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16 Jul 2007

Volume 91, Issue 3, Articles (03xxxx)

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Appl. Phys. Lett. 91, 033106 (2007); http://dx.doi.org/10.1063/1.2757609 (3 pages)

S. Ingole, P. Aella, Sean J. Hearne, and S. T. Picraux
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Large remanent polarization in ferroelectric BiFeO3–PbTiO3 thin films on Pt/Si substrates

Mikael A. Khan, Tim P. Comyn, and Andrew J. Bell

Appl. Phys. Lett. 91, 032901 (2007); http://dx.doi.org/10.1063/1.2759256 (3 pages) | Cited 24 times

Online Publication Date: 18 July 2007

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Bismuth ferrite–lead titanate thin films in the region of the morphotropic phase boundary, with compositions of (1−x)BiFeO3–xPbTiO3 (0.3<x<0.5), were prepared by pulsed laser deposition on Pt/Si substrates. X-ray diffraction confirmed the formation of pure perovskite phase at a substrate temperature of 565 °C under 75 mTorr of oxygen. The films exhibit remanent polarizations with 2Pr up to 100 μC cm−2 for a field amplitude of 820 kV cm−1 and switchable polarization up to 80 μC cm−2.
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77.55.-g Dielectric thin films
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.22.Ej Polarization and depolarization
81.15.Fg Pulsed laser ablation deposition
68.55.A- Nucleation and growth

Correlation between number of ferroelectric variants and coercive field of lead ziconate titanate single crystals

S. Choudhury, L. Q. Chen, and Y. L. Li

Appl. Phys. Lett. 91, 032902 (2007); http://dx.doi.org/10.1063/1.2759274 (3 pages) | Cited 7 times

Online Publication Date: 18 July 2007

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Understanding the magnitude of coercive fields, the external electric field that results in zero net polarization, has been a long-standing problem for ferroelectrics. The authors studied the switching and coercive fields using a combination of the continuum phase field approach, microelasticity, and electrostatics. While the values of coercive fields predicted from the phenomenological thermodynamic theory assuming a single ferroelectric domain or the theory of nucleation are at least one order of magnitude too high compared to those measured experimentally, the predictions incorporating structural inhomogeneities show remarkably good agreement with experimental measurements, revealing the critical role of multidomain/variants in polarization switching.
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77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.80.Fm Switching phenomena
77.80.Dj Domain structure; hysteresis
77.22.Ej Polarization and depolarization
81.40.Jj Elasticity and anelasticity, stress-strain relations
62.20.D- Elasticity

Low temperature perovskite crystallization of 70%PbMg1/3Nb2/3O3–30%PbTiO3 thin films deposited by sputtering and their electrical performance evaluation

M. Detalle, D. Rémiens, G. Wang, P. Roussel, and B. Dkhil

Appl. Phys. Lett. 91, 032903 (2007); http://dx.doi.org/10.1063/1.2749859 (3 pages) | Cited 3 times

Online Publication Date: 19 July 2007

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PbMg1/3Nb2/3O3–PbTiO3 films were deposited on silicon by sputtering, followed by an annealing treatment. The authors demonstrate the pure perovskite phase may be obtained at very low temperature (400 °C) without any pyrochlore phase. The existence of an interfacial layer of Pb2Nb2O7 structure is evidenced. They suggest that such phase serves as seed layer which promotes the apparition of the perovskite phase. The permittivity of the films annealed at 450 °C is high (600) compared to most dielectric materials obtained at this temperature. The electromechanic properties (d33 = 50 pC/m) are also suitable for microelectromechanical system applications with a thermal treatment compatible with the above integrated circuits.
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68.55.A- Nucleation and growth
73.61.-r Electrical properties of specific thin films
64.70.K- Solid-solid transitions
81.15.Cd Deposition by sputtering
77.22.Ch Permittivity (dielectric function)
81.40.Gh Other heat and thermomechanical treatments

Aging effect and large recoverable electrostrain in Mn-doped KNbO3-based ferroelectrics

Zuyong Feng and Xiaobing Ren

Appl. Phys. Lett. 91, 032904 (2007); http://dx.doi.org/10.1063/1.2756355 (3 pages) | Cited 20 times

Online Publication Date: 19 July 2007

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KNbO3-based ferroelectrics have drawn much attention in recent years owing to their good piezoelectric performance among Pb-free piezoelectrics. However, little is known about the aging effect of these materials. In the present study, the authors systematically studied the aging effect of a Mn-doped (K0.99Li0.01)(Nb0.65Ta0.35)O3 ceramic with an aim to find an aging-induced recoverable electrostrain effect based on a reversible domain switching mechanism. They found that aging in the ferroelectric state made the otherwise normal hysteresis loop into a double loop, and more interestingly the aged sample demonstrated a large recoverable electrostrain of 0.125% at 4 kV/mm in an unpoled state. Such a behavior persisted up to 140 °C and showed good recoverability. The aging-induced double hysteresis and recoverable electrostrain suggest a reversible domain switching mechanism due to a symmetry-conforming short-range ordering of point defects. The striking similarity of the aging effect between acceptor-doped A+B5+O3 and acceptor-doped A2+B4+O3 systems indicates a common physical origin of aging.
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81.40.Cd Solid solution hardening, precipitation hardening, and dispersion hardening; aging
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.80.Fm Switching phenomena
77.80.Dj Domain structure; hysteresis
61.72.J- Point defects and defect clusters
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