Kinetics of H+/Na+ Ion Exchange on H1 ± xZr2 − xMx(PO4)3 (M = Y or Nb) NASICON Materials

Abstract

The thermodynamic parameters of ion exchange have been estimated for HZr2(PO4)3 · H2O and the products of its aliovalent doping. Ion exchange occurs via formation of the (H3O1 − xNax)Zr2(PO4)3 solid-solution series. As in the case of ion exchange on layered zirconium phosphate (Zr(HPO4)2 · H2O), the interdiffusion coefficient and the major interfacial defect generation processes are considerably affected by the contact-solution pH.