Evolution of the neutron quasielastic scattering through the ferroelectric phase transition in 93%PbZn[sub 1/3]Nb[sub 2/3]O[sub 3]--7%PbTiO[sub 3]
G.-M. Rotaru, S. N. Gvasaliya, B. Roessli, S. Kojima, S. G. Lushnikov et al.
We show that the neutron diffuse scattering in relaxor ferroelectric (1x)PZNxPT (x=0.07) consists of two components. The first component is strictly elastic but extended in q-space and grows below 600 K. The second component, which was not reported before for the (1x)PZNxPT relaxor ferroelectrics, ... [Appl. Phys. Lett. 93, 032903 (2008)] published Wed Jul 23, 2008.
Synthesis of nitrogen passivated rare-earth doped hafnia thin films and high temperature electrochemical conduction studies
S. Ramanathan, A. Karthikeyan, S. A. Govindarajan, and P. D. Kirsch
The authors report on the synthesis, electrical characterization, and high temperature electrochemical conductivity of nitrogen passivated crystalline rare-earth doped hafnia thin films with high-dielectric constant (~30) and low leakage currents. High temperature electrochemical conductivity of the ... [J. Vac. Sci. Technol. B 26, L33 (2008)] published Wed Jul 23, 2008.
Phase transition and phase stability in [110]-, [001]-, and [111]-oriented 0.68Pb(Mg[sub 1/3]Nb[sub 2/3])O[sub 3] - 0.32PbTiO[sub 3] single crystal under electric field
Zhenrong Li, Zhuo Xu, Xi Yao, and Z.-Y. Cheng
The phase transition and the phase stability in 0.68Pb(MgNb)O0.32PbTiO (PMN-0.32PT) single crystals under different electric fields were investigated over a temperature range from 20 to 200 degrees C using the dielectric property. Crystals with different orientations were used in the research. Firs ... [J. Appl. Phys. 104, 024112 (2008)] published Wed Jul 23, 2008.
Cylindrical cloak with axial permittivity/permeability spatially invariant
Yu Luo, Jingjing Zhang, Hongsheng Chen, Sheng Xi, and Bae-Ian Wu
In order to reduce the difficulties in the experimental realizations of the cloak but still keep good performance of invisibility, we proposed a perfect cylindrical invisibility cloak with spatially invariant axial material parameters. The advantage of this kind of cloak is that only rho and phi com ... [Appl. Phys. Lett. 93, 033504 (2008)] published Tue Jul 22, 2008.
Electron backscatter diffraction mapping of herringbone domain structures in tetragonal piezoelectrics
M. U. Farooq, R. Villaurrutia, I. MacLaren, T. L. Burnett, T. P. Comyn et al.
Herringbone domain structures have been mapped using electron backscatter diffraction in two tetragonal piezoelectrics: lead zirconate titanate [Pb(Zr,Ti)O] and bismuth ferritelead titanate [(PbTi)(BiFe)O]. Analysis of the domain misorientations across the band junctions shows that the structures co ... [J. Appl. Phys. 104, 024111 (2008)] published Tue Jul 22, 2008.
Effect of Joule heating on orientation of spheroidal particle in alternating electric field
Yu. Dolinsky and T. Elperin
We study the change of orientation of a spheroidal particle immersed into a liquid or gaseous host medium under the action of the alternating external electric field. It is assumed that the particle and the host medium have different electric conductivities. We show that the rate of Joule heating of ... [J. Appl. Phys. 104, 024903 (2008)] published Tue Jul 22, 2008.
Automated, simultaneous measurement of electrical properties of pyroelectric materials
J. P. Dougherty and R. J. Seymour
An automated system for measuring the pyroelectric properties of materials is described. This system can simultaneously measure pyroelectric coefficients and permittivities eliminating errors introduced in the figures of merit by temperature uncertainties. Results on deuterated triglycine fluorobery ... [Rev. Sci. Instrum. 51, 229 (2008)] published Tue Jul 22, 2008.
Measurements of the dielectric constant parallel to the surface of films
Sumio Hirota
A method for the measurement of the dielectric constant parallel to a film surface is formulated. The distribution of electric charge and capacity were calculated as a function of the geometry of electrodes and the dielectric constant of the film. A concept of residual capacity was introduced to obt ... [Rev. Sci. Instrum. 51, 1088 (2008)] published Tue Jul 22, 2008.
Electromechanical response of 1--3 piezoelectric composites: Effect of fiber shape
R. Kar-Gupta, C. Marcheselli, and T. A. Venkatesh
An analytical model and a finite element based numerical model is presented to study the effects of fiber shape on the complete elastic, dielectric, and piezoelectric properties of a general 13 long-fiber longitudinal and transverse composite with elastically anisotropic and piezoelectrically active ... [J. Appl. Phys. 104, 024105 (2008)] published Mon Jul 21, 2008.
