CONDUCTIVITY RELAXATION PARAMETERS OF SOME H+ AND K+ CONDUCTING IN THE POLYCRYSTALLINE COMPOUND KDYP3O10

Citation
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
Citations number
34
Categorie Soggetti
Physics, Condensed Matter","Chemistry Physical
Journal title
ISSN journal
01672738
Volume
110
Issue
3-4
Year of publication
1998
Pages
269 - 275
Database
ISI
SICI code
0167-2738(1998)110:3-4<269:CRPOSH>2.0.ZU;2-8
Abstract
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.