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Ac conductivity and dielectric relaxation studies in the polycrystalline compound KYHP3O10

✍ Scribed by N. Zouari; H. Khemakhem; T. Mhiri; A. Daoud

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
207 KB
Volume
60
Category
Article
ISSN
0022-3697

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✦ Synopsis

Polycrystalline samples of KYHP 3 O 10 were obtained by heating a mixture containing K 2 CO 3 , Y 2 O 3 and H 3 PO 4 for 12 h at 553 K. The samples were characterized by X-ray diffraction and examined by impedance spectroscopy technique. Ac conductivity and dielectric relaxation in this compound have been evaluated. A break was observed in the curve of log sT versus 1000=T; accompanied at high temperature by a decreasing of activation energy and increasing of conductivity about 10 times higher than that of KDyHP 3 O 10 . These evolutions are strongly coupled to the structure modification. Dielectric relaxation is examined using the modulus formalism. The suitability of stretched exponential relaxation function has been investigated. The activation energies obtained from the impedance and modulus spectra are close, suggesting that the ionic transport in the material investigated is due to a hopping mechanism.

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