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

30 May 2011

Volume 98, Issue 22, Articles (22xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 98, 223101 (2011); http://dx.doi.org/10.1063/1.3595266 (3 pages)

Takahiro Ohori, Yasuhide Ohno, Kenzo Maehashi, Koichi Inoue, Yutaka Hayashi, and Kazuhiko Matsumoto
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Energy harvesting by nonlinear capacitance variation for a relaxor ferroelectric poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) terpolymer

H. Zhu, S. Pruvost, P. J. Cottinet, and D. Guyomar

Appl. Phys. Lett. 98, 222901 (2011); http://dx.doi.org/10.1063/1.3595325 (3 pages) | Cited 2 times

Online Publication Date: 31 May 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The present letter describes the investigation of the electrostatic energy harvesting through nonlinear capacitance variation caused by changes in temperature for a poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) [P(VDF-TrFE-CFE)] terpolymer. Owing to the electric tunability of the terpolymer, the harvested energy can-using an Ericsson cycle-be simulated from permittivity under a dc electric field. When going from 25 to 0 °C, it was found, from simulation, that the harvested energy increased up to 240 mJ/cm3 when raising the electric field at 80 kV/mm. Experimental measurement was also carried out, thus confirming the feasibility of electrostatic energy harvesting through low temperature Ericsson cycle.
Show PACS
77.84.Jd Polymers; organic compounds
84.60.-h Direct energy conversion and storage
77.80.Jk Relaxor ferroelectrics
77.22.Ch Permittivity (dielectric function)

Electrodes controlling phase diagrams of symmetric ferroelectric tunneling junctions or capacitors

W. J. Chen, Yue Zheng, and Biao Wang

Appl. Phys. Lett. 98, 222902 (2011); http://dx.doi.org/10.1063/1.3591163 (3 pages)

Online Publication Date: 2 June 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Electrodes controlling the “misfit strain-temperature” phase diagrams of symmetric ferroelectric tunneling junctions or capacitors have been investigated. Taking into account effect of the imperfect charge screening in electrodes, it is found that the phase diagrams can be significantly shifted with changing coefficients of electrodes. Results about the dielectric constants also indicate promising controllability of other properties for ferroelectric tunnel junction or capacitor by adjusting electrodes.
Show PACS
84.32.Tt Capacitors
85.50.-n Dielectric, ferroelectric, and piezoelectric devices

High Q-factor sapphire whispering gallery mode microwave resonator at single photon energies and millikelvin temperatures

Daniel L. Creedon, Yarema Reshitnyk, Warrick Farr, John M. Martinis, Timothy L. Duty, and Michael E. Tobar

Appl. Phys. Lett. 98, 222903 (2011); http://dx.doi.org/10.1063/1.3595942 (3 pages) | Cited 1 time

Online Publication Date: 3 June 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The microwave properties of a crystalline sapphire dielectric whispering gallery mode resonator have been measured at very low excitation strength (E/ℏω ≈ 1) and low temperatures (T ≈ 30 mK). The measurements were sensitive enough to observe saturation due to a highly detuned electron spin resonance, which limited the loss tangent of the material to about 2×10−8 measured at 13.868 and 13.259 GHz. Small power dependent frequency shifts were also measured which correspond to an added magnetic susceptibility of order 10−9. This work shows that quantum limited microwave resonators with Q-factors >108 are possible with the implementation of a sapphire whispering gallery mode system.
Show PACS
84.40.Az Waveguides, transmission lines, striplines
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close