Acta Cryst. (2008). E64, m507-m508  [ doi:10.1107/S1600536808005266 ]

Potassium sodium (2R,3R)-tartrate tetrahydrate: the paraelectric phase of Rochelle salt at 105 K

C. H. Görbitz and E. Sagstuen

Abstract: Rochelle salt, K⁺·Na⁺·C₄H₄O₆^2-·4H₂O, is known for its remarkable ferroelectric state between 255 and 297 K. The current investigation, based on data collected at 105 K, provides very accurate structural information for the low-temperature paraelectric form. Unlike the ferroelectric form, there is only one tartrate molecule in the asymmetric unit, and the structure displays no disorder to large anisotropic atomic displacements.

Online 5 March 2008

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