Slim P-E hysteresis loop and anomalous dielectric response in sol-gel derived antiferroelectric PbZrO[sub 3] thin films
Jayanta Parui and S. B. Krupanidhi
Sol-gel derived PbZrO (PZ) thin films have been deposited on Pt(111)/Ti/SiO/Si substrate and according to the pseudotetragonal symmetry of PZ, the relatively preferred (110) oriented phase formation has been noticed. The room temperature P-E hysteresis loops have been observed to be slim by nature. ... [J. Appl. Phys. 104, 024107 (2008)] published Mon Jul 21, 2008.
Phase transitional behavior, microstructure, and electrical properties in Ta-modified [(K[sub 0.458]Na[sub 0.542])[sub 0.96]Li[sub 0.04]] NbO[sub 3] lead-free piezoelectric ceramics
Yunfei Chang, Zu-pei Yang, Difei Ma, Zonghuai Liu, and Zenglin Wang
Lead-free [(KNa)Li] (NbTa)O ceramics were prepared by ordinary sintering technique. The effects of Ta content on the phase transitional behavior, Raman spectrum, microstructure, and dielectric, piezoelectric, and ferroelectric properties of the ceramics were investigated. X-ray diffraction results ... [J. Appl. Phys. 104, 024109 (2008)] published Mon Jul 21, 2008.
Ultrahigh temperature Bi[sub 3]Ti[sub 0.96]Sc[sub 0.02]Ta[sub 0.02]NbO[sub 9]-based piezoelectric ceramics
Zhi-Gang Gai, Jin-Feng Wang, Wen-bin Sun, Chun-Ming Wang, Ming-Lei Zhao et al.
The effect of (Sc,Ta,Ce) doping on the properties of BiTiNbO (BTNO)-based ceramics was investigated. The cerium modification greatly improves the piezoelectric activity of Bi(TiScTa)NbO-based ceramics and significantly decreases the dielectric dissipation. The d of BiTiScTaNbO+x wt %CeO (x=0.35) wa ... [J. Appl. Phys. 104, 024106 (2008)] published Mon Jul 21, 2008.
Improved insight in charge trapping of high-k ZrO[sub 2]/SiO[sub 2] stacks by use of tunneling atomic force microscopy
A. Paskaleva, V. Yanev, M. Rommel, M. Lemberger, and A. J. Bauer
In this work, tunneling atomic force microscopy (TUNA) is used to describe the charge trapping in high-k ZrO dielectric stacks at nanoscale dimensions by analyzing the alteration of the I-V curves and the I-V hysteresis phenomena with repeated measurements (up to 100 curves) at a single spot of onl ... [J. Appl. Phys. 104, 024108 (2008)] published Mon Jul 21, 2008.
Piezoelectric disks used as metamaterial inclusions
O. Acher, M. Ledieu, A. Bardaine, and F. Levassort
The permeability of inclusions consisting of commercially available piezoelectric disks was investigated, leading to the observation of several resonances in the 100 MHz3 GHz range. This could be described through a simple analytical relation, and the inclusions were deemed attractive for manufact ... [Appl. Phys. Lett. 93, 032501 (2008)] published Mon Jul 21, 2008.
Dielectric and polarization experiments in high loss dielectrics: A word of caution
M. Maglione and M. A. Subramanian
The recent quest for improved functional materials like high permittivity dielectrics and/or multiferroics has triggered an intense wave of research. Many materials have been checked for their dielectric permittivity or their polarization state. In this report, we call for caution when samples are s ... [Appl. Phys. Lett. 93, 032902 (2008)] published Mon Jul 21, 2008.
Dynamic polarizability of the double-quadratic kink
S. E. Trullinger
We discuss a simple model of ferroelectric domain walls in terms of solitary-wave (kink) solutions of the equation of motion for the double-quadratic (DQ) chain. The response of the DQ kink to an external field is calculated and a very simple expression is obtained for the dynamic polarizability of ... [J. Math. Phys. 21, 592 (2008)] published Mon Jul 21, 2008.
Electromechanical response of 1-3 piezoelectric composites with hollow fibers
C. Marcheselli and T. A. Venkatesh
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 matr ... [Appl. Phys. Lett. 93, 022903 (2008)] published Fri Jul 18, 2008.
