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Stirring the microporous germanate Ag 4 Ge 7 O 16 ·6H 2 O in aqueous sodium chloride solution leads to a fully-ion-exchanged product Na 4 Ge 7 O 16 ·6H 2 O, space group  R 3 m ,  Z  = 1 with  a  = 7.759(3) Å,  α  = 89.08(2)°,  V  = 466.9 Å 3 . Similar treatment of Rb 3 HGe 7 O 16 ·3H 2 O yields a partially-ion-exchanged material, Na 4-   x   -   y  Rb  x  H  y  Ge 7 O 16 · n H 2 O, ( x  = 0.80(4),  y  ≈ 0.6,  n  ≈ 6), with  a  = 7.759(5) Å,  α  = 89.53(4)°,  V  = 467.0 Å 3 . The disordered structures have been refined using the Rietveld method from powder synchrotron X-ray diffraction data. The relationship between the structures of the two materials is discussed.

Na 4 Ge 7 O 16 ·6H 2 O and Na 2.6 Rb 0.8 H 0.6 Ge 7 O 16 ·6H 2 O refined from powder synchrotron X-ray diffraction data