On the mechanism of ion exchange in zirconium phosphates—XXVII Dehydration behavior of Cu(II) ion exchanged phases
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The dehydration behavior and phase changes of crystalline α-zirconium phosphate exchanged to increasing levels of Cu(II) content have been determined by thermal and X-ray methods. The fully exchanged compound is ZrCu(PO4)2·4H2O which loses 1 mole of water below 100°C and this phase in turn loses another 1.5 moles below 200°C forming ZrCu(PO4)2·1.5H2O. Additional mole of water is lost between 200 and 300°C yielding a solid with a poorly defined X-ray pattern. However, annealing in this temperature range produces a well crystallized phase (termed phase G). This phase has a variable water content ranging from 0.5 to zero moles and long heating times at 400-450°C are required to achieve the anhydrous state. In the region of low copper contents the phases formed are solid solutions which resemble α-zirconium phosphate phases. © 1980.
author list (cited authors)
Clearfield, A., & Pack, S. P.