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首页> 外文期刊>Physical review, B. Condensed matter and materials physics >Anisotropy of electric field frezing of the relaxor ferroelectric Pb(Mg1/3Nb2/3)O-3
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Anisotropy of electric field frezing of the relaxor ferroelectric Pb(Mg1/3Nb2/3)O-3

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摘要

The ferroelectric E-T phase diagram of relaxor ferroelectrics depends on the way the ferroelectric transition lines are approached. Here, we present the E-T phase diagram of relaxor Pb(Mg1/3Nb2/3)O-3 where the temperature was held constant and the electric dc bias field applied along the 111 and 001 directions was varied. Strong anisotropy was observed for both directions. For the 111 direction, the critical point was shown to exist at practically the same field as in the E=const, T=variable case, whereas no critical point could be determined for the 001 direction for vertical bar E-bias vertical bar < 20 kV/cm. When the electric field was applied along the 111 direction, a strongly nonlinear first-order-type jump in the polarization due to the cooperative ordering transition was observed. In the 001 direction, on the other hand, only a smooth field dependence of the polarization was found, indicating the lack of cooperative ordering.

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