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16 Mar 2009

Volume 94, Issue 11, Articles (11xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 94, 111101 (2009); http://dx.doi.org/10.1063/1.3097278 (3 pages)

Ling Lu, Adam Mock, Tian Yang, Min Hsiung Shih, Eui Hyun Hwang, Mahmood Bagheri, Andrew Stapleton, Stephen Farrell, John O’Brien, and P. Daniel Dapkus
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High sensitivity microwave characterization of organic molecule solutions of nanoliter volume

E. N. Shaforost, N. Klein, S. A. Vitusevich, A. A. Barannik, and N. T. Cherpak

Appl. Phys. Lett. 94, 112901 (2009); http://dx.doi.org/10.1063/1.3097015 (3 pages) | Cited 5 times

Online Publication Date: 16 March 2009

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A microwave resonator composed of a sapphire cylinder and a quartz plate with a 400 nl cavity was developed for the determination of the complex permittivity of liquids at 10 GHz. This sensor was calibrated over a wide range of values for real and imaginary parts of permittivity. The measured resonator losses induced by the liquid were found to be proportional to the dipole relaxation time of the liquid molecules, as predicted by perturbation theory. Our analysis of weight concentration and temperature dependence of the measured inverse quality factor revealed a sensitivity of about 0.1% for aqueous solutions of glucose.
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77.22.Ch Permittivity (dielectric function)
82.80.-d Chemical analysis and related physical methods of analysis
77.22.Gm Dielectric loss and relaxation
64.75.-g Phase equilibria

Magnetoelectric effect of (100−x)BaTiO3–(x)NiFe1.98O4 (x = 20–80 wt %) particulate nanocomposites

G. Sreenivasulu, V. Hari Babu, G. Markandeyulu, and B. S. Murty

Appl. Phys. Lett. 94, 112902 (2009); http://dx.doi.org/10.1063/1.3095600 (3 pages) | Cited 7 times

Online Publication Date: 16 March 2009

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The magnetoelectric (100−x)BaTiO3–(x)NiFe1.98O4 (x = 20, 40, 60, and 80 wt %) particulate composites have been prepared and the effects of size and interface are studied through microscopy measurements. Large magnetoelectric voltage coefficient (αE) values accompanied by large piezoelastic coefficient, large magnetostrictive strain coefficient, and an adequate interface contact between the magnetic and electric phases were observed in these nanocomposites. The nanocomposite with x = 40 has an αE value of 252 mV cm−1 Oe−1, which is the largest value for any particulate magnetoelectric composite, based on the available open literature.
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75.80.+q Magnetomechanical effects, magnetostriction
77.84.Lf Composite materials
81.07.Bc Nanocrystalline materials

Nd-doped BiFeO3 ceramics with antipolar order

S. Karimi, I. M. Reaney, I. Levin, and I. Sterianou

Appl. Phys. Lett. 94, 112903 (2009); http://dx.doi.org/10.1063/1.3097222 (3 pages) | Cited 34 times

Online Publication Date: 17 March 2009

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Bi1−xNdxFeO3 (0 ≤ x ≤ 0.2) ceramics have been investigated using x-ray diffraction (XRD) and electron diffraction (ED). XRD patterns for x ≤ 0.1 were consistent with rhombohedral BiFeO3, whereas those for x = 0.15 and x = 0.2 exhibited peak splitting and superlattice reflections representative of orthorhombic, antiferroelectric PbZrO3. ED for the latter samples confirmed the presence of ¼(hk0) superlattice reflections typical of a PbZrO3-like structure but additional superlattice reflections were observed at ¼(00l) yielding a √2a,2√2a,4a (where a is the pseudocubic lattice parameter) unit cell. The transition from rhombohedral BiFeO3 to the PbZrO3-like structure implies a modification from polar to antipolar behavior.
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81.05.Je Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides)
61.05.J- Electron diffraction and scattering
64.70.K- Solid-solid transitions
77.80.B- Phase transitions and Curie point
61.05.C- X-ray diffraction and scattering
61.66.Fn Inorganic compounds

Improved leakage and ferroelectric properties of Mn and Ti codoped BiFeO3 thin films

T. Kawae, Y. Terauchi, H. Tsuda, M. Kumeda, and A. Morimoto

Appl. Phys. Lett. 94, 112904 (2009); http://dx.doi.org/10.1063/1.3098408 (3 pages) | Cited 54 times

Online Publication Date: 18 March 2009

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Polycrystalline BiFeO3 (BFO), Ti-doped BFO, Mn-doped BFO, and (Mn, Ti)-codoped BFO (BFMT) thin films were fabricated on Pt/SrTiO3 (100) substrate by pulsed laser deposition. Observed leakage current behavior in those ion-doped BFO films indicated the dominance of space-charge-limited current in the high electric field region. The leakage current of the BFMT film was much reduced in relation to the other films due to the formation of deep traps. In the BFMT film, well saturated P-E hysteresis curves were observed. Remanent polarization and coercive field for maximum electric field of 2100 kV/cm were 75 μC/cm2 and 310 kV/cm, respectively.
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77.22.Ej Polarization and depolarization
81.15.Fg Pulsed laser ablation deposition
77.55.-g Dielectric thin films
77.22.Jp Dielectric breakdown and space-charge effects
77.80.Dj Domain structure; hysteresis

Quantitative evaluation of local domain patterns in [110] poled Pb(Mg1/3Nb2/3)O3–0.35PbTiO3 single crystal using a polarized Raman microprobe

Wanyin Ge, Wenliang Zhu, Yanxue Tang, and Giuseppe Pezzotti

Appl. Phys. Lett. 94, 112905 (2009); http://dx.doi.org/10.1063/1.3103274 (3 pages) | Cited 3 times

Online Publication Date: 19 March 2009

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An experimental/computational procedure was presented to quantitatively analyze by polarized Raman spectroscopy (PRS) unknown domain textures in [110] poled Pb(Mg1/3Nb2/3)O3–0.35PbTiO3 single crystal. The three-dimensional domain orientation was described in terms of three Euler angles in space, and an Euler matrix was employed to transform the axial coordinates detected at the molecular scale into the laboratory coordinate frame. Raman spectral intensity of selected bands belonging to the Ag and Eg vibrational modes varied as a function of polarization geometry and rotation angle about the [110] direction. Periodic functions, which precisely fit experimental data, could be located to describe such dependences, according to theoretical considerations. The reliability and the efficiency of PRS characterization were demonstrated and the angles of domain orientation were observed and mapped at the microscopic scale.
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77.80.Dj Domain structure; hysteresis
63.20.-e Phonons in crystal lattices
78.30.Hv Other nonmetallic inorganics
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