Epitaxial PMN-PT Relaxor Thin Films: Dependence of Dielectric and Piezoelectric Properties on Film Thickness

1999 ◽  
Vol 596 ◽  
Author(s):  
V. Nagarajan ◽  
S. P. Alpay ◽  
C. S. Ganpule ◽  
B. Nagaraj ◽  
S. Aggarwal ◽  
...  
Keyword(s):  
Film Thickness ◽  
Piezoelectric Properties ◽  
Relative Dielectric Constant ◽  
Misfit Strain ◽  
Lead Magnesium Niobate ◽  
Oxide Electrodes ◽  
Order Of Magnitude ◽  
Lead Magnesium ◽  
Probe Microscope ◽  
Pt Films

AbstractThe effect of substrate induced constraint and misfit strain on the structure and piezoelectric properties of epitaxial relaxor ferroelectric lead magnesium niobate-lead titanate (PMN-PT) films were investigated. Relaxor PMN-PT epitaxial 100–400 nm thick films with top and bottom oxide electrodes were grown by pulsed laser deposition on (100) LaAlO3 substrates. A systematic decrease in the temperature of the dielectric maximum with increasing film thickness was observed. This is accompanied by an increase in the room temperature relative dielectric constant. The longitudinal piezoelectric coefficient measured using a scanned probe microscope, increases by almost an order of magnitude with increasing film thickness.

Investigation of High Frequency Mechanical Vibrations in PMN-32%PT Crystals by Laser Interferometry

2016 ◽  
Vol 251 ◽  
pp. 83-88
Author(s):  
Rymantas Jonas Kazys ◽  
Reimondas Sliteris ◽  
Justina Sestoke ◽  
Marius Zienius
Keyword(s):  
Lead Titanate ◽  
High Frequency ◽  
High Efficiency ◽  
Piezoelectric Properties ◽  
Laser Interferometry ◽  
Ultrasonic Transducers ◽  
Lead Magnesium Niobate ◽  
Vibration Modes ◽  
Mechanical Vibrations ◽  
Lead Magnesium

Lead magnesium niobate-lead titanate (PMN-PT) single crystal has first been successfully grown in 1990 by the Bridgman method using PbO as a flux. These single crystals have excellent piezoelectric properties. The PMN-PT crystals with different vibration modes may be used for development of novel high efficiency ultrasonic transducers due to high piezoelectric properties.

Dependence of dielectric and piezoelectric properties on film thickness for highly {100}-oriented lead magnesium niobate–lead titanate (70/30) thin films

2001 ◽  
Vol 16 (1) ◽  
pp. 268-275 ◽  
Author(s):  
Jeong Hwan Park ◽  
Susan Trolier-McKinstry
Keyword(s):  
Film Thickness ◽  
Space Charge ◽  
Lead Titanate ◽  
Lead Magnesium Niobate ◽  
Internal Space ◽  
Space Charge Field ◽  
Magnesium Niobate ◽  
Si Substrates ◽  
Lead Magnesium ◽  
Charge Field

Fiber textured {100}-oriented lead magnesium niobate–lead titanate (PMN–PT) (70/30) films with thicknesses between 0.35 and 2.1 mm were prepared using chemical solution processing. The degree of preferred orientation changed little with increasing thickness. However, the measured dielectric constant, remanent polarization, and piezoelectric coefficients (d31) increased with increasing film thickness. The effective d31 coefficients of highly {100}-oriented PMN–PT films on Pt-coated Si substrates were found to range from −16 to −96 pC/N. Ultraviolet illumination during poling resulted in abnormal aging behaviors and lower overall aging rates for the films. The initial nonlinear aging behavior was attributed to the presence of an internal space-charge field that developed from photoinduced charge carriers. As the space-charge field decays over time, the magnitude of d31 increased until 450–500 min after poling, at which time d31 remained either constant or declined slightly. Thus, the changes in d31 were limited to 1–2%/decade 500–600 min after poling.

scholarly journals Aperiodic oscillations in thermal focussing by single crystals of lead magnesium niobate

1996 ◽  
Vol 186 (1) ◽  
pp. 17-20 ◽  
Author(s):  
Richard O'sullivan ◽  
Xiping Zheng ◽  
James Scott ◽  
Zuoguang Ye ◽  
Hans Schmid
Keyword(s):  
Single Crystals ◽  
Lead Magnesium Niobate ◽  
Magnesium Niobate ◽  
Lead Magnesium
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