Abstract
Dielectric and impedance measurements were performed on ceramics with composition Pb5xK6(1—x)Li4(1—x)Ta10O30, in wide frequency and temperature ranges, 101 to 109 Hz and 100 to 650 K, respectively. At low frequency and low temperature, a relaxor behavior is found for compositions corresponding to x > 0.70. Moreover, two other relaxations are observed: an ionic conduction relaxation at low frequency and high temperature and a network relaxation at high frequency and low temperature. The former is explained on the basis of the motion of Li+ cations in sites of coordination number 9 and the latter on the basis of correlation chains.
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