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Combined neutron powder and X-ray single-crystal diffraction refinement of the atomic structure and hydrogen bonding of goslarite (ZnSO₄·7H₂O)

¹ Department of Geological Sciences and Geological Engineering, Queen’s University, Kingston, Ontario, Canada K7L 3N6
² Neutron Program for Materials Research, National Research Laboratory, Chalk River, Ontario, Canada K0J 1J0

^* E-mail: anderson{at}students.geol.queensu.ca

The atomic structure of synthetic, deuterated goslarite (ZnSO₄·7D₂O), a = 11.8176(6) Å, b = 12.0755(7) Å, c = 6.8270(4) Å, space group P2₁2₁2₁, Z = 4, has been refined in a combined neutron powder diffraction and X-ray single-crystal data refinement to wRp 1.92%, Rp 1.45% and R(F²) 12.66% for the neutron powder data contribution and R(F²) 8.72% for the X-ray single-crystal data contribution. Both data sets were necessary to achieve the best overall fit agreement in the Rietveld refinement and reasonable geometry within structural units. The results of this study confirm that the H-bonding scheme for goslarite is the same as that of the other epsomite group minerals. Small but significant variations of the Zn–O bond lengths can be attributed to details of the H bonds to the O atoms of the Zn octahedra. This investigation of the atomic structure and hydrogen bonding of goslarite is groundwork for future studies into phase relationships and the mechanisms of hydration and dehydration in the ZnSO₄–H₂O system.

KEYWORDS: goslarite, hydrogen bonding, mine waste, sulphate minerals, crystal structure, neutron diffraction

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