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14 Jul 2008

Volume 93, Issue 2, Articles (02xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 93, 023303 (2008); http://dx.doi.org/10.1063/1.2953179 (3 pages)

Takafumi Kawanishi, Takaaki Fujiwara, Megumi Akai-Kasaya, Akira Saito, Masakazu Aono, Junichi Takeya, and Yuji Kuwahara
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A nanoscale analysis of the leakage current in SiO2 breakdown

Gang Zhang, Xiang Li, Chih-Hang Tung, Kin-Leong Pey, and Guo-Qiang Lo

Appl. Phys. Lett. 93, 022901 (2008); http://dx.doi.org/10.1063/1.2957657 (3 pages) | Cited 5 times

Online Publication Date: 14 July 2008

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In this work, we provide a nanoscale scheme of the leakage current in SiO2 breakdown. In combination with first-principles calculation, the leakage current is explored with the Landauer–Büttiker transport formula. Large leakage current is generated from the band gap states. The effect of oxygen vacancy is remarkable in the conduction band while almost negligible in the valence band. Our results predict that in a nanoscale metal oxide semiconductor (MOS) field-effect transistor, the leakage current in p-MOS devices is much smaller than that in n-MOS devices.
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77.22.Jp Dielectric breakdown and space-charge effects
61.72.jd Vacancies
71.20.Ps Other inorganic compounds
85.30.Tv Field effect devices
73.40.Qv Metal-insulator-semiconductor structures (including semiconductor-to-insulator)

Enhanced magnetoelectric coefficient (α) in the modified BiFeO3–PbTiO3 system with large La substitution

Anupinder Singh, Arti Gupta, and Ratnamala Chatterjee

Appl. Phys. Lett. 93, 022902 (2008); http://dx.doi.org/10.1063/1.2945638 (3 pages) | Cited 15 times

Online Publication Date: 17 July 2008

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Magnetoelectric coupling coefficient (α) values of 0.88 mV/cm/Oe at 200 Oe and magnetocapacitive effects are reported in solid-solution BF–LF–PT with large La substitution (50:50 in BF). Enhancement of magnetic, dielectric, and ferroelectric properties is also observed. The solid solution shows relaxor behavior with large permittivity values ( ∼ 30 000), large remnant polarization ( ∼ 61 μC/cm2), and symmetric but nonsaturating M-H loop with Mr ∼ 0.25 emu/g.
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75.80.+q Magnetomechanical effects, magnetostriction
77.22.Ch Permittivity (dielectric function)
77.80.-e Ferroelectricity and antiferroelectricity
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
82.30.Hk Chemical exchanges (substitution, atom transfer, abstraction, disproportionation, and group exchange)

Electromechanical response of 1-3 piezoelectric composites with hollow fibers

C. Marcheselli and T. A. Venkatesh

Appl. Phys. Lett. 93, 022903 (2008); http://dx.doi.org/10.1063/1.2944266 (3 pages) | Cited 3 times

Online Publication Date: 18 July 2008

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A finite element model is developed to characterize the complete electromechanical response of piezoelectric composite materials with hollow fibers and to obtain a quantitative assessment of the relative effects of the introduction of porosity and a piezoelectric second phase in a piezoelectric matrix material. Fifteen characteristic composites are identified for each of the two model ceramic-based and polymer-based matrix systems (i.e., barium titanate and polyvinylidine difluoride) by systematically varying the volume fractions of porosity and the second phase (i.e., lead zirconate titanate). It is demonstrated that the fundamental properties and the piezoelectric figures of merit of the piezoelectric composites generally exhibit greater sensitivity to the presence of porosity in the electroelastically stiffer ceramic-based systems while the piezoelectrically active second phase has a dominant influence in the electroelastically compliant polymer-based systems.
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77.65.-j Piezoelectricity and electromechanical effects
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
81.40.Jj Elasticity and anelasticity, stress-strain relations
62.20.D- Elasticity

Dielectric and piezoelectric properties of (1−x)(Bi1−yLiy)(Sc1−ySby)O3–xPbTiO3 high-temperature relaxor ferroelectric ceramics

Yihang Jiang, Yi Zhao, Baoquan Qin, Yuzhi Jiang, Wei Shi, Lihua Li, Dingquan Xiao, and Jianguo Zhu

Appl. Phys. Lett. 93, 022904 (2008); http://dx.doi.org/10.1063/1.2960361 (3 pages) | Cited 6 times

Online Publication Date: 18 July 2008

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BiScO3–LiSbO3–PbTiO3 solid solutions with perovskite structure were prepared by the conventional mixed oxide method. X-ray diffraction showed that a change in symmetry from rhombohedral to tetragonal as the mole fraction of PbTiO3 larger than 62%. In the vicinity of the morphotropic phase boundary, the ceramics showed enhanced piezoelectric and ferroelectric properties: piezoelectric constant d33 = 545 pC/N, planar electromechanical coupling factors kp = 58%, remnant polarization Pr = 28.3 μC/cm2, and the coercive field Ec = 1.8 kV/mm, respectively. The temperature of the permittivity maximum (Tmax) increased with increasing measure of frequency, over the range of 300–340 °C, and the ceramics show the relaxor ferroelectric features.
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77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.22.Ch Permittivity (dielectric function)
77.65.Bn Piezoelectric and electrostrictive constants
77.80.-e Ferroelectricity and antiferroelectricity
64.70.K- Solid-solid transitions
77.22.Ej Polarization and depolarization
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