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- W1991239942 abstract "Upon heating, certain cations exchanged into zeolite RHO undergo large shifts in their positions within the pores. In several of these materials, negative thermal expansion is observed in conjunction with these cation relocations. Rather than being the purely temperature-driven effects presumed in previous reports, a combination of in situ time-resolved synchrotron X-ray and neutron powder diffraction studies indicates that the cation relocations and framework distortions observed in Pb- and Cd-exchanged zeolite rho are mediated by the presence of water in specific sites in the pores of RHO. Rietveld refinements using these data reveal that the initial unit cell contraction (50 °C ≤ T ≤ 100 °C) is due to the loss of unbound water in the α-cages of rho. Water molecules in the double eight-ring (D8R) building units persist after this step, bound to the extraframework cations. The framework then contracts as water molecules are gradually removed (200 °C ≤ T ≤ 400 °C). During this period, the extraframework c..." @default.
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- W1991239942 date "2001-07-10" @default.
- W1991239942 modified "2023-10-10" @default.
- W1991239942 title "New Insight into Cation Relocations within the Pores of Zeolite Rho: In Situ Synchrotron X-Ray and Neutron Powder Diffraction Studies of Pb- and Cd-Exchanged Rho" @default.
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- W1991239942 doi "https://doi.org/10.1021/jp0100349" @default.
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