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31 May 2004

Volume 84, Issue 22, pp. 4361-4576

Issue Cover Spotlight Figure

Appl. Phys. Lett. 84, 4409 (2004); http://dx.doi.org/10.1063/1.1757648 (3 pages)

Azita Soleymani, Piroz Zamankhan, and William Polashenski
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All-organic dielectric-percolative three-component composite materials with high electromechanical response

Cheng Huang, Q. M. Zhang, Gal deBotton, and Kaushik Bhattacharya

Appl. Phys. Lett. 84, 4391 (2004); http://dx.doi.org/10.1063/1.1757632 (3 pages) | Cited 54 times

Online Publication Date: 12 May 2004

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By combining the high-dielectric copper phthalocyanine oligomer (PolyCuPc) and conductive polyanline (PANI) within polyurethane (PU) matrix an all-organic three-component dielectric-percolative composite with high dielectric constant is demonstrated. In this three-component composite system, the high-dielectric-constant PolyCuPc particulates enhance the dielectric constant of the PU matrix and this combined two-component dielectric matrix in turn serves as the high-dielectric-constant host for the PANI to realize percolative phenomenon and further enhance the dielectric response. As a result, an electromechanical strain of 9.3% and elastic energy density of 0.4 J/cm3 under an electric field of 20 V/μm can be induced. © 2004 American Institute of Physics.
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77.84.Lf Composite materials
77.55.-g Dielectric thin films
77.22.Ch Permittivity (dielectric function)
77.22.Gm Dielectric loss and relaxation
68.60.Bs Mechanical and acoustical properties
81.40.Jj Elasticity and anelasticity, stress-strain relations
62.20.D- Elasticity

Dielectric characterization of Bi3.25La0.75Ti3O12 thin films

Di Wu, Aidong Li, and Naiben Ming

Appl. Phys. Lett. 84, 4505 (2004); http://dx.doi.org/10.1063/1.1757631 (3 pages) | Cited 23 times

Online Publication Date: 14 May 2004

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Dielectric properties of Pt/Bi3.25La0.75Ti3O12(BLaT)/Pt ferroelectric thin film capacitors were studied as functions of frequency (40–106 Hz) and temperature (30–590 °C). BLaT thin films showed a first-order para-ferroelectric transition around 400 °C. Pt/BLaT/Pt capacitors post-annealed in Ar exhibited broadened transition with larger losses, which was interpreted in terms of increased oxygen vacancies. Via complex impedance spectroscopy study, the conduction activation energy of the space charges was determined to be ∼ 1.1 eV, close to that of oxygen vacancies in perovskite materials. The impedance characteristics of Pt/BLaT/Pt were compared with those of Pt/SrBi2Ta2O9(SBT)/Pt capacitors. The impact of dielectric characteristics on fatigue resistance of BLaT films was briefly discussed in comparison with SBT films. © 2004 American Institute of Physics.
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84.32.Tt Capacitors
85.50.-n Dielectric, ferroelectric, and piezoelectric devices
77.22.Ch Permittivity (dielectric function)
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.22.Jp Dielectric breakdown and space-charge effects
77.80.Dj Domain structure; hysteresis
81.40.Gh Other heat and thermomechanical treatments
77.80.B- Phase transitions and Curie point
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