High electromechanical coupling piezoelectrics: relaxor and normal ferroelectric solid solutions

International Center for Actuators and Transducers, Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802, USA
Solid State Ionics (Impact Factor: 2.05). 01/1998; DOI: 10.1016/S0167-2738(98)00017-4

ABSTRACT A new category of piezoelectric ceramics with very high electromechanical coupling was discovered in a lead zinc niobate–lead titanate solid solution in a single crystal form. The maximum coupling factor k33 reaches 95%, which corresponds to the energy conversion rate twice as high as the conventional lead zirconate titanate ceramics. This paper reviews the previous studies on superior piezoelectricity in relaxor ferroelectric: lead titanate solid solutions and on the possible mechanisms of this high electromechanical coupling.

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    Advances in Ferroelectrics, Edited by Aimé Peláiz Barranco, 12/2012: chapter 5: pages 85-107; InTech., ISBN: 978-953-51-0885-6
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    ABSTRACT: Pb-containing relaxor ferroelectric ceramics are prepared by mechanochemical ceramic processing. Mechanochemical reactions in binary and ternary mixtures of the PbO-ZnO-Nb2O5 system are studied by x-ray diffraction. Disordered compounds with the columbite, changbaiite, and pyrochlore structures are prepared. The perovskite and pyrochlore phases in 0.9Pb(Zn1/3Nb2/3)O3 + 0.1ABO3 morphotropic phase boundary materials are shown to be in mechanochemical equilibrium. Among the ABO3 additives studied, BaMnO3 is the most effective for stabilizing the perovskite structure. The mechanochemical synthesis path has a strong effect on the phase composition of the resulting material. Conventional synthesis through a columbite phase leads to the predominant formation of a pyrochlore phase. Firing conditions also have a profound effect on the phase composition of the ceramics, but the disordered perovskite phase retains cubic symmetry.
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    ABSTRACT: Recibido el 20/01/2009. Aprobado en versión final el 29/06/2009. Sumario. Cerámicas basadas en PZN han sido obtenidas por el método cerámico tradicional a partir de la composición nominal (Pb 0.8 Ba 0.2)[(Zn 1/3 Nb 2/3) 0.7 Ti 0.3 ]O 3 . Una estructura perovskita romboédrica fue obtenida a partir del estudio es-tructural y el análisis dieléctrico mostró un comportamiento relajador para la transición de fase ferroeléctrica-paraeléctrica con una temperatura de transición muy cercana a la temperatura ambiente. Abstract. Pyroelectric ceramics based on PZN have been obtained by standard ceramic technique. Samples of composi-tion (Pb 0.8 Ba 0.2)[(Zn 1/3 Nb 2/3) 0.7 Ti 0.3 ]O 3 were studied, showing a pure rombohedral related-perovskite phase. Dielectric measurements exhibit a relaxor ferroelectric behavior with a transition temperature closed to room temperature. Slim hysteresis loops with only small remanent polarizations were found. The figure of merit (R V =9.7x10 -10 C/cm 2o C) and the dynamical pyroelectric response show a suitable material to be used in pyroelectric applications. The room temperature value of the dielectric permittivity shows that the studied system could be considered for potential application in the manufacture of multilayer ceramic capacitor.
    Revista Cubana de Fisica 01/2009; 26(2B):238-241. · 0.11 Impact Factor