Thermodynamics of cationic substitutions on titanyl hydrogen phosphate
摘要:
Heterophasic substitution of Group I and Group II metal cations for hydrogen ions of titanyl hydrogen phosphate in aqueous solutions has been studied by a potentiometric method. The thermodynamic parameters of the process have been determined. The exchange constants depend on the degree of cation hydration and increase in the following orders: Li+ < Na+ < K+ < Rb+ < Cs+ and Mg2+ < Ca2+ < Sr2+ < Ba2+. Our results make it possible to determine conditions for the efficient deactivation of high-salt liquid radioactive wastes and for the synthesis of stoichiometric compounds of the KTP family.
Composition-dependent dielectric properties of RbTiOPO4 single crystals
作者:Jna. Gavaldà、J. J. Carvajal、X. Mateos、M. Aguiló、F. Díaz
DOI:10.1063/1.3258000
日期:2009.11.2
We measured the ionic conductivity for two singlecrystals of RbTiOPO4 grown in self-fluxes with different chemical composition. Ionic conductivity depended on the composition of the self-flux solution in which the crystal was grown. One of the samples showed an anisotropic behavior along the three crystallographic axes while the other showed a nearly isotropic behavior of the ac conductivity.