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5 Nov 2012

Volume 101, Issue 19, Articles (19xxxx)

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Appl. Phys. Lett. 101, 193101 (2012); http://dx.doi.org/10.1063/1.4764508 (4 pages)

Ryan T. Tucker, Allan L. Beaudry, Joshua M. LaForge, Michael T. Taschuk, and Michael J. Brett
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Large and temperature-independent piezoelectric response in Pb(Mg1/3Nb2/3)O3-BaTiO3-PbTiO3

Lizhu Huang, Guorong Li, Desheng Fu, Jiangtao Zeng, Wei Ruan, Liaoying Zheng, and Huarong Zeng

Appl. Phys. Lett. 101, 192901 (2012); http://dx.doi.org/10.1063/1.4765347 (3 pages)

Online Publication Date: 5 November 2012

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The temperature dependence of elastic, dielectric, and piezoelectric properties of (65−x)[Pb(Mg1/3Nb2/3)O3]–xBaTiO3-35PbTiO3 ceramics with x = 0, 1, 2, 3, and 4 was investigated. Compound with x = 2 was found to exhibit a large piezoelectric response (d31 ≈ −170 pC/N, d33 ≈ 530 pC/N at 300 K). Particularly, its d31 value was nearly a constant over a temperature range from 185 to 360 K. A broad ferroelectric phase transition tuned by BaTiO3 doping was deduced from the dielectric constant, elastic compliance constant, and Raman spectra. The temperature-stable piezoelectric response was attributed to the counter-balance of contributions from the dielectric and elastic responses.
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77.65.Bn Piezoelectric and electrostrictive constants
81.40.Jj Elasticity and anelasticity, stress-strain relations
62.20.dq Other elastic constants
77.80.B- Phase transitions and Curie point
77.84.Ek Niobates and tantalates
77.22.Ch Permittivity (dielectric function)

Role of measurement voltage on hysteresis loop shape in Piezoresponse Force Microscopy

E. Strelcov, Y. Kim, J. C. Yang, Y. H. Chu, P. Yu, X. Lu, S. Jesse, and S. V. Kalinin

Appl. Phys. Lett. 101, 192902 (2012); http://dx.doi.org/10.1063/1.4764939 (4 pages) | Cited 1 time

Online Publication Date: 7 November 2012

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The dependence of field-on and field-off hysteresis loop shape in Piezoresponse Force Microscopy (PFM) on driving voltage, Vac, is explored. A nontrivial dependence of hysteresis loop parameters on measurement conditions is observed. The strategies to distinguish between paraelectric and ferroelectric states with small coercive bias and separate reversible hysteretic and non-hysteretic behaviors are suggested. Generally, measurement of loop evolution with Vac is a necessary step to establish the veracity of PFM hysteresis measurements.
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77.80.Dj Domain structure; hysteresis
77.84.-s Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials
84.37.+q Measurements in electric variables (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.)

Single-crystalline BiFeO3 nanowires and their ferroelectric behavior

Shun Li, Riad Nechache, Catalin Harnagea, Liliya Nikolova, and Federico Rosei

Appl. Phys. Lett. 101, 192903 (2012); http://dx.doi.org/10.1063/1.4766343 (5 pages) | Cited 1 time

Online Publication Date: 8 November 2012

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We report the ferroelectric properties of single-crystalline BiFeO3 nanowires using piezoresponse force microscopy (PFM). The nanowires, synthesized by a hydrothermal approach, have a rhombohedral perovskite structure and a preferential growth of the (211) crystallographic plane perpendicular to the wire axis, as revealed by x-ray and electron diffraction investigations. PFM measurements reveal that the as-synthesized BiFeO3 nanowires, down to 40 nm in diameter, have components of spontaneous polarization along both the axial and radial directions, thereby demonstrating the ferroelectric nature of the wires. The results indicate that such ferroelectric BiFeO3 nanowires should provide promising opportunity for nanoscale nonvolatile memory devices.
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77.80.Dj Domain structure; hysteresis
77.84.Bw Elements, oxides, nitrides, borides, carbides, chalcogenides, etc.
61.46.Km Structure of nanowires and nanorods (long, free or loosely attached, quantum wires and quantum rods, but not gate-isolated embedded quantum wires)
81.07.Gf Nanowires
77.22.Ej Polarization and depolarization
77.65.-j Piezoelectricity and electromechanical effects

Excellent dielectric properties of anisotropic polymer composites filled with parallel aligned zinc flakes

Ye Zhang, Yao Wang, Yuan Deng, Yanjingtian Guo, Wencheng Bi, Mao Li, Yu Luo, and Jinbo Bai

Appl. Phys. Lett. 101, 192904 (2012); http://dx.doi.org/10.1063/1.4766923 (4 pages)

Online Publication Date: 8 November 2012

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Orderly polymer composites based on polyvinylidene fluoride assembled with parallel aligned zinc flakes were fabricated by a simple process. It is interesting to note that the microstructure of parallel arrangement could introduce excellent dielectric properties with obvious anisotropic dielectric behaviors. The dielectric constant in the parallel direction was obviously higher than that of the perpendicular direction. And the anisotropic intensity of interfacial polarization is proposed to interpret the anisotropic dielectric constant. Also, an equivalent circuit model of two parallel RC circuits in series, based on the analysis of impedance data, is employed to further discuss the anisotropic dielectric behavior.
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77.22.Ch Permittivity (dielectric function)
77.22.Ej Polarization and depolarization
77.84.Lf Composite materials
81.05.Qk Reinforced polymers and polymer-based composites
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