Abstract
Neutron diffraction has been used to study the hydration of calcium ions confined to the 8.5-A pores between flat vermiculite clay platelets. We have measured the first 27 (00l) Bragg reflections for hydrated calcium vermiculite of two isotopic compositions, the first containing D 2 O and the second containing H 2 O. We have then used difference analysis to establish the structure of the interlayer water molecules. We find that in contrast to calcium ions in 1 m CaCl 2 , which are coordinated to 10 water molecules, calcium ions intercalated into the vermiculite clay are coordinated to an average of only 6 water molecules
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