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2 Jul 2012

Volume 101, Issue 1, Articles (01xxxx)

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Appl. Phys. Lett. 101, 013701 (2012); http://dx.doi.org/10.1063/1.4730945 (5 pages)

Frederick Gertz, Rustam Azimov, and Alexander Khitun
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Piezoresponse properties of orderly assemblies of BaTiO3 and SrTiO3 nanocube single crystals

K. Mimura, K. Kato, H. Imai, S. Wada, H. Haneda, and M. Kuwabara

Appl. Phys. Lett. 101, 012901 (2012); http://dx.doi.org/10.1063/1.4731198 (4 pages) | Cited 2 times

Online Publication Date: 2 July 2012

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Orderly assemblies of BaTiO3 (BT) nanocubes, SrTiO3 (ST) nanocubes and BT-ST mixture nanocubes were fabricated on Pt-coated Si substrate directly by solution self-assembly and heated at 850 °C. The dielectric nanocubes aligned face to face in a quite wide region of several tens of square-micrometers with a height of one micrometer, and even inside of the structures was ordered. The piezoresponse of BT-ST mixture assembly showed non-linear curve and stepwise behavior at high poling field, which differed from ferroelectric BT and paraelectric ST nanocube assemblies.
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77.65.Bn Piezoelectric and electrostrictive constants
77.84.Cg PZT ceramics and other titanates
77.22.Ej Polarization and depolarization
81.16.Dn Self-assembly
61.46.Hk Nanocrystals
77.80.-e Ferroelectricity and antiferroelectricity

Enhanced piezoelectric properties of (Na0.5+y+zK0.5−y)(Nb1−xTax)O3 ceramics

Y. S. Sung, S. Baik, J. H. Lee, G. H. Ryu, D. Do, T. K. Song, M. H. Kim, and W. J. Kim

Appl. Phys. Lett. 101, 012902 (2012); http://dx.doi.org/10.1063/1.4732523 (4 pages) | Cited 4 times

Online Publication Date: 2 July 2012

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A- and B-site ratios in (Na0.5+y+zK0.5−y)(Nb1−xTax)O3 ceramics with ABO3 structure were investigated to differentiate the effects of polymorphic phase transition (PPT), morphotropic phase boundary (MPB), and Na nonstoichiometry on piezoelectric coefficient (d33). MPB was intrinsically determined by the ratio between Na and K, whereas PPT was extrinsically controlled by Ta substitution. PPT temperature between orthorhombic and tetragonal phases (TO−T) was reduced to room temperature at x = 0.45. d33 was increased to 310 pC/N at y = 0.03 and z = 0 by the combined effects of PPT and MPB and was further enhanced to 333 pC/N by the Na nonstoichiometry at z = 0.015 with improved density.
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77.84.Ek Niobates and tantalates
61.66.Bi Elemental solids
61.66.Dk Alloys
77.65.-j Piezoelectricity and electromechanical effects
81.30.Hd Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder
64.70.K- Solid-solid transitions

Enhanced high thermal conductivity and low permittivity of polyimide based composites by core-shell Ag@SiO2 nanoparticle fillers

Yongcun Zhou, Lu Wang, Hu Zhang, Yuanyuan Bai, Yujuan Niu, and Hong Wang

Appl. Phys. Lett. 101, 012903 (2012); http://dx.doi.org/10.1063/1.4733324 (4 pages) | Cited 1 time

Online Publication Date: 2 July 2012

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A kind of polymer based composites was prepared by embedding the fillers of core-shell Ag@SiO2 nanoparticles into the polyimide (PI) matrix. The obtained Ag@SiO2/PI (50% vf of fillers) composites show remarkably improved high thermal conductivity and low relative permittivity. The maximum value of the thermal conductivity of composites is 7.88 W/(mK) and the relative permittivity and dielectric loss are about 11.7 and 0.015 at 1 MHz, respectively. Compared with self-passivated nanometer Al* particles composites, core-shell Ag@SiO2 nano-composite is beneficial to increase the thermal conductivity and reduce the permittivity of the composites. The relative mechanism was studied and discussed.
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81.40.Rs Electrical and magnetic properties related to treatment conditions
66.70.Lm Other systems such as ionic crystals, molecular crystals, nanotubes, etc.
77.22.Ch Permittivity (dielectric function)
81.05.Qk Reinforced polymers and polymer-based composites

