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Effects of lanthanum modification on rhombohedral Pb(Zr1−xTix)O3 ceramics: Part II. Relaxor behavior versus enhanced antiferroelectric stability

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Abstract

Lanthanum-modified lead zirconate titanate ceramics Pb1−3/2xLax(Zr1−yTiy)O3 [PLZT 100x/100(1 − y)/100y] with Zr/Ti ratios close to the antiferroelectric-ferroelectric (AFE-FE) phase boundary were investigated by dielectric spectroscopy, Sawyer–Tower polarization techniques, and electron microscopy. An incommensurate antiferroelectric (AFEIn) phase was found to be stabilized from the rhombohedral FE state in the compositional series 100x/90/10 for x ≥ 0.02. The La content required to induce the AFEIn state increased as the Ti content was increased. For 100x/85/15, a state with relaxor-like dielectric behavior and nanodomains was observed to develop with increasing La content; however, the double-loop-like P-E curves were suggestive of antiferroelectric behavior. Investigations for the composition 6/85/15 revealed the formation of nanodomains from the AFEIn modulation, where the size of the nanodomains equaled the value of the AFEIn modulation wavelength. For this composition, P-E studies revealed double hysteresis characteristics, whereas dielectric investigations revealed relaxor-like behavior. It is suggested that the order within the nanodomain state may be antipolar over a range of compositions in high La content rhombohedral PLZT ceramics.

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Authors and Affiliations

  1. Department of Materials Sciences and Engineering and Materials Research Laboratory, University of Illinois, Urbana, Illinois, 61801, USA

    Xunhu Dai, Z. Xu, Jie-Fang Li & Dwight Viehland

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  1. Xunhu Dai
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  2. Z. Xu
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  3. Jie-Fang Li
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  4. Dwight Viehland
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Dai, X., Xu, Z., Li, JF. et al. Effects of lanthanum modification on rhombohedral Pb(Zr1−xTix)O3 ceramics: Part II. Relaxor behavior versus enhanced antiferroelectric stability. Journal of Materials Research 11, 626–638 (1996). https://doi.org/10.1557/JMR.1996.0076

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  • DOI: https://doi.org/10.1557/JMR.1996.0076

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