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Pushcharovsky, Dmitry Y.
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article
Crystal chemistry of elpidite from Khan Bogdo (Mongolia) and its K- and Rb-exchanged forms
Abstract
Elpidite Na2ZrSi6O15 3H2O [space group Pbcm, a = 7.1312(12), b = 14.6853(12), and c = 14.6349(15) .ANG.] from Khan Bogdo (Mongolia) and its K- and Rb-exchanged forms K1.78Na0.16H0.06ZrSi6O15 0.85H2O [Cmce, a = 14.054(3), b = 14.308(3), and c = 14.553(3) .ANG.] and Na1.58Rb0.2H0.22ZrSi6O15 2.69H2O [Pbcm, a = 7.1280(10), b = 14.644(3), and c = 14.642(3) .ANG.] that were obtained by cation exchange at 90C, as well as K1.84Na0.11H0.05ZrSi6O15 0.91H2O [Cmce, a = 14.037(3), b = 14.226(3), and c = 14.552(3) .ANG.] and Rb1.78Na0.06H0.16ZrSi6O15 0.90H2O [Cmce, a = 14.2999(12), b = 14.4408(15), and c = 14.7690(12) .ANG.], obtained at 150C are studied by single-crystal X-ray diffraction and IR spectroscopy. The base of the structures is a heteropolyhedral Zr-Si-O framework whose cavities accommodate Na (K, Rb) cations and H2O mols.