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2 Jan 2012

Volume 100, Issue 1, Articles (01xxxx)

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Appl. Phys. Lett. 100, 013101 (2012); http://dx.doi.org/10.1063/1.3673334 (3 pages)

Patrice Genevet, Nanfang Yu, Francesco Aieta, Jiao Lin, Mikhail A. Kats, Romain Blanchard, Marlan O. Scully, Zeno Gaburro, and Federico Capasso
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Role of coexisting tetragonal regions in the rhombohedral phase of Na0.5Bi0.5TiO3-xat.%BaTiO3 crystals on enhanced piezoelectric properties on approaching the morphotropic phase boundary

Jianjun Yao, Niven Monsegue, Mitsuhiro Murayama, Weinan Leng, William T. Reynolds, Qinhui Zhang, Haosu Luo, Jiefang Li, Wenwei Ge, and D. Viehland

Appl. Phys. Lett. 100, 012901 (2012); http://dx.doi.org/10.1063/1.3673832 (4 pages) | Cited 10 times

Online Publication Date: 3 January 2012

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The ferroelectric domain and local structures of Na0.5Bi0.5TiO3-xat.%BaTiO3 (NBT-x%BT) crystals for x = 0, 4.5, and 5.5 have been investigated by transmission electron microscopy. The results show that the size of polar nano-regions was refined with increasing xat. %BT. The tetragonal phase volume fraction, as identified by in-phase octahedral tilting, was found to be increased with BT. The findings indicate that the large electric field induced strains in morphotropic phase boundary compositions of NBT-x%BT originate not only from polarization rotation but also polarization extension.
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77.65.Ly Strain-induced piezoelectric fields
77.84.Bw Elements, oxides, nitrides, borides, carbides, chalcogenides, etc.
77.80.Dj Domain structure; hysteresis
77.22.Ej Polarization and depolarization
61.66.Fn Inorganic compounds
81.16.-c Methods of micro- and nanofabrication and processing

Relaxor ferroelectric characteristics of Ba5LaTi3Nb7O30 tungsten bronze ceramics

Kun Li, Xiao Li Zhu, Xiao Qiang Liu, and Xiang Ming Chen

Appl. Phys. Lett. 100, 012902 (2012); http://dx.doi.org/10.1063/1.3673913 (4 pages) | Cited 6 times

Online Publication Date: 3 January 2012

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Ba5LaTi3Nb7O30 tungsten-bronze ferroelectric ceramics were synthesized and characterized. The tetragonal tungsten bronze structure in space group P4/mbm was confirmed, and a broad permittivity peak with strong frequency dispersion was observed around 250 K where the peak points well fitted the Vogel-Fulcher relationship [H. Vogel, Phys. Zeit. 22, 645 (1921); G. S. Fulcher, J. Am. Ceram. Soc. 8, 339 (1925)]. The temperature dependence of the ferroelectric hysteresis indicated the paraelectric to ferroelectric phase transition in the temperature range between 153 and 273 K. The high temperature permittivity curve deviated from the Curie-Weiss law in quite a narrow temperature region above Tmax, which reflected the weak correlations between the polar nanoregions. The Curie-Weiss constant (C) was 1.218 × 105 K, which was consistent with that for the displacive type ferroelectric. No DSC peak was detected over the temperature region investigated here. Moreover, the Curie-Weiss constant below Tmax (C′) was just two times of C, and the second order phase transition was confirmed for Ba5LaTi3Nb7O30.
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77.80.Jk Relaxor ferroelectrics
61.66.Fn Inorganic compounds
77.84.Ek Niobates and tantalates
77.22.Ch Permittivity (dielectric function)
77.80.B- Phase transitions and Curie point
77.80.Dj Domain structure; hysteresis

Size-dependent low-frequency dielectric properties in the BaTiO3/poly(vinylidene fluoride) nanocomposite films

Ben-Hui Fan, Jun-Wei Zha, Dongrui Wang, Jun Zhao, and Zhi-Min Dang

Appl. Phys. Lett. 100, 012903 (2012); http://dx.doi.org/10.1063/1.3673555 (4 pages) | Cited 7 times

Online Publication Date: 4 January 2012

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Effects of inorganic nanoparticles size and thermal agitation on dielectric properties of BaTiO3/poly(vinylidene fluoride) (BT/PVDF) nanocomposite films at low frequency were studied. The dielectric properties of the BT/PVDF nanocomposite films with three kinds of diameters of BT nanoparticles loading at 50 vol. % were studied in a wide frequency range from 10−2 Hz to 107 Hz by two measured processes. A significant low-frequency dielectric permittivity increase and the difference in dielectric properties between two measured processes were discussed. Interfacial polarization, crystal phase effect, and thermal agitation are considered to analyze the significant increase and difference in dielectric behaviors.
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77.22.Ch Permittivity (dielectric function)
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
77.22.Ej Polarization and depolarization
77.22.Gm Dielectric loss and relaxation
81.05.Qk Reinforced polymers and polymer-based composites

Biocompatible ferroelectric (Na,K)NbO3 nanofibers

A. Jalalian and A. M. Grishin

Appl. Phys. Lett. 100, 012904 (2012); http://dx.doi.org/10.1063/1.3673282 (4 pages)

Online Publication Date: 5 January 2012

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Dense homogeneous textile composed from continuous bead-free sodium potassium niobate (NKN) nanofibers 100 μm long and 50-200 nm in diameter was sintered by sol-gel calcination assisted electrospinning. High resolution electron microscopy and x-ray diffraction revealed preferential cube-on-cube growth of fibers in [001] direction. Raman spectrum of NKN fibers contains all the features characteristic to electrically poled orthorhombic phase. In contrast to polycrystalline ceramics, it shows relative enhancement of the Raman cross section of isotropic A1g(ν1) mode compared with polar axis defined F2g(ν5) and Eg(ν2) vibrations. We interpret this as an evidence for superparaelectric state of NKN nanofibers. Spontaneous polarization inside highly crystalline nanofiber exists at room temperature though big distance between fibers prevents the settling of a net macroscopic polarization.
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77.80.-e Ferroelectricity and antiferroelectricity
78.30.Hv Other nonmetallic inorganics
81.05.Je Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides)
81.16.-c Methods of micro- and nanofabrication and processing
61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)
77.22.Ej Polarization and depolarization
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