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18 Jul 2011

Volume 99, Issue 3, Articles (03xxxx)

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Appl. Phys. Lett. 99, 032501 (2011); http://dx.doi.org/10.1063/1.3610947 (3 pages)

G. X. Miao, M. D. Mascaro, C. H. Nam, C. A. Ross, and J. S. Moodera
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Complete set of material properties of single domain 0.24Pb(In1/2Nb1/2)O3-0.49Pb(Mg1/3Nb2/3)O3-0.27PbTiO3 single crystal and the orientation effects

Enwei Sun, Wenwu Cao, Wenhua Jiang, and Pengdi Han

Appl. Phys. Lett. 99, 032901 (2011); http://dx.doi.org/10.1063/1.3615684 (3 pages) | Cited 4 times

Online Publication Date: 20 July 2011

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Multidomain relaxor-based single crystals have intrigued the enthusiasm of many researchers due to their superior electromechanical properties. In order to understand the physical origin of multidomain properties, one must know the complete set of material coefficients in single domain state. Previous published single domain data were all measured under bias because single domain state is unstable. Here, we report a set of single domain data without bias for rhombohedral 0.24Pb(In1/2Nb1/2)O3-0.49Pb(Mg1/3Nb2/3)O3-0.27PbTiO3 single crystal. Comparing rotated coefficients from single domain data with measured multidomain material coefficients, we concluded that the orientation effects account for more than 90% of the observed multidomain properties.
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77.80.Jk Relaxor ferroelectrics
77.84.Cg PZT ceramics and other titanates

Energetics of hydrogen in GeO2, Ge, and their interfaces

Ka Xiong, Liang Lin, John Robertson, and Kyeongjae Cho

Appl. Phys. Lett. 99, 032902 (2011); http://dx.doi.org/10.1063/1.3610463 (3 pages) | Cited 4 times

Online Publication Date: 21 July 2011

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The energetics of interstitial hydrogen in GeO2, Ge, and their interfaces are calculated using a hybrid density functional. We find that interstitial atomic hydrogen unexpectedly behaves as a donor in GeO2, like H in ZnO but unlike H in SiO2. At Ge:GeO2 interfaces, the donor electron can transfer to the lower lying Ge conduction band, which stabilises the O-H bond/donor complex. This reduces the probability of passivating Ge dangling bond (Pb) centers at Ge:GeO2 interfaces.
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71.55.Ht Other nonmetals
61.72.jj Interstitials
71.15.Mb Density functional theory, local density approximation, gradient and other corrections

Experimental and theoretical investigation on the high frequency dielectric properties of Ag/Al2O3 composites

Z. C. Shi, R. H. Fan, Z. D. Zhang, H. Y. Gong, J. Ouyang, Y. J. Bai, X. H. Zhang, and L. W. Yin

Appl. Phys. Lett. 99, 032903 (2011); http://dx.doi.org/10.1063/1.3608156 (3 pages) | Cited 6 times

Online Publication Date: 21 July 2011

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The impedance and dielectric properties of Ag/Al2O3 composites are investigated experimentally in the frequency range from 100 MHz to 1 GHz. Besides, equivalent circuit analysis and numerical simulations were carried out. For the composites with sufficiently high silver loading, current paths were formed and negative permittivity appeared. The negative permittivity can be well described by lossy Drude model. Moreover, the negative permittivity sample manifests inductive characteristic and shunt inductors are added to its equivalent circuit. Numerical simulations show that the interconnection of silver particles results in negative permittivity, hence the serious attenuation of electromagnetic waves.
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77.22.Ch Permittivity (dielectric function)
72.30.+q High-frequency effects; plasma effects

Effect of domain walls on the electrocaloric properties of Pb(Zr1−x,Tix)O3 thin films

J. Karthik and L. W. Martin

Appl. Phys. Lett. 99, 032904 (2011); http://dx.doi.org/10.1063/1.3614453 (3 pages) | Cited 8 times

Online Publication Date: 22 July 2011

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The electrocaloric properties of polydomain epitaxial Pb(Zr1-x,Tix)O3 thin films are investigated using a Ginzburg-Landau-Devonshire thermodynamic model as a function of strain, temperature, and composition for 0.65 ≤ x ≤ 1. Polarization transitions driven by epitaxial strain and extrinsic contributions from domain wall displacements are found to dramatically impact the electrocaloric response. Careful choice of epitaxial misfit strain and composition allows one to harness the intrinsic and extrinsic contributions to obtain large adiabatic temperature changes much below the Curie temperature of the material.
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77.70.+a Pyroelectric and electrocaloric effects
77.80.Dj Domain structure; hysteresis
77.80.B- Phase transitions and Curie point
77.84.Cg PZT ceramics and other titanates
77.55.Kt Pyroelectric films
77.55.Px Epitaxial and superlattice films

The investigation of depoling mechanism of densified KNbO3 piezoelectric ceramic

Haiyan Ge, Yudong Hou, Xue Rao, Mankang Zhu, Hao Wang, and Hui Yan

Appl. Phys. Lett. 99, 032905 (2011); http://dx.doi.org/10.1063/1.3614541 (3 pages) | Cited 4 times

Online Publication Date: 22 July 2011

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Thermal depoling phenomena determine the upper temperature limit of the piezoelectric ceramics in application. In this paper, high-densified KNbO3 ceramics derived from single-crystalline nanostructures exhibited favorable piezoelectric constants d33, which varied from 105 to 80 pC/N over a broad temperature range from 25 to 225 °C. In situ x-ray diffraction combined with Raman spectra demonstrate clearly the transition sequence of crystallographic orientations during thermal depoling process. The interaction between defect dipoles D and spontaneous polarization inside domains Ps favored to preserve piezoelectric activity, while the spontaneous rotation of Ps induced by the phase transition resulted in the deliquesce of d33.
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77.84.Ek Niobates and tantalates
73.63.Bd Nanocrystalline materials
77.22.Ej Polarization and depolarization
77.65.Bn Piezoelectric and electrostrictive constants
78.67.Bf Nanocrystals, nanoparticles, and nanoclusters
81.05.Je Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides)
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