MECHANISM OF ION-EXCHANGE IN ZIRCONIUM-PHOSPHATES .22. MIXED ZIRCONIUM TITANIUM PHOSPHATES Academic Article uri icon

abstract

  • -Titanium phosphate, Ti(HPO4)2H2O, was found to form two sodium ion exchanged phases. A half exchanged phase of ideal composition TiNaH(PO4)24H2O formed first. However, before all of the titanium phosphate was converted to this phase a second phase of higher Na+ content formed. Thus, a three phase solid existed until sufficient sodium ion uptake ( 5.5 meq/g) produced only the two exchanged phases. Finally, the half exchanged phase was converted to the more highly loaded one and this latter phase existed from 6-8 meq/g of Na+ uptake. Severe disordering of the crystal lattice during exchange is proposed to explain this unusual exchange behavior. A broad range of titanium phosphate-zirconium phosphate solid solutions was found to form. Their behavior towards Na+H+ exchange was determined and interpreted on the basis of the known behavior of the pure phases. Mixed TiZr solid solutions of their pyrophosphates were obtained at elevated temperatures. 1978.

published proceedings

  • JOURNAL OF INORGANIC & NUCLEAR CHEMISTRY

author list (cited authors)

  • CLEARFIELD, A., & FRIANEZA, T. N.

citation count

  • 31

complete list of authors

  • CLEARFIELD, A||FRIANEZA, TN

publication date

  • January 1978