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Mo F, Mathiesen RH, Beukes JA, et al. Rochelle salt - a structural reinvestigation with improved tools. I. The high-temperature para-electric phase at 308 K. IUCrJ. 2015;2:19-28doi: 10.1107/S2052252514022155.
Mo, F., Mathiesen, R. H., Beukes, J. A., & Vu, K. M. (2015). Rochelle salt - a structural reinvestigation with improved tools. I. The high-temperature para-electric phase at 308 K. IUCrJ, 219-28. https://doi.org/10.1107/S2052252514022155
Mo, Frode, et al. "Rochelle salt - a structural reinvestigation with improved tools. I. The high-temperature para-electric phase at 308 K." IUCrJ vol. 2 (2015): 19-28. doi: https://doi.org/10.1107/S2052252514022155
Mo F, Mathiesen RH, Beukes JA, Vu KM. Rochelle salt - a structural reinvestigation with improved tools. I. The high-temperature para-electric phase at 308 K. IUCrJ. 2015 Jan 01;2:19-28. doi: 10.1107/S2052252514022155. eCollection 2015 Jan 01. PMID: 25610624; PMCID: PMC4285877.
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IUCrJ. 2015 Jan 01;2:19-28. doi: 10.1107/S2052252514022155. eCollection 2015 Jan 01.

Rochelle salt - a structural reinvestigation with improved tools. I. The high-temperature para-electric phase at 308 K.

IUCrJ

Frode Mo, Ragnvald H Mathiesen, Jon Are Beukes, Khanh Minh Vu

Affiliations

  1. Department of Physics, Norwegian University of Science and Technology , Høgskoleringen 5, N-7491 Trondheim, Norway.

PMID: 25610624 PMCID: PMC4285877 DOI: 10.1107/S2052252514022155

Abstract

The crystal structure of the high-temperature paraelectric phase of Rochelle salt (K(+)·Na(+)·C4H4O6 (2-)·4H2O) at 308 K has been reinvestigated using synchrotron X-ray diffraction with refinement parameters R(int) = 0.0123, final (shift/e.s.d.)max = 0.019, R 1(all) = 0.0371 and wR 2(all) = 0.0608. The application of a new gas-flow sample cell designed to control both temperature and relative humidity permitted collection of data of excellent quality and enabled unrestrained refinement of all parameters, including those of the isotropic hydrogen atoms. A precise description of the structure has ensued. One K atom is disordered between two symmetry-equivalent sites; three O atoms in three of the four water molecules exhibit very strong anisotropy. Refining one O atom as a split atom was successful, yielding small improvements in the bonding parameters of several H atoms. The H atoms of all water molecules behave as single pairs. Their final U values are of moderate magnitude indicating that these atoms do not participate in the anisotropy of the parent O atoms. It is suggested that the three water O atoms are in part statically disordered, while the bonded H atoms are not. Except for the split K atom and the three water O atoms there is no evidence of general disorder in the structure.

Keywords: control of sample environment; single-crystal X-ray study; synchrotron radiation

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