APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

28 Jul 2008

Volume 93, Issue 4, Articles (04xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 93, 043101 (2008); http://dx.doi.org/10.1063/1.2963352 (3 pages)

Xin Fu, Jun Jiang, Wenzheng Zhang, and Jun Yuan
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Lead-free piezoelectric ceramics derived from the K0.5Na0.5NbO3–AgNbO3 solid solution system

Chao Lei and Zuo-Guang Ye

Appl. Phys. Lett. 93, 042901 (2008); http://dx.doi.org/10.1063/1.2956410 (3 pages) | Cited 28 times

Online Publication Date: 28 July 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A lead-free solid solution between potassium sodium niobate and silver niobate, (1−x)K0.5Na0.5NbO3–xAgNbO3 (KNN-AN, with x = 0–0.36), has been prepared in the form of ceramics by solid state reaction under O2 atmosphere. The crystal chemical study shows that Ag+ ion diffuses into the KNN lattices to form a solid solution of perovskite structure with x up to 0.30. The substitution of Ag+ ion for (K0.5Na0.5)+ ion results in linear decreases in the ferroelectric Curie temperature (TC), from 420 °C in KNN down to 325 °C in 0.70KNN-0.30AN, and in the tetragonal to orthorhombic phase transition temperature (TT-O), from 190 down to 150 °C. The relative density of the KNN-AN ceramics reaches 94%. The optimum piezoelectric properties are found in the ceramics of 0.82KNN-0.18AN, with a piezocoefficient d33 = 186 pC/N, an electromechanical coupling factor kp = 42.5%, and a TC = 355 °C. For the ceramics with x = 0.24, the remanent polarization reaches a maximum value of Pr = 20 μC/cm2, with a reduced coercive field Ec = 6.4 kV/cm and a TC = 340 °C. It is shown that the (1−x)KNN-xAN ceramics exhibit piezoelectric properties which are comparable or superior to the hot-pressed KNN ceramics and other KNN-based systems. In particular, the piezoelectric properties exhibit very a good thermal stability up to high temperature, which is a significant improvement from other KNN-based piezoceramics.
Show PACS
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.80.-e Ferroelectricity and antiferroelectricity
77.22.Ej Polarization and depolarization
87.80.Kc Electrochemical techniques
77.65.-j Piezoelectricity and electromechanical effects

Growth and structural characterization of (0.2)Bi(Zn1/2Ti1/2)O3–(0.8)PbTiO3 epitaxial thin films by off-axis rf sputtering

Daeyoung Kwon, Bongju Kim, P. Tong, and Bog G. Kim

Appl. Phys. Lett. 93, 042902 (2008); http://dx.doi.org/10.1063/1.2965462 (3 pages) | Cited 4 times

Online Publication Date: 28 July 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report the epitaxial growth of ferroelectric (0.2)Bi(Zn1/2Ti1/2)O3–(0.8)PbTiO3 thin films. Despite its high c/a ratio, the off-axis rf magnetron sputtering yields the epitaxial growth of high-quality thin films on (001) SrTiO3 substrates. The structural development of the film with increasing film thickness has been examined by using the synchrotron x-ray diffraction and x-ray reflectivity. The experimental results can be explained in terms of the strain relaxation process associated with the misfit dislocations between the thin film and the substrate.
Show PACS
77.80.Dj Domain structure; hysteresis
81.15.Cd Deposition by sputtering
61.05.cm X-ray reflectometry (surfaces, interfaces, films)
77.55.-g Dielectric thin films
61.72.Ff Direct observation of dislocations and other defects (etch pits, decoration, electron microscopy, x-ray topography, etc.)

Critical nature of the giant field-induced pyroelectric response in Pb(Mg1/3Nb2/3)O3–xPbTiO3 single crystals

S. I. Raevskaya, Yu. N. Zakharov, A. G. Lutokhin, A. S. Emelyanov, I. P. Raevski, M. S. Panchelyuga, V. V. Titov, and S. A. Prosandeev

Appl. Phys. Lett. 93, 042903 (2008); http://dx.doi.org/10.1063/1.2966147 (3 pages) | Cited 9 times

Online Publication Date: 30 July 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We study the E-T phase diagram and dynamical pyroelectric coefficient of an (001)-oriented flux-grown 0.8Pb(Mg1/3Nb2/3)O3–0.2PbTiO3 single crystal. We found that the highest pyroelectric coefficient can be achieved at the point having quasicritical features. These data establish a quasicritical behavior of the field-induced pyroelectric coefficients in relaxors.
Show PACS
77.70.+a Pyroelectric and electrocaloric effects
81.10.Dn Growth from solutions

