Effect of acceptor and donor dopants on ferroelectric and piezoelectric properties of lead zirconate titanate ceramics

✍ Scribed by Ramam, Koduri ;Lopez, Marta

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 515 KB
• Volume: 203
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200622417

✦ Synopsis

Abstract

Dielectric, ferroelectric and piezoelectric properties of Pb~1−x~ La__~x~__ (Zr__~y~__ Ti~1−y~ )~1−(x /4)−(3/4)z~ Fe__~z~__ O~3~ ceramics for z = 0 to 6 mol% prepared by a mixed oxide method were investigated. Fe substitution in lead lanthanum zirconate titanate (PLZT) compositions resulted in a phase transformation from coexisting phases (ferroelectric rhombohedral (FE~RH~) and ferroelectric tetragonal (FE~TET~)) to intensified tetragonal phase. Grain size and apparent density increased with increasing acceptor (Fe) content up to 3 mol% in the PLZT system. The optimum dielectric properties (ϵ ~RT~, ϵ ~Tc~ and tan δ) were observed in 3 mol% Fe‐doped PLZT composition and then decreased thereafter. Acceptor (Fe) substitution in the PLZT system influenced the ferroelectric remanent polarization (P ~r~) and spontaneous (P ~s~) polarization, reaching saturation at 6 mol% Fe, while the coercive field (E ~c~) increased up to 3 mol% Fe‐doped PLZT composition. The piezoelectric properties are sensitive to acceptor (Fe) modification in the PLZT system which was proved by the decreasing trend of piezoelectric charge coefficient (d ~33~) up to 3 mol% Fe and then increasing to 6 mol% Fe while the piezoelectric planar coupling coefficient (k ~p~) showed a continuous decreasing trend throughout the series. Dielectric, ferroelectric and piezoelectric properties were characterized as a function of acceptor (Fe) concentration in the PLZT system for possible sensor and actuator applications. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)