Size correction in ultrafast laser processing of fused silica by temporal pulse shaping
A. Mermillod-Blondin, C. Mauclair, A. Rosenfeld, J. Bonse, I. V. Hertel et al.
Laser structuring of bulk dielectric materials involves focusing through air-dielectric interfaces, which is prone to induce spherical aberrations. This elongates the energy deposition volume and restricts the processing accuracy at large focusing depths. Although spatial phase corrections are commo ... [Appl. Phys. Lett. 93, 021921 (2008)] published Fri Jul 18, 2008.
Dielectric and piezoelectric properties of (1 - x)(Bi[sub 1 - y]Li[sub y])(Sc[sub 1 - y]Sb[sub y])O[sub 3]--xPbTiO[sub 3] high-temperature relaxor ferroelectric ceramics
Yihang Jiang, Yi Zhao, Baoquan Qin, Yuzhi Jiang, Wei Shi et al.
BiScOLiSbOPbTiO 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 PbTiO larger than 62%. In the vicinity of the morphotropic phase boundary, the ce ... [Appl. Phys. Lett. 93, 022904 (2008)] published Fri Jul 18, 2008.
Structural transformation in antiferroelectric PbZrO[sub 3]-relaxor ferroelectric Pb(Ni[sub 1/3]Nb[sub 2/3])O[sub 3] solid solution system
S. Wirunchit and N. Vittayakorn
The solid solution between the antiferroelectric (AFE) PbZrO (PZ) and the relaxor ferroelectric (FE) Pb(NiNb)O (PNN) was synthesized by the columbite precursor method. The crystal structure, phase transformations, and dielectric and thermal properties of (1x)PZ-xPNN where x=0.000.30 were investigate ... [J. Appl. Phys. 104, 024103 (2008)] published Fri Jul 18, 2008.
Remanent polarization reduction with enhanced temperature in ferroelectric thin films
A. Q. Jiang and T. A. Tang
The remanent polarization reduces monotonically with the rising temperature from 295 to 430 K in Pt/IrO/Pb(ZrTi)O/IrO/Pt thin-film capacitors, although the saturation polarization of the films is nearly constant in the temperature range. Fast-pulse measurements of polarization retention shortened ... [J. Appl. Phys. 104, 024104 (2008)] published Fri Jul 18, 2008.
Structure and stability of Cd[sub 2]Nb[sub 2]O[sub 7] and Cd[sub 2]Ta[sub 2]O[sub 7] explored by ab initio calculations
Michael Fischer, Thomas Malcherek, Ulrich Bismayer, Peter Blaha, and Karlheinz Schwarz
Structural instabilities of CdNbO have been explored by all-electron ab initio calculations in the framework of density-functional theory. The calculated phonon-dispersion curve of the cubic high-temperature phase displays several modes with imaginary frequencies. A distortion according to a T mode ... [Phys. Rev. B 78, 014108 (2008)] published Thu Jul 17, 2008.
Improved temperature stability of CaTiO[sub 3]-modified [(K[sub 0.5]Na[sub 0.5])[sub 0.96]Li[sub 0.04]](Nb[sub 0.91]Sb[sub 0.05]Ta[sub 0.04])O[sub 3] lead-free piezoelectric ceramics
Jiagang Wu, Dingquan Xiao, Yuanyu Wang, Wenjuan Wu, Bin Zhang et al.
The CaTiO-modified [(KNa)Li](NbSbTa)O lead-free piezoelectric ceramics were prepared using normal sintering for improving the temperature stability of (KNa)NbO-based ceramics. The effects of the CaTiO on the temperature stability and piezoelectric properties of the ceramics were systematically studi ... [J. Appl. Phys. 104, 024102 (2008)] published Thu Jul 17, 2008.
Dielectric, ferroelectric properties, and grain growth of Ca[sub x]Ba[sub 1 - x]Nb[sub 2]O[sub 6] ceramics with tungsten-bronzes structure
Shanming Ke, Huiqing Fan, Haitao Huang, H. L. W. Chan, and Shuhui Yu
Dielectric properties, microstructures, and phase transition behaviors of alpha and beta phases of CaxBaNbO (x=0.22, 0.30, and 0.38) ceramics were investigated. All the three compositions had partially filled tungsten-bronze structure (TTB) and relatively high Curie temperatures (up to 345 degrees ... [J. Appl. Phys. 104, 024101 (2008)] published Thu Jul 17, 2008.
Possible Observation of Cycloidal Electromagnons in BiFeO[sub 3]
M. Cazayous, Y. Gallais, A. Sacuto, R. de Sousa, D. Lebeugle et al.
We unravel the magnon spectra of BiFeO by means of low-energy inelastic light scattering. We show the existence of two species of magnons corresponding to spin wave excitations in and out of the cycloidal plane. These excitations might be interpreted as electromagnon modes. The present observations ... [Phys. Rev. Lett. 101, 037601 (2008)] published Thu Jul 17, 2008.