Compositions – Piezoelectric
Reexamination Certificate
2006-03-29
2010-06-29
King, Roy (Department: 1793)
Compositions
Piezoelectric
Reexamination Certificate
active
07744773
ABSTRACT:
A method to produce low-temperature sinterable powders which are then subsequently used to fabricate freestanding piezoelectric films with very large electric-field-enhanced piezoelectric response is provided. The −d31coefficient for PMN-PT layers can be as high as 2000 pm/V, larger than that of commercial single crystalline PMN-PT bulk materials, at 10 kV/cm (or 20 V over the 20-micron film thickness). In contrast to single crystals, the polycrystalline freestanding films are easy to fabricate and can be made into any size. The films are also easily miniaturized. The method can be applied to nearly any piezoelectric material.
REFERENCES:
patent: 5874126 (1999-02-01), Kahn et al.
patent: 2003/0235681 (2003-12-01), Sebastian et al.
patent: 2004/0265664 (2004-12-01), Badding et al.
Liu et al, Preparation and orientation control of Pb1.1(Zr0.3Ti0.7)O3 thin films by a modified sol-gel process 46 Materials Letters 239 (2000).
Yasuyoshi Saito et al., “Lead-Free Piezoceramics,” Nature, 2004, pp. 84-87, vol. 432.
T. Haccart et al., “Evaluation of Niobium Effects on the Longitudinal Piezoelectric Coefficients of Pb(Zr,Ti)O3 Thin Films,” Applied Physics Letters, 2000, pp. 3292-3294, vol. 76, No. 22.
Gun-Tai Park et al., “Measurement of Piezoelectric Coefficients of Lead Zirconate Titanate Thin Films by Strain-Monitoring Pneumatic Loading Method,” Applied Physics Letters, 2002, pp. 4606-4608, vol. 80, No. 24.
Seung-Eek Park et al., “Ultrahigh Strain and Piezoelectric Behavior in Relaxor Based Ferroelectric Single Crystals,” J. Applied Physics, 1997, pp. 1804-1811, vol. 82, No. 4.
Joe Kelly et al., “Effect of Composition on the Electromechanical Properties of (1−x)Pb(Mg⅓Nb⅔)O3−xPbTiO3 Ceramics,” J. American Ceramics Soc., 1997, pp. 957-964, vol. 80, No. 4.
Data of Commercially Available Product, EDO Corporation, 1999, pp. 1-6.
Data of Commercially Available Product, APC International Ltd., pp. 1-2, (2005).
Huiming Gu et al., Single-Calcination Synthesis of Pyrochlore-Free 0.9Pb(Mg⅓Nb⅔)O3−0.1PbTiO3 and Pb(Mg⅓Nb⅔)O3 Ceramics Using a Coating Method, J. American Ceramics Soc., 2003, pp. 217-221, vol. 86, No. 2.
Hongyu Luo et al., “Comparison in the Coating of Mg(OH)2 on Micron-Sized and Nanometer-Sized Nb2O5 Particles,” Int. J. Appl. Ceram. Technol., 2004, pp. 146-154, vol. 1, No. 2.
Hongyu Luo et al., “Synthesis of PMN and 65PMN-35PT Ceramics and Films by a New Suspension Method,” Ceramic Trans., 2003, pp. 251-260, vol. 136.
Shaoping Li et al., “The Extrinsic Nature of Nonlinear Behavior Observed in Lead Zirconate Titanate Ferroelectric Ceramic,” J. Appl. Physics, 1991, pp. 7219-7224, vol. 69, No. 10.
W. Ren et al., “Nonlinear Strain and DC Bias Induced Piezoelectric Behaviour of Electrostrictive Lead Magnesium Niobate-Lead Titanate Ceramics Under High Electric Fields,” J. Physics D: Applied Physics, 2002, pp. 1550-1554, vol. 35.
Qing-Ming Wang et al., “Nonlinear Piezoelectric Behavior of Ceramic Bending Mode Actuators Under Strong Electric Fields,” J. Applied Physics, 1999, pp. 3352-3360, vol. 86, No. 6.
Volkmar Mueller et al., “Nonlinearity and Scaling Behavior in Donor-Doped Lead Zirconate Titanate Piezoceramic,” Applied Physics Letters, 1998, pp. 2692-2694, vol. 72, No. 21.
Wei Ren et al., “Nonlinear Behavior of Piezoelectric Lead Zinc Niobate-Lead Titanate Single Crystals Under AC Electric Fields and DC Bias,” Applied Physics Letters, 2003, pp. 5268-5270, vol. 83, No. 25.
Maureen L. Mulvihill et al., “The Role of Processing Variables in the Flux Growth of Lead Zinc Niobate-Lead Titanate Relaxor Ferroelectric Single Crystals,” Jpn. J. Applied Phys., 1996, pp. 3984-3990, Part 1, vol. 35, No. 7.
Da-Ming Zhu et al., “Thermal Conductivity and Electromechanical Property of Single-Crystal Lead Magnesium Niobate Titanate,” Applied Physics Letters, 1999, pp. 3868-3870, vol. 75, No. 24.
Luo Hongyu
Martorano Christian
Shih Wan Y.
Shih Wei-Heng
Drexel University
King Roy
Knoble & Yoshida & Dunleavy LLC
Takeuchi Yoshitoshi
LandOfFree
Freestanding films with electric field-enhanced... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Freestanding films with electric field-enhanced..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Freestanding films with electric field-enhanced... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4241738