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Single-crystal neutron diffraction study of β-Cs_3(HSO_4)_2[H_(2-x)(S_xP_(1-x)O_4] (x ≃ 0.5) at 15 K

Haile, S. M. and Klooster, W. T. (1999) Single-crystal neutron diffraction study of β-Cs_3(HSO_4)_2[H_(2-x)(S_xP_(1-x)O_4] (x ≃ 0.5) at 15 K. Acta crystallographica. Section B, Structural science, 55 (3). pp. 285-296. ISSN 0108-7681. doi:10.1107/S0108768198013573.

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The structure of β-Cs_3(HSO_4)_2[H_(2-x)(S_xP_(1-x)O_4] has been examined by single-crystal neutron diffraction at 15 K. The compound crystallizes in space group C2/c and contains four formula units in the unit cell, with lattice parameters a = 19.769(9), b = 7.685(2), c = 8.858 (3) Å and β = 100.60 (4)°. Refinement of P, S and H site occupancies indicated that the value of x (in the stoichiometry) is 0.500 (6). This, together with the unit-cell volume of 1322.8(14) Å^3, implies a density of 3.463 Mg m^(-3). The structure contains zigzag rows of XO_4 anions, where X = P or S, that alternate, in a checkerboard fashion, with zigzag rows of Cs cations. Moreover, there is one proton site, H(3), with an occupancy of 0.25 and one X-atom site, X(1), that is occupied by 0.5 P and 0.5 S. These features are in general agreement with a previous X-ray structure determination carried out at 298 K. In contrast to the X-ray study, however, it was found that two different structural models adequately fit the diffraction data. In the first model, the proton vacancies and the P atoms were assumed to be randomly distributed over the H(3) and X(1) sites, respectively, and to have no impact on the local structure. In the second model, several atoms were assigned split occupancies over two neighboring sites, to reflect the presence or absence of a proton vacancy, and the presence of P or S on the X(1) site. Refinement assuming the first model, in which anisotropic displacement parameters for 12 of 14 atom sites in the asymmetric unit were employed, yielded residuals wR(F^2) = 0.084 and wR(F) = 0.038. For the second model, in which anisotropic displacement parameters were utilized for only the five atoms that were not split relative to the first model, the residuals were wR(F^2) = 0.081 and wR(F) = 0.036.

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Additional Information:Copyright © 1999 International Union of Crystallography. (Received 7 August 1998; accepted 19 October 1998) Single crystals used in this study were kindly grown by Pamela Calkins. Funding for this work was provided in part by the National Science Foundation through a National Young Investigator Award (to SMH) and the Department of Energy, Office of Basic Energy Sciences, under contract DE-AC02-98CH10886. The authors thank C. Koehler III for technical assistance, and Professor Richard Marsh for insightful discussions.
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NSF National Young Investigator AwardUNSPECIFIED
Department of Energy (DOE)DE-AC02-98CH10886
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Record Number:CaltechAUTHORS:20131125-162531878
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42717
Deposited By: Jonathan Gross
Deposited On:02 Dec 2013 20:17
Last Modified:10 Nov 2021 16:27

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