Dielectric properties of complex perovskite lead scandium tantalate under dc bias

The weak-field dielectric properties of ordered, disordered, and lead-deficient disordered Pb(Sc0.5Ta0.5)O-3 (PST) ceramics (PST-O, PST-D, and PST-DV, respectively) were investigated under various de-bias conditions. The de-bias field influences the paraelectric-to-ferroelectric transition in PST-O and the relaxor-to-normal-ferroelectric transition in disordered PST-D, Phase diagrams, with respect to de bias and temperature, were proposed for ordered and disordered PST materials. A field-induced ferroelectric state that originated from the residual non-ordered regions in PST-O was revealed by analyzing the Curie-Weiss behavior of the materials under bias. It is shown that, in PST-DV, a de bias cannot induce an abrupt ferroelectric-to-relaxor transition. A dielectric anomaly observed at low temperatures in all three types of PST materials is attributed to a poling process.


Published in:
Journal of the American Ceramic Society, 81, 6, 1577-1582
Year:
1998
ISSN:
0002-7820
Keywords:
Note:
Chu, F Ecole Polytech Fed Lausanne, DMX, Lab Ceram, CH-1015 Lausanne, Switzerland Ecole Polytech Fed Lausanne, DMX, Lab Ceram, CH-1015 Lausanne, Switzerland
Zv175
Times Cited:12
Cited References Count:14
Laboratories:




 Record created 2006-08-21, last modified 2018-01-27


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