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

7 Nov 2011

Volume 99, Issue 19, Articles (19xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 99, 193101 (2011); http://dx.doi.org/10.1063/1.3657777 (3 pages)

Sungwook Chung, Jonathan R. Felts, Debin Wang, William P. King, and James J. De Yoreo
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Manifestation of spin-spin interaction between oxygen vacancy and magnesium in ZnMgO nanorods by electron paramagnetic resonance studies

A. Bera and D. Basak

Appl. Phys. Lett. 99, 194101 (2011); http://dx.doi.org/10.1063/1.3659297 (3 pages)

Online Publication Date: 7 November 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A strong spin-spin interaction between oxygen vacancy and Mg in ZnMgO nanorods has been manifested by electron paramagnetic resonance (EPR) studies from symmetrical hyperfine structure. Mg probably occupies Zn sites as a result of meta-stable coordination. 25Mg have nuclear spin I = 5/2 that can give rise to spin resonance with the unpaired spin S = 1/2 of VO+ in ZnO having (2n + 1) = 6 number of splitting as observed in the EPR spectra. On heating at 500 °C, the hyperfine structure disappears as Mg moves to the interstitial sites. The results are further supported by x-ray diffraction and photoluminescence results.
Show PACS
76.30.Mi Color centers and other defects
78.55.Et II-VI semiconductors
81.40.Gh Other heat and thermomechanical treatments
61.72.jd Vacancies
61.72.jj Interstitials
78.67.Qa Nanorods

Influence of the temperature dependent nonlinearities on the performance of micromechanical resonators

Hyung Kyu Lee, Bongsang Kim, Renata Melamud, Matthew A. Hopcroft, James C. Salvia, and Thomas W. Kenny

Appl. Phys. Lett. 99, 194102 (2011); http://dx.doi.org/10.1063/1.3660235 (3 pages)

Online Publication Date: 8 November 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
In micromechanical resonator-based oscillators, the temperature dependence of quality factor (Q) and coupling between amplitude and frequency cause unexpected increases in the temperature dependence of frequency. This paper presents a complete model for these interactions, confirms the model with experiments, and demonstrates an improved oscillator architecture that completely cancels these effects.
Show PACS
84.30.Ng Oscillators, pulse generators, and function generators
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices

Fractal disperse hydrogen sorption kinetics in spark discharge generated Mg/NbOx and Mg/Pd nanocomposites

Anca Anastasopol, Tobias V. Pfeiffer, Andreas Schmidt-Ott, Fokko M. Mulder, and Stephan W. H. Eijt

Appl. Phys. Lett. 99, 194103 (2011); http://dx.doi.org/10.1063/1.3659315 (3 pages) | Cited 2 times

Online Publication Date: 8 November 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Isothermal hydrogen desorption of spark discharge generated Mg/NbOx and Mg/Pd metal hydride nanocomposites is consistently described by a kinetic model based on multiple reaction rates, in contrast to the Johnson-Mehl-Avrami-Kolmogorov [M. Avrami, J. Phys. Chem. 9, 177 (1941); W. A. Johnson and R. F. Mehl, Trans. Am. Inst. Min., Metal. Eng. 135, 416 (1939); A. N. Kolmogorov, Izv. Akad. Nauk SSSR, Ser. Mat. 3, 355 (1937); F. Liu, F. Sommer, C. Bos, and E. J. Mittemeijer, Int. Mat. Rev. 52, 193 (2007)] model which is commonly applied to explain the kinetics of metal hydride transformations. The broad range of reaction rates arises from the disperse character of the particle size and the dendritic morphology of the samples. The model is expected to be generally applicable for metal hydrides which show a significant variation in particle sizes, in configuration and/or chemical composition of local surroundings of the reacting nanoparticles.
Show PACS
68.43.Nr Desorption kinetics
52.77.-j Plasma applications
82.30.-b Specific chemical reactions; reaction mechanisms
82.80.-d Chemical analysis and related physical methods of analysis

High performance bulk metallic glass/carbon nanotube composite cathodes for electron field emission

Pejman Hojati-Talemi, Mark A. Gibson, Daniel East, and George P. Simon

Appl. Phys. Lett. 99, 194104 (2011); http://dx.doi.org/10.1063/1.3659898 (3 pages) | Cited 3 times

Online Publication Date: 9 November 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report the preparation of new nanocomposites based on a combination of bulk metallic glass and carbon nanotubes for electron field emission applications. The use of bulk metallic glass as the matrix ensures high electrical and thermal conductivity, high thermal stability, and ease of processing, whilst the well dispersed carbon nanotubes act as highly efficient electron emitters. These advantages, alongside excellent electron emission properties, make these composites one of the best reported options for electron emission applications to date.
Show PACS
81.05.Bx Metals, semimetals, and alloys
81.05.ub Fullerenes and related materials
81.07.De Nanotubes
79.70.+q Field emission, ionization, evaporation, and desorption
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close