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9 Apr 2012

Volume 100, Issue 15, Articles (15xxxx)

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Appl. Phys. Lett. 100, 153701 (2012); http://dx.doi.org/10.1063/1.3700446 (3 pages)

Hsiao-lu D. Lee, Steffen J. Sahl, Matthew D. Lew, and W. E. Moerner
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Electrocaloric effect in low-crystallinity ferroelectric polymers

R. L. Moreira

Appl. Phys. Lett. 100, 152901 (2012); http://dx.doi.org/10.1063/1.3702781 (5 pages)

Online Publication Date: 9 April 2012

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The role of the sample crystallinity on the electrocaloric effect (ECE) of ferroelectric polymers was investigated in miscible blends of poly(vinylidene fluoride-trifluoroethylene) and poly(methyl methacrylate). Polarization switching measurements gave the electric field required to realize full dipole realignment. Conformational entropy and temperature changes were obtained from the thermal dependence of the dielectric permittivity in the paraelectric phase. The obtained ECE values were relatively high: they reached 18.6 J/kgK and 4.7 K for the pure copolymer and decreased ca. 74% for a 70% crystallinity decreasing. The sample crystallinity appears clearly as a key parameter controlling the ECE in non-oriented ferroelectric polymers.
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77.70.+a Pyroelectric and electrocaloric effects
61.41.+e Polymers, elastomers, and plastics
77.22.Ej Polarization and depolarization
77.22.Ch Permittivity (dielectric function)
77.80.Fm Switching phenomena

Phase transition and temperature stability of piezoelectric properties in Mn-modified Pb(Mg1/3Nb2/3)O3-PbZrO3-PbTiO3 ceramics

Yongke Yan, Ashok Kumar, Margarita Correa, Kyung-Hoon Cho, R. S. Katiyar, and Shashank Priya

Appl. Phys. Lett. 100, 152902 (2012); http://dx.doi.org/10.1063/1.3703124 (4 pages) | Cited 2 times

Online Publication Date: 12 April 2012

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This study investigates the effect of two different Mn modifiers [MnO2 and Pb(Mn1/3Nb2/3)O3(PMnN)] on the of phase transitions in Pb(Mg1/3Nb2/3)O3-PbZrO3-PbTiO3 ceramics. The temperature dependence of polarization derived from measured pyroelectric current indicated change in nature of phase transition with MnO2 doping. This phenomenon was supported by the temperature evolution of the linear softening of low lying hard lattice mode as revealed by Raman analysis. The grain size was found to increase with MnO2 doping (5X) while decrease with PMnN modification (0.5X). Interestingly, the piezoelectric constant of MnO2 modified composition showed negligible degradation (<1%) even after heat treatment very close to the ferroelectric-paraelectric transition temperature.
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77.65.Bn Piezoelectric and electrostrictive constants
77.80.bg Compositional effects
78.30.Hv Other nonmetallic inorganics
77.70.+a Pyroelectric and electrocaloric effects
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates

Scanning secondary-electron microscopy on ferroelectric domains and domain walls in YMnO3

J. Li, H. X. Yang, H. F. Tian, C. Ma, S. Zhang, Y. G. Zhao, and J. Q. Li

Appl. Phys. Lett. 100, 152903 (2012); http://dx.doi.org/10.1063/1.4704165 (3 pages) | Cited 1 time

Online Publication Date: 13 April 2012

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Ferroelectric domain structures in YMnO3 single crystals on the hexagonal polar surface have been investigated by scanning electron microscopy in secondary electron emission mode. The experimental results demonstrate that the domain, as well as domain walls, can be clearly revealed under the operation voltages ranging from 0.6 to 3 kV. Evolution of domain contrasts arising from electron-beam irradiation can be mainly explained by the pyroelectric effect and related charging process. A rich variety of microstructure features of ferroelectric domains can be clearly revealed in YMnO3 by this high-resolution technique.
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77.80.Dj Domain structure; hysteresis
79.20.Hx Electron impact: secondary emission
77.70.+a Pyroelectric and electrocaloric effects
61.80.Fe Electron and positron radiation effects
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