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6 Aug 2012

Volume 101, Issue 6, Articles (06xxxx)

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Appl. Phys. Lett. 101, 062401 (2012); http://dx.doi.org/10.1063/1.4730997 (4 pages)

Mahdi Jamali, Kulothungasagaran Narayanapillai, Jae Hyun Kwon, and Hyunsoo Yang
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Investigation of the dielectric, elastic, and piezoelectric properties of Cs2TeMo3O12 crystals

Junjie Zhang, Zeliang Gao, Xin Yin, Zhonghan Zhang, Youxuan Sun, and Xutang Tao

Appl. Phys. Lett. 101, 062901 (2012); http://dx.doi.org/10.1063/1.4742735 (4 pages) | Cited 1 time

Online Publication Date: 6 August 2012

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The complete sets of dielectric, elastic, and piezoelectric constants of Cs2TeMo3O12 crystals at room temperature were determined by means of the resonant technique and impedance analysis. The piezoelectric strain constants d33 and d15 were on the order of 20.3 and 29.2 pC/N, respectively, with the electromechanical coupling coefficients being k33 = 36.6% and k15 = 14.3%. Moreover, temperature dependence of the electro-elastic coefficients was measured in the range of 0–150 °C, where the elastic constant s44 was found to possess relatively low temperature coefficient (Ts44(1) = 77 × 10−6/ °C), and the variations of d33 and k33 were less than 3.5% and 1.0%, respectively.
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77.65.-j Piezoelectricity and electromechanical effects
77.84.-s Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials
81.40.Jj Elasticity and anelasticity, stress-strain relations
62.20.dq Other elastic constants
77.22.Ch Permittivity (dielectric function)

Nonpolar resistive switching in Mn-doped BiFeO3 thin films by chemical solution deposition

J. M. Luo, S. P. Lin, Yue Zheng, and B. Wang

Appl. Phys. Lett. 101, 062902 (2012); http://dx.doi.org/10.1063/1.4742897 (5 pages) | Cited 1 time

Online Publication Date: 6 August 2012

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Nanoscale Mn-doped BiFeO3 (BFMO) films are prepared by chemical solution deposition on Pt/Ti/SiO2/Si substrates. Nonpolar nonvolatile resistive switching has been observed in Pt/BFMO/Pt structure. Analysis of the current-voltage relationship demonstrates that the space-charge-limited current conduction controlled by the localized traps should be of great importance to the resistance switching. X-ray photoelectron spectroscopy results suggest that the coexistence of Fe2+ and Fe3+ can be ascribed to the relatively oxygen vacancies. According to defect chemistry, the valence variation between Fe2+ and Fe3+ determined by the neutralization/ionization of oxygen vacancies is supposed to play a crucial role in conductive filament-related nonpolar resistive switching.
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72.20.Ht High-field and nonlinear effects
73.40.Rw Metal-insulator-metal structures
73.50.Fq High-field and nonlinear effects
73.61.Ng Insulators
81.15.Lm Liquid phase epitaxy; deposition from liquid phases (melts, solutions, and surface layers on liquids)
68.55.Ln Defects and impurities: doping, implantation, distribution, concentration, etc.

Piezoelectricity and local structural distortions in (Na0.5Bi0.5)1−xSrxTiO3-Bi12TiO20 flexoelectric-type polar ceramics

L. H. Wang, M. L. Zhao, C. L. Wang, J. Wang, W. J. Kuai, and X. T. Tao

Appl. Phys. Lett. 101, 062903 (2012); http://dx.doi.org/10.1063/1.4744952 (4 pages) | Cited 1 time

Online Publication Date: 7 August 2012

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We have previously described sintered Na0.5Bi0.5TiO3-Bi12TiO20 composites as flexoelectric-type polar ceramics because they have a net macroscopic flexoelectric polarization. Here, we report on the universal existence of the macroscopic flexoelectric polarization in the (Na0.5Bi0.5)1−xSrxTiO3-Bi12TiO20 system, in which enhanced piezoelectricity is observed. By combining Raman spectroscopy and x-ray photoelectron spectroscopy techniques, we have identified the local flexoelectric polarization as distorted BiO5 polyhedra and TiO6 octahedra in the SrTiO3-Bi12TiO20 ceramic. The macroscopic polarization may be due to the partial alignment of these distorted units located within the grain boundary amorphous phases. Bi12TiO20 could have an important role in these flexoelectric-type polar ceramics.
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77.65.-j Piezoelectricity and electromechanical effects
77.84.Lf Composite materials
78.35.+c Brillouin and Rayleigh scattering; other light scattering
79.60.Ht Disordered structures
82.80.Pv Electron spectroscopy (X-ray photoelectron (XPS), Auger electron spectroscopy (AES), etc.)
77.22.Ej Polarization and depolarization

In situ structure characterization of Pb(Yb1/2Nb1/2)O3-PbTiO3 crystals under high pressure-temperature

Lingping Kong, Luhong Wang, Shujun Zhang, Oliver Tschauner, Yusheng Zhao, Wenge Yang, Haozhe Liu, and Ho-kwang Mao

Appl. Phys. Lett. 101, 062904 (2012); http://dx.doi.org/10.1063/1.4742165 (4 pages)

Online Publication Date: 7 August 2012

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The stability field of the piezoelectric/ferroelectric phase of solid solution 0.47Pb(Yb1/2Nb1/2)O3-0.53PbTiO3 (PYN-PT) has been studied using in situ x-ray diffraction (XRD) and Raman spectroscopy techniques under high pressure and high temperature conditions to observe the evolution of features. PYN-PT remains in the piezoelectric tetragonal phase up to approximately 6.5 GPa at room temperature then transforms to a paraelectric cubic phase, which exhibits local disorder. The cubic phase is stable up to 50 GPa. Based on the high pressure and high temperature XRD results, we present a pressure-temperature phase diagram of PYN-PT which constraints the stability region of the ferroelectric phase.
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62.50.-p High-pressure effects in solids and liquids
64.70.K- Solid-solid transitions
77.80.B- Phase transitions and Curie point
61.66.Fn Inorganic compounds
77.65.-j Piezoelectricity and electromechanical effects
78.30.Hv Other nonmetallic inorganics

