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High-performance PMNߝPT thick films

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6 Author(s)
Kosec, Marija ; Jozef Stefan Inst., Ljubljana, Slovenia ; Uršič, H. ; Holc, Janez ; Hrovat, M.
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This article describes some of our work on 0.65Pb(Mg1/3Nb2/3)O3-0.35PbTiO3 (0.65PMN-0.35PT) thick films printed on alumina substrates. These thick films, with the nominal composition 0.65Pb(Mg1/3Nb2/3)O3-0.35PbTiO3, were produced by screen-printing and firing a paste prepared from an organic vehicle and pre-reacted fine particles of a very chemically homogeneous powder. To improve the adhesion of the 0.65PMN-0.35PT to the platinized alumina substrate, a Pb(Zr0.53Ti0.47)O3 layer was deposited between the electrode and the substrate. The samples were then sintered at 950°C for 2 h with various amounts of packing powder on the alumina (Al2O3) substrates. The sintering procedure was optimized to obtain dense 0.65PMN-0.35PT films. The films were then characterized using scanning electron microscopy as well as measurements of the dielectric and piezoelectric constants. The electrostrictive behavior of the 0.65PMN-0.35PT thick films was investigated using an atomic force microscope (AFM). Finally, substrate-free, large-displacement bending-type actuators were prepared and characterized, and the normalized displacement (i.e., the displacement per unit length) of the actuators was determined to be 55 μm/cm at 3.6 kV/cm.

Published in:

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on  (Volume:57 ,  Issue: 10 )

Date of Publication:

October 2010

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