Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Phase Transition in the Ionic Modification of Phosphorus Pentachloride, [PCl4][PCl6]. Chlorine Nuclear Quadrupole Resonance Study
Hideaki ChiharaNobuo Nakamura
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1973 Volume 46 Issue 1 Pages 94-96

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Abstract

Chlorine-35 nuclear quadrupole resonance frequencies in the ionic crystal PCl4+·PCl6 were redetermined. Ten resonance lines were found and their temperature dependences were measured below the second order phase transition point at 102 K. The splitting Δvi in the resonance lines in the low temperature phase showed a similar temperature dependence as the order parameter. This was accounted for by a librational soft mode theory based on an anharmonic coupling between molecular or ionic librational modes in the crystal.

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