Synthesis and Ionic Conductivity of NaZr2(AsO4)(x)(PO4)(3-)(x)

摘要

Arsenate phosphates NaZr2(AsO4)(x)(PO4)(3 -)(x) are synthesized by the sol-gel method with subsequent annealing at 1123 K. Thus obtained specimens are investigated using X-ray diffraction analysis, IR and impedance spectroscopy. In the NaZr2(AsO4)(x)(PO4)(3 -)(x) system, continuous solid solution (0 <= x <= 3) with NaZr2(PO4)(3) (NASICON) structure forms. According to the impedance spectroscopy data, an increase of the content of arsenic in the NaZr2(AsO4)(x)(PO4)(3 -)(x) system leads to an increase of the sodium-ionic conductivity; for NaZr2(AsO4)(3), it reaches 8 x 10(-5) S/cm at 773 K. At the same time, the activation energy of conductivity of this material (50 +/- 1 kJ/mol) appears to be twice lower than the activation energy of conductivity of NaZr2(PO4)(3) (100 +/- 1 kJ/mol).