoclinic (phase III) transition (T = 264.1 K). In phase III the static dielectric permittivity decreases gradually on cooling over a wide temp. range 50-264 K. This indicates that the orientation of the NO -2 ion is still disordered at high temperatures in phase III and becomes ordered gradually with decreasing temperature. A 180 • -flip motion model is proposed.
-(HONDA, H.;