Material with high dielectric constant, low dielectric loss, and good mechanical and thermal properties produced using multi-wall carbon nanotubes wrapped with poly(ether sulphone) in a poly(ether ether ketone) matrix

Shuling Zhang, Hongsong Wang, Guibin Wang, and Zhenhua Jiang

Appl. Phys. Lett. 101, 012904 (2012); http://dx.doi.org/10.1063/1.4733723 (4 pages) | Cited 2 times

Online Publication Date: 2 July 2012

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A material with high dielectric constant, low dielectric loss, and good mechanical and thermal properties was produced using multi-wall carbon nanotubes (MWCNTs) wrapped with poly(ether sulphone) (PES) dispersed in a poly(ether ether ketone) (PEEK) matrix. The material was fabricated using melt-blending, and MWCNT/PEEK composites show different degrees of improvement in the measured dielectric, mechanical, and thermal properties as compared to pure PEEK. This is attributed to the high conductivity of MWCNTs, the effect of wrapping MWCNTs with PES, the good dispersion of the wrapped MWCNTs in PEEK, and the strong interfacial adhesion between the wrapped MWCNTs and the PEEK.
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81.05.Qk Reinforced polymers and polymer-based composites
81.40.Lm Deformation, plasticity, and creep
77.22.Gm Dielectric loss and relaxation
77.22.Ch Permittivity (dielectric function)
82.35.Gh Polymers on surfaces; adhesion
68.35.Np Adhesion

Impedance spectroscopy of the superprotonic conduction in LiH2PO4

Jin Jung Kweon, Kyu Won Lee, Cheol Eui Lee, Kwang-Sei Lee, and Y. J. Jo

Appl. Phys. Lett. 101, 012905 (2012); http://dx.doi.org/10.1063/1.4732790 (3 pages) | Cited 1 time

Online Publication Date: 3 July 2012

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Superprotonic conduction in the LiH2PO4 (LDP) system has been studied by means of impedance spectroscopy. A dielectric dispersion associated with room-temperature superionic conduction is manifested, as the temperature-dependent dielectric constant displays a broad peak shifting toward the high temperatures with increasing measuring frequency. In particular, our impedance spectroscopic analysis in distinct temperature ranges has revealed the evolution of the microscopic proton dynamics and inhomogeneous electric environments associated with the dynamics of the two distinct hydrogen-bond types in LDP.
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82.47.Aa Lithium-ion batteries
77.22.Ch Permittivity (dielectric function)

Frequency-dependent dielectric response model for polyimide-poly(vinilydenefluoride) multilayered dielectrics

Luigi Di Lillo, Andrea Bergamini, Dario Albino Carnelli, and Paolo Ermanni

Appl. Phys. Lett. 101, 012906 (2012); http://dx.doi.org/10.1063/1.4731763 (4 pages)

Online Publication Date: 3 July 2012

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A physical model for the frequency-dependent dielectric response of multilayered structures is reported. Two frequency regimes defined by the relative permittivities and volume resistivities of the layers have been analytically identified and experimentally investigated on a structure consisting of polyimide and poly(vinilydenefluoride) layers. The relative permittivity follows an effective medium model at high frequency while showing a dependence on the volume resistivity at low frequency. In this regime, relative permittivities exceeding those expected from effective medium model are recorded. These findings provide insights into inhomogeneous dielectrics behavior for the development of high energy density dielectric films.
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81.05.Lg Polymers and plastics; rubber; synthetic and natural fibers; organometallic and organic materials
77.84.Jd Polymers; organic compounds
77.55.-g Dielectric thin films
77.22.Ch Permittivity (dielectric function)
73.61.Ph Polymers; organic compounds

Anisotropic electrical properties in bismuth layer structured dielectrics with natural super lattice structure

Takashi Kojima, Junichi Kimura, Muneyasu Suzuki, Kenji Takahashi, Takahiro Oikawa, Yukio Sakashita, Kazumi Kato, Takayuki Watanabe, Tadashi Takenaka, Tomoaki Yamada, and Hiroshi Funakubo

Appl. Phys. Lett. 101, 012907 (2012); http://dx.doi.org/10.1063/1.4733326 (4 pages)

