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14 Dec 2009

Volume 95, Issue 24, Articles (24xxxx)

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Appl. Phys. Lett. 95, 242102 (2009); http://dx.doi.org/10.1063/1.3272858 (3 pages)

W. H. Lim, F. A. Zwanenburg, H. Huebl, M. Möttönen, K. W. Chan, A. Morello, and A. S. Dzurak
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Ferroelectric polymer/silver nanocomposites with high dielectric constant and high thermal conductivity

Xingyi Huang, Pingkai Jiang, and Liyuan Xie

Appl. Phys. Lett. 95, 242901 (2009); http://dx.doi.org/10.1063/1.3273368 (3 pages) | Cited 14 times

Online Publication Date: 14 December 2009

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Ferroelectric polymer nanocomposites with silver (Ag) nanoparticles as inclusions were prepared and the dielectric properties and thermal conductivity were studied. The results showed that the nanocomposites have high dielectric constant and high thermal conductivity. When the loading level of Ag nanoparticles is 20.0 vol %, the dielectric constant and thermal conductivity of the nanocomposites were 120 at 103 Hz and 6.5 W/mK, respectively. Our results also showed that there is no percolation in the nanocomposites when Ag loading range is within 20.0%.
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77.22.Ch Permittivity (dielectric function)
66.70.Lm Other systems such as ionic crystals, molecular crystals, nanotubes, etc.
61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)
81.16.-c Methods of micro- and nanofabrication and processing
77.80.-e Ferroelectricity and antiferroelectricity
77.84.Lf Composite materials

Polarization switching characteristics of BiFeO3 thin films epitaxially grown on Pt/MgO at a low temperature

Sangwoo Ryu, Jong Yeog Son, Young-Han Shin, Hyun M. Jang, and James F. Scott

Appl. Phys. Lett. 95, 242902 (2009); http://dx.doi.org/10.1063/1.3275012 (3 pages) | Cited 7 times

Online Publication Date: 17 December 2009

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An [001]-oriented BiFeO3 (BFO) thin film having a pseudotetragonal symmetry was epitaxially grown on a Pt/MgO (001) substrate. The Pt-buffered MgO substrate enabled us to fabricate an epitaxial heterostructure at a temperature as low as 500 °C. We examined three major criteria for high-density ferroelectric memories using this BFO/Pt film capacitor. The polarization switching experiment has demonstrated that the film is electrically fatigue-free and possesses stable charge-retention characteristics with a reasonably large sensing margin of 22 μC/cm2. These suggest potential applicability of the present BFO/Pt heteroepitaxial film capacitor to nonvolatile memories.
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77.80.Fm Switching phenomena
77.84.Bw Elements, oxides, nitrides, borides, carbides, chalcogenides, etc.
85.50.Gk Non-volatile ferroelectric memories
77.22.Ej Polarization and depolarization
84.32.Tt Capacitors
81.15.Cd Deposition by sputtering

Predicted cooling powers for multilayer capacitors based on various electrocaloric and electrode materials

S. Kar-Narayan and N. D. Mathur

Appl. Phys. Lett. 95, 242903 (2009); http://dx.doi.org/10.1063/1.3275013 (3 pages) | Cited 16 times

Online Publication Date: 17 December 2009

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We argue that the multilayer capacitor (MLC) geometry is ideal for electrocaloric cooling. Thermal modeling predicts that a commercially available MLC, which serendipitously shows electrocaloric effects, could constitute the heart of an idealized heat pump delivering a continuous cooling power of 22.5 W kg−1. This figure could be increased via materials optimization to ∼ 2875 W kg−1, such that an MLC array whose sheet area is just ∼ 0.56 m2 would deliver the ∼ 20 kW cooling power of typical air-cooled chillers for air-conditioning at residential and commercial sites. Expensive materials are not required, and performance could be further enhanced via geometrical improvements.
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84.32.Tt Capacitors
77.70.+a Pyroelectric and electrocaloric effects
82.45.Fk Electrodes

Ferroelectricity triggered in the quantum paraelectric AgTaO3 by Li-substitution

Hwee Ping Soon, Hiroki Taniguchi, and Mitsuru Itoh

Appl. Phys. Lett. 95, 242904 (2009); http://dx.doi.org/10.1063/1.3275750 (3 pages)

Online Publication Date: 17 December 2009

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Ferroelectricity has been induced in the quantum paraelectric AgTaO3 (AT) by Li+ substitution, as evidence by both the dielectric anomaly and the hysteretic loop of electrical displacement versus applied electric field. The transition temperature (Tc) of Li-doped AT was found to increase with increasing level of Li+ substitution. Also, by substituting 12 mol % of Li+ into AT, which is close to the solubility limit, a ferroelectric material with a residual polarization ∼ 15 μC/cm2 and Tc at 258 K was then triggered.
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77.80.Dj Domain structure; hysteresis
77.80.B- Phase transitions and Curie point
77.22.Ej Polarization and depolarization
64.75.Bc Solubility

Nanoparticle surface modification induced space charge suppression in linear low density polyethylene

Xingyi Huang, Pingkai Jiang, and Yi Yin

Appl. Phys. Lett. 95, 242905 (2009); http://dx.doi.org/10.1063/1.3275732 (3 pages) | Cited 6 times

Online Publication Date: 18 December 2009

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This letter reports the role of nanoparticle surface modification in affecting the space charge distribution of polyethylene/silica nanocomposite dielectrics. Space charge distribution in the nanocomposites was measured using a pulsed electroacoustic method. The results suggested that the nanoparticle surface modification has significant effects on the space charge behaviors in polyethylene and that the nanocomposites with surface-treated silica showed improved space charge distribution, which can be understood in terms of the morphological variation of the matrix and the better interfacial adhesion between the surface-treated nanoparticles and the matrix.
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61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)
77.22.Jp Dielectric breakdown and space-charge effects
72.50.+b Acoustoelectric effects

Surface acoustic wave propagation properties in 0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3 single crystal poled along [111]c

Xiuming Li, Rui Zhang, Naixing Huang, Tianquan Lü, and Wenwu Cao

Appl. Phys. Lett. 95, 242906 (2009); http://dx.doi.org/10.1063/1.3271775 (3 pages)

Online Publication Date: 18 December 2009

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Surface acoustic wave (SAW) propagation properties in relaxor-based 0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3 (PMN-33%PT) ferroelectric single crystals poled along [111]c has been analyzed theoretically. We found that the X-cut PMN-33%PT has lower phase velocity and higher electromechanical coupling coefficient compared to traditional piezoelectric materials. The power flow angle (PFA) can be zero in specific directions, which could drastically improve the performance of SAW devices. Our theoretical results indicate that the direction about 5° canted from [111]c is the optimum direction for the X-cut [111]c poled crystals in SAW device applications. Characteristic curves were also obtained for the phase velocity, electromechanical coupling coefficient, and PFA in Z-cut single-domain PMN-33%PT single crystals.
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68.35.Iv Acoustical properties
62.65.+k Acoustical properties of solids
77.65.-j Piezoelectricity and electromechanical effects
77.80.B- Phase transitions and Curie point
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