Deviation from Curie-Weiss behavior in relaxor ferroelectrics

Dwight Viehland, S. J. Jang, L. Eric Cross, and Manfred Wuttig
Phys. Rev. B 46, 8003 – Published 1 October 1992
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Abstract

The deviation from Cure-Weiss behavior has been investigated in lead magnesium niobate relaxor ferroelectrics. At high temperatures, the susceptibility was found to follow the Curie-Weiss relationship. A Curie constant and temperature of 1.2×105 and 398 K, respectively, were obtained. With decreasing temperature the deviation was found to increase. It is proposed that this deviation arises due to short-range correlations between polar regions, and that these correlations at high temperatures are the precursor to a freezing of the polarization fluctuations into a glassy state. A local (glassy) order parameter was calculated from the susceptibility by analogy to spin glasses [D. Sherrington and S. Kirkpatrick, Phys. Rev. Lett. 35, 1972 (1975)]. These results are compared to the rms polarization [G. Burns and F. Dacol, Solid State Commun. 48, 853 (1983)] and to the measured remanent polarization. The frequency and field dependence has also been investigated.

  • Received 5 February 1992

DOI:https://doi.org/10.1103/PhysRevB.46.8003

©1992 American Physical Society

Authors & Affiliations

Dwight Viehland

  • Materials Research Laboratory and Department of Materials Science Engineering, University of Illinois, Urbana, Illinois 61801

S. J. Jang and L. Eric Cross

  • Materials Research Laboratory, The Pennsylvania State University, State College, Pennsylvania 16802

Manfred Wuttig

  • Department of Materials and Nuclear Engineering, University of Maryland, College Park, Maryland 20742

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Vol. 46, Iss. 13 — 1 October 1992

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