Dielectric-State Analysis in Solid-Solution Pb(Yb1/2Ta1/2)O3–Pb(Lu1/2Nb1/2)O3 |
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| Authors: | Yung Park Kurn Cho |
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| Affiliation: | Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB2 3QZ, United Kingdom;Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Taejon 305–701, Korea |
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| Abstract: | The structure and temperature dependence of complex lead perovskite dielectrics were investigated for the system (1 ? x )Pb(Yb1/2Ta1/2)O3– x Pb(Lu1/2Nb1/2)O3. Superlattice reflections for the compositions 0.8 < x < 1.0 were observed by X-ray diffractometry, and the temperature-composition dielectric-state diagram was determined. In the present study, the disordered middle composition, with 0.2 < x < 0.8, showed a diffuse paraelectric–ferroelectric phase transition, whereas the ordered end compositions, with 0 ≤ x < 0.2 and 0.8 < x ≤ 1.0, revealed successive sharp paraelectric–antiferroelectric and weak antiferroelectric–ferroelectric phase transitions. The dielectric state was confirmed by examining the variation of polarization ( P ) with electric field ( E ). |
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| Keywords: | dielectric materials/properties lead perovskites |
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