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

10 May 2010

Volume 96, Issue 19, Articles (19xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 96, 193101 (2010); http://dx.doi.org/10.1063/1.3425776 (3 pages)

J. J. Zhang, N. Hrauda, H. Groiss, A. Rastelli, J. Stangl, F. Schäffler, O. G. Schmidt, and G. Bauer
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Tunable band gap in Bi(Fe1−xMnx)O3 films

X. S. Xu, J. F. Ihlefeld, J. H. Lee, O. K. Ezekoye, E. Vlahos, R. Ramesh, V. Gopalan, X. Q. Pan, D. G. Schlom, and J. L. Musfeldt

Appl. Phys. Lett. 96, 192901 (2010); http://dx.doi.org/10.1063/1.3427499 (3 pages) | Cited 6 times

Online Publication Date: 10 May 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
In order to investigate band gap tunability in polar oxides, we measured the optical properties of a series of Bi(Fe1−xMnx)O3 thin films. The absorption response of the mixed metal solid solutions is approximately a linear combination of the characteristics of the two end members, a result that demonstrates straightforward band gap tunability in this system.
Show PACS
68.55.-a Thin film structure and morphology
78.66.-w Optical properties of specific thin films
71.20.-b Electron density of states and band structure of crystalline solids
78.20.-e Optical properties of bulk materials and thin films

Direct measurement of giant electrocaloric effect in BaTiO3 multilayer thick film structure beyond theoretical prediction

Yang Bai, Guangping Zheng, and Sanqiang Shi

Appl. Phys. Lett. 96, 192902 (2010); http://dx.doi.org/10.1063/1.3430045 (3 pages) | Cited 23 times

Online Publication Date: 12 May 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The electrocaloric (EC) effect of BaTiO3 multilayer thick film structure was investigated by direct measurement and theoretical calculation. The samples were prepared by the tape-casting method, which had 180 dielectric layers with an average thickness of 1.4 μm. The thermodynamic calculation based on the polarization-temperature curves predicted a peak heat adsorption of 0.32 J/g at 80 °C under 176 kV/cm electric field. The direct measurement via differential scanning calorimeter showed a much higher EC effect of 0.91 J/g at 80 °C under same electric field. The difference could result from the different trends of changes of electric polarization and lattice elastic energy under ultrahigh electric field.
Show PACS
77.70.+a Pyroelectric and electrocaloric effects
68.65.Ac Multilayers
77.22.Ej Polarization and depolarization
77.84.Cg PZT ceramics and other titanates
65.40.G- Other thermodynamical quantities

Piezoelectric activity of relaxor-PbTiO3 based single crystals and polycrystalline ceramics at cryogenic temperatures: Intrinsic and extrinsic contributions

Fei Li, Shujun Zhang, Zhuo Xu, Xiaoyong Wei, Jun Luo, and Thomas R. Shrout

Appl. Phys. Lett. 96, 192903 (2010); http://dx.doi.org/10.1063/1.3430059 (3 pages) | Cited 10 times

Online Publication Date: 13 May 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The piezoelectric activity in [001] poled Pb(In1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3 crystals was investigated as a function of composition and temperature. The level of intrinsic and/or extrinsic contribution to the total piezoelectric activity was analyzed using Rayleigh method. The results revealed that though 95% of the observed piezoelectric activity in rhombohedral crystals was intrinsic (lattice), the properties decreased significantly with decreasing temperature. At −150 °C, the piezoelectric response decreased by 40%–55% for the compositions close to a morphotropic phase boundary (rhombohedral-monoclinic or monoclinic-tetragonal), while decreasing only 20%–30% for the compositions in the rhombohedral region. The piezoelectric properties of Pb(Mg1/3Nb2/3)O3–PbTiO3 polycrystalline ceramics were found to decrease by 75%, showing both intrinsic and extrinsic contributions play important role in the reduction in piezoelectricity at cryogenic temperatures for ceramics.
Show PACS
77.65.-j Piezoelectricity and electromechanical effects
07.20.Mc Cryogenics; refrigerators, low-temperature detectors, and other low-temperature equipment

Effects of vacuum ultraviolet and ultraviolet irradiation on ultrathin hafnium-oxide dielectric layers on (100)Si as measured with electron-spin resonance

H. Ren, S. L. Cheng, Y. Nishi, and J. L. Shohet

Appl. Phys. Lett. 96, 192904 (2010); http://dx.doi.org/10.1063/1.3430570 (3 pages) | Cited 21 times

Online Publication Date: 14 May 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The effects of vacuum ultraviolet (VUV) (7.2 eV) and UV (4.9 eV) irradiation on hafnium-oxide dielectric layers were studied with electron-spin resonance to detect defect states. Silicon dangling-bond defects (Pb centers) and positively charged oxygen vacancies (E′ centers) were detected with g-factor fitting. VUV irradiation increases the level of Pb states, while UV decreases the level of Pb states but increases the level of E′ states significantly. Rapid thermal annealing appears to mitigate these effects. Absolute values of the defect-state concentrations are presented.
Show PACS
61.80.Ba Ultraviolet, visible, and infrared radiation effects (including laser radiation)
61.82.Ms Insulators
71.18.+y Fermi surface: calculations and measurements; effective mass, g factor
76.30.Mi Color centers and other defects
71.55.Ht Other nonmetals

Electric energy storage properties of poly(vinylidene fluoride)

Wenjing Li (李文静), Qingjie Meng (孟庆杰), Yuansuo Zheng (郑元锁), Zhicheng Zhang (张志成), Weimin Xia (夏卫民), and Zhuo Xu (徐卓)

Appl. Phys. Lett. 96, 192905 (2010); http://dx.doi.org/10.1063/1.3428656 (3 pages) | Cited 1 time

Online Publication Date: 14 May 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
High discharged energy density observed in poly(vinylidene fluoride) (PVDF) based copolymers has attracted considerable research interests in the past years. Crystalline properties exhibit great influence on their dielectric and energy storage properties. To understand how crystalline properties influence the energy storage properties of PVDF, PVDF films with three different crystal forms are investigated in this paper. It is shown that γ-PVDF is allowed to work under higher electric fields than α- and β-PVDF in the absence of phase transition in α-PVDF and early polarization saturation in β-PVDF. Consequently, γ-PVDF exhibits the highest energy density of 14 J/cm3 under 500 MV/m electric field.
Show PACS
84.60.Ve Energy storage systems, including capacitor banks
64.70.km Polymers
61.41.+e Polymers, elastomers, and plastics
77.80.-e Ferroelectricity and antiferroelectricity
77.84.Jd Polymers; organic compounds
77.22.Ej Polarization and depolarization
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close