Online Publication Date: 5 July 2012

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Dielectric property of epitaxial SrBi4Ti4O15 thin films with (001)-, (1110)-, (105)/(015)-, and (100)/(010)-orientations was investigated as a function of film thickness. As the tilting angle of c-axis from the surface normal is smaller, the relative dielectric constant begins to degrade at thinner thickness; eventually, the (001)-oriented films for which the c-axis is vertical to the substrate do not show noticeable degradation. The leakage current density also strongly depends of the tilting angle of the c-axis. The results indicate that the layer structure of SrBi4Ti4O15 exhibits a small size effect with high insulation performance.
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77.55.Px Epitaxial and superlattice films
73.61.Ng Insulators
77.22.Ch Permittivity (dielectric function)

Magnetoelectric properties of flexible BiFeO3/Ni tapes

L. Yan, M. Zhuo, Z. Wang, J. Yao, N. Haberkorn, S. Zhang, L. Civale, J. Li, D. Viehland, and Q. X. Jia

Appl. Phys. Lett. 101, 012908 (2012); http://dx.doi.org/10.1063/1.4731780 (4 pages)

Online Publication Date: 5 July 2012

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We report ferroelectric (FE), ferromagnetic, and magnetoelectric (ME) properties of BiFeO3 films directly deposited on flexible magnetic Ni tapes. Without use of metal-oxide and/or noble metal buffer layer between the BiFeO3 and the Ni, both ferroelectric and magnetic properties of the film and the substrate are preserved. X-ray diffraction and transmission electron microscopy analyses confirm the formation of preferentially oriented (110) BiFeO3 film on Ni tapes. The BiFeO3 film has a saturation polarization and a piezoelectric d33 coefficient of 69 μC/cm2 and 52 pm/V, respectively. The BiFeO3/Ni tape shows a magnetoelectric coefficient of 3.5 mV/cm·Oe.
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75.85.+t Magnetoelectric effects, multiferroics
77.55.H- Piezoelectric and electrostrictive films
77.55.Nv Multiferroic/magnetoelectric films
77.22.Ej Polarization and depolarization
75.70.Ak Magnetic properties of monolayers and thin films
77.65.Bn Piezoelectric and electrostrictive constants

A shear-bending mode high temperature piezoelectric actuator

Jianguo Chen, Xiaotian Li, Guoxi Liu, Zhijiang Chen, and Shuxiang Dong

Appl. Phys. Lett. 101, 012909 (2012); http://dx.doi.org/10.1063/1.4730326 (4 pages) | Cited 1 time

Online Publication Date: 6 July 2012

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A single ring-shape ceramic plate piezoelectric actuator operated in shear-bending mode was proposed for high-temperature operation. The actuator was formed from BiScO3-PbTiO3 ceramic and polarized in the radial direction. A large bending displacement at the center of the actuator was piezoelectrically generated under an applied voltage in the thickness direction due to axial-symmetric shear strain of the ring-shape configuration. The displacement obtained at 200 °C was about 20 μm, 11–14 times that of a normal piezoelectric plate of identical size.
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85.50.-n Dielectric, ferroelectric, and piezoelectric devices

Nonlinear conductance quantization effects in CeOx/SiO2-based resistive switching devices

E. Miranda, S. Kano, C. Dou, K. Kakushima, J. Suñé, and H. Iwai

Appl. Phys. Lett. 101, 012910 (2012); http://dx.doi.org/10.1063/1.4733356 (4 pages) | Cited 2 times

Online Publication Date: 6 July 2012

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The electron transport in W/CeOx/SiO2/NiSi2 resistive switching devices fabricated onto a p+-type Si substrate is investigated. It is shown that the structures exhibit bipolar switching with conductance values in the low resistance state (LRS) close to integer and half integer values of the quantum unit G0 = 2e2/h, e and h being the electron charge and Planck constant, respectively. This behavior is consistent with the so-called nonlinear conduction regime in quantum point-contacts. A simple model for the LRS current-voltage characteristic based on the finite-bias Landauer formula which accounts for the right- and left-going conduction modes dictated by the constriction’s cross-section area and the voltage drop distribution along the filamentary path is reported.
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84.30.Sk Pulse and digital circuits
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