31P chemical shift and relaxation study of the pseudo-one-dimensional ferroelectric transition in CsD2PO4

15 March 1980

journal article
research article
Published by AIP Publishing in The Journal of Chemical Physics

Vol. 72 (6) , 3626-3629
https://doi.org/10.1063/1.439623

Abstract

The ³¹P chemical shift tensors σ have been determined above and below T_c. The spin–lattice relaxation time T₁ (³¹P) was measured as a function of temperature at 109.3 and 36.4 MHz. The paraelectric ³¹P chemical shift tensor was found to be the average of the two tensors observed in the ferroelectric phase. This shows that the phase transition is triggered by the ordering of the O–H(2) ⋅⋅⋅O deuterons. The intrinsic O–H(2) ⋅⋅⋅O deuteron intrabond jump time is, in the absence of the interactions, of the same order as in KD₂PO₄. The anomalously short T₁ (³¹P) is the result of an ’’anisotropy slowing down’’ of the order parameter fluctuations due to the pseudo‐one dimensional nature of correlations in CsD₂PO₄.

Keywords

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