Observation of negative capacitances in metal-insulator-metal devices based on a-BaTiO3:H

F. El Kamel, P. Gonon, F. Jomni, and B. Yangui

Appl. Phys. Lett. 93, 042904 (2008); http://dx.doi.org/10.1063/1.2966352 (3 pages) | Cited 9 times

Online Publication Date: 30 July 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We study capacitance dispersion in hydrogen-doped amorphous barium titanate (a-BaTiO3:H). Negative values of capacitance are observed at very low frequencies (<10 Hz). This behavior is shown to be related to proton and oxygen vacancy conductions. A qualitative model is proposed to explain negative capacitances. It involves the modification of the Schottky barrier at the metal-dielectric interface upon accumulation of mobile protons and oxygen vacancies at electrodes.
Show PACS
85.30.Tv Field effect devices
73.30.+y Surface double layers, Schottky barriers, and work functions

Large electric tunability in poly(vinylidene fluoride-trifluoroethylene) based polymers

S. G. Lu, B. Neese, B. J. Chu, Y. Wang, and Q. M. Zhang

Appl. Phys. Lett. 93, 042905 (2008); http://dx.doi.org/10.1063/1.2966934 (3 pages) | Cited 4 times

Online Publication Date: 31 July 2008

Full Text: Read Online (HTML) | Download PDF


See Also: Erratum

Show Abstract
A tunability as high as 86% was obtained at the Curie temperature in poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] 55/45 copolymers when a 100 MV/m dc electric field was applied. The tunability was much higher than that in P[VDF-TrFE-chlorofluoroethylene (CFE)] 64.3/27.6/8.1 terpolymers, which demonstrated only 49% in a 50 MV/m electric field and at the phase transition temperature. The large difference was regarded to come from the domain size change when CFE was introduced into the copolymers, and the polymer changed from normal ferroelectric for copolymers to the relaxor ferroelectric for terpolymers.
Show PACS
77.80.B- Phase transitions and Curie point
77.80.Dj Domain structure; hysteresis
77.84.Jd Polymers; organic compounds
77.22.Ch Permittivity (dielectric function)

Domain structures of ferroelectric nanotubes controlled by surface charge compensation

Jie Wang and Marc Kamlah

Appl. Phys. Lett. 93, 042906 (2008); http://dx.doi.org/10.1063/1.2966366 (3 pages) | Cited 7 times

Online Publication Date: 1 August 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Domain structures in ferroelectric nanotubes (FNTs) under different electrical boundary conditions are predicted through a phase field model. Simulation results show that domain structures are highly dependent on the compensation of polarization-induced surface charges. In order to reduce the depolarization energy, polarizations in FNTs form a vortex structure under an open-circuit boundary condition. When surface charges are compensated on the inner and outer surfaces, a multidomain structure is formed in FNTs as a result of competition between the long-range electrostatic and elastic interactions. However, a single-domain structure is energically favorable in FNTs if the upper and lower surfaces are short-circuited.
Show PACS
77.80.Dj Domain structure; hysteresis
77.22.Ej Polarization and depolarization
62.20.D- Elasticity
81.40.Jj Elasticity and anelasticity, stress-strain relations
77.84.-s Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials

X-ray diffraction study of polycrystalline BiFeO3 thin films under electric field

Seiji Nakashima, Osami Sakata, Yoshitaka Nakamura, Takeshi Kanashima, Hiroshi Funakubo, and Masanori Okuyama

Appl. Phys. Lett. 93, 042907 (2008); http://dx.doi.org/10.1063/1.2967736 (3 pages) | Cited 3 times

Online Publication Date: 1 August 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Diffraction measurements using 12.4 keV x-ray of synchrotron radiation have been performed in (001)pc- and (110)pc-oriented polycrystalline 350-nm-thick BiFeO3 thin films on a Pt/TiO2/SiO2/Si substrate under electric field in air at RT. Unipolar rectangular pulse voltages having a 150 ns width and a 804.09 ns period have been applied to BiFeO3 with a Pt top electrode. A diffraction peak of the (001)pc [(110)pc] plane shifts from 14.602° (20.520°) to 14.588 (20.505°) due to piezoelectric response when a 12 V (11 V) pulse is applied. Piezoelectric constants (d33) of (001)pc-oriented and (110)pc-oriented domains estimated from these peak shifts are 27.8 and 26.4 pm/V, respectively.
Show PACS
77.55.-g Dielectric thin films
77.84.-s Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials
77.65.-j Piezoelectricity and electromechanical effects
77.80.-e Ferroelectricity and antiferroelectricity
68.55.-a Thin film structure and morphology
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close