Abstract
This paper describes a study of the nature and the mechanism of ion transfer in Ca6.25Pb4.25(VO4)7 with β-Ca3(PO4)2-type structure by the Tubandt method. The comparison of weight change to the quantity of electricity passed through the stack allowed us to state that migration of both Ca2+ and Pb2+ cations was present. The transference numbers were found to be 0.33 and 0.67 for Ca2+ and Pb2+ cations, respectively. The phase composition of samples after the Tubandt measurements was studied by powder X-ray diffraction and scanning electron microscopy. The quantitative phase analysis carried out by the Rietveld method using XRD diffraction data revealed the formation of five phases in anodic and cathode pellets other than Ca6.25Pb4.25(VO4)7. The quantity of phases in the samples depends on the location of pellets during the Tubandt measurements.
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