Dielectric‐State Analysis in Solid‐Solution Pb(Yb 1/2 Ta 1/2 )O 3 –Pb(Lu 1/2 Nb 1/2 )O 3

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Abstract
The structure and temperature dependence of complex lead perovskite dielectrics were investigated for the system (1 − x )Pb(Yb 1/2 Ta 1/2 )O 3 – x Pb(Lu 1/2 Nb 1/2 )O 3 . 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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