N. Zouari et al., CONDUCTIVITY RELAXATION PARAMETERS OF SOME H+ AND K+ CONDUCTING IN THE POLYCRYSTALLINE COMPOUND KDYP3O10, Solid state ionics, 110(3-4), 1998, pp. 269-275
Polycrystalline samples of KDyHP3O10 was obtained by heating for 12 ho
ur at 553 K a mixture containing K2CO3, Dy2O3 and H3PO4. Samples were
characterized through X-ray diffraction, examined by IR vibrational sp
ectroscopy and impedance and modulus spectroscopy techniques. The cond
uctivity relaxation parameters of some H+ and K+ conducting in this co
mpound have been determined from an analysis of ac conductivity data m
easured in a wide temperature range. Transport properties in this mate
rial appears as due to H+ and K+ ions hopping mechanism. The stretched
exponential function exp[-(t/tau(sigma))(beta)] has been used to desc
ribe the conductivity relaxation. The relaxation parameters have been
investigated as a function of the nature of mobile ions. The results o
btained are shown to be in good agreement with the predictions of the
Ngai coupling model. (C) 1998 Elsevier Science B.V. All rights reserve
d.