Low dielectric permittivity and high thermal conductivity silicone rubber composites with micro-nano-sized particles

Jun-Wei Zha, Yan-Hui Zhu, Wei-Kang Li, Jinbo Bai, and Zhi-Min Dang

Appl. Phys. Lett. 101, 062905 (2012); http://dx.doi.org/10.1063/1.4745509 (4 pages) | Cited 1 time

Online Publication Date: 8 August 2012

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Compared with the inorganic particles/silicone rubber (IOP/SR) composites filled with single-sized particle solely, the IOP/SR composites cofilled with micro-sized Si3N4 and nano-sized Al2O3 particles show a low relative dielectric permittivity (5.25) and high thermal conductivity (1.62 W m−1K−1), which are a bit higher than the permittivity (4.1) and remarkably larger than the thermal conductivity (0.16 W m−1K−1) of pure SR. Agari model gives a better prediction for these results. The images indicate that the nano-sized Al2O3 particles are closely filled into the gaps between the micro-sized Si3N4 particles and play a role as a bridge-link action to form a continuous thermally conductive network. This also confirms that the loading of the micro-sized Si3N4 particles in the SR composites prepared by the cofilled model contributes a positive thermal conduction and induces the low dielectric permittivity of the IOP/SR composites.
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77.22.Ch Permittivity (dielectric function)
77.84.Lf Composite materials
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)

Enhanced antiferroelectric and electric-induced pyroelectric properties of Mn-substitued (Pb0.832Ba0.138La0.02)(Zr0.7Ti0.05Sn0.25)O3 ceramics

Qingfeng Zhang, Maoyan Fan, Shenglin Jiang, Tongqing Yang, and Xi Yao

Appl. Phys. Lett. 101, 062906 (2012); http://dx.doi.org/10.1063/1.4744948 (4 pages) | Cited 2 times

Online Publication Date: 8 August 2012

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(Pb0.832Ba0.138La0.02)(Zr0.7Ti0.05Sn0.25)O3 ceramics with stable antiferroelectric phase at room temperature were fabricated by Mn doping. The enhancement of antiferroelectric phase is attributed that the substitution of Mn ion into the B site decreased tolerance factor of the ceramics. The largest pyroelectric figure of merit of 25 × 10−5 Pa−0.5 was obtained in (Pb0.832Ba0.138La0.02)(Zr0.7Ti0.05Sn0.25)O3 antiferroelectric ceramics with 0.2 mol. % Mn doping, which is far higher than that of convention phase transition materials. The increase of the pyroelectric response was attributed to the improvement in dc field-induced dielectric enhancement effect and the reduction in dielectric loss.
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77.84.Cg PZT ceramics and other titanates
77.80.bg Compositional effects
77.22.Gm Dielectric loss and relaxation
77.70.+a Pyroelectric and electrocaloric effects

Orientation and phase transition dependence of the electrocaloric effect in 0.71PbMg1/3Nb2/3O3-0.29PbTiO3 single crystal

Laihui Luo, Matthias Dietze, Claus-Henning Solterbeck, Mohammed Es-Souni, and Haosu Luo

Appl. Phys. Lett. 101, 062907 (2012); http://dx.doi.org/10.1063/1.4745185 (4 pages) | Cited 1 time

Online Publication Date: 8 August 2012

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In this letter, the electrocaloric effect (ECE) of 〈111〉- and 〈001〉-oriented 0.71PbMg1/3Nb2/3O3-0.29PbTiO3 (0.71PMN-0.29PT) single crystals is investigated with emphasis on the effects of phase transitions and their dependence on electric field. We show that crystal orientation and more specifically the complex phase transitions taking place in the specific composition above have large effects on the maximum ECE temperature, ΔTmax, its peak temperature, TEC, and the width of the ECE peak of the ΔT(T) curve. The investigation shows that ECE may be tuned by a proper choice of 0.71PMN-0.29PT crystal orientations.
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77.70.+a Pyroelectric and electrocaloric effects
77.80.B- Phase transitions and Curie point
61.66.Fn Inorganic compounds

Fractional power-law spectral response of CaCu3Ti4O12 dielectric: Many-body effects

Jitender Kumar and A. M. Awasthi

Appl. Phys. Lett. 101, 062908 (2012); http://dx.doi.org/10.1063/1.4745784 (3 pages) | Cited 2 times

Online Publication Date: 9 August 2012

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Spectral character of dielectric response in CaCu3Ti4O12 across 0.5 Hz–4MHz over 45–200 K corresponding to neither the Debyean nor the KWW relaxation patterns rather indicates a random-walk like diffusive dynamics of moments. Non-linear relaxation here is due to the many body dipole-interactions, as confirmed by spectral-fits of our measured permittivity to the Dissado-Hill behaviour. Fractional power-laws observed in ε*(ω) macroscopically reflect the fractal microscopic configurations. Below ∼100 K, the power-law exponent m (n) steeply decreases (increases), indicating finite length-scale collective response of moment-bearing entities. At higher temperatures, m gradually approaches 1 and n falls to low values, reflecting tendency towards the single-particle/Debyean relaxation.
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77.22.Ch Permittivity (dielectric function)
77.84.-s Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials
72.20.Jv Charge carriers: generation, recombination, lifetime, and trapping
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