نتایج جستجو برای: annealing in vacuum

تعداد نتایج: 16993521  

2004
Sung-O Kim Andrei Lipson

Thin film electrode production and characterization for heat cell studies are described. The objective is two-fold: maximizing excess heat production and insuring a long lifetime and electrolysis. To do this in a reproducible faction, a pre-and post-run analysis of the films was carried out using various probe techniques. In this study, various Pd-Ni thin films were manufactured using with a ma...

2011
D. P. Hickey Z. L. Bryan K. S. Jones R. G. Elliman E. E. Haller

Cross-sectional transmission electron microscopy was used to study defect formation and evolution in the !001" Ge and Si wafers implanted with 1 MeV Si+ and 40 keV Si+ at a dose of 1 !1014 cm−2. As expected, upon annealing, the #311$ extended defects form and subsequently dissolve at the projected range for nonamorphizing implants into Si. However, in Ge, no #311$ defect formation is observed f...

1999
W. C. Hughes M. L. Swanson J. C. Austin

The interaction of mercury vacancies with dopant indium atoms in Hg0,7&d0.t,Te was studied using the perturbed ‘y”/ angular correlation (PAC) technique+ Two dominant PAC signals, characterized by quadrupole interaction strengths YQ~ = 83 MHz and yoL = 91 MHz and asymmetry parameters v1 = r/2 = 0.08, were observed and attributed to one or more In-Vu, complexes. The complexes appeared after annea...

2010
Daqiang Gao Jing Zhang Jingyi Zhu Jing Qi Zhaohui Zhang Wenbo Sui Huigang Shi Desheng Xue

Room temperature ferromagnetism (RTF) is observed in pure copper oxide (CuO) nanoparticles which were prepared by precipitation method with the post-annealing in air without any ferromagnetic dopant. X-ray photoelectron spectroscopy (XPS) result indicates that the mixture valence states of Cu1+ and Cu2+ ions exist at the surface of the particles. Vacuum annealing enhances the ferromagnetism (FM...

B. Natarajan N. Jeyakumaran N. Prithivikumaran, V. Lakshmipriya

ZnO thin films with preferred orientation along the (002) plane were prepared onto the glass substrates by the sol-gel spin coating method for different post- annealing temperatures. The XRD study confirms that the thin films grown by this method have good crystalline hexagonal wurtzite structure. The optical band gap of the samples was determined from UV-visible spectra. It is found that the s...

2013
Siddhartha Mal Sudhakar Nori J. Narayan J. T. Prater D. K. Avasthi

We have introduced defects in ZnO epitaxial thin films by swift heavy Ag ion irradiation and investigated systematically their magnetic, electrical and optical properties. Oxygen annealed ZnO films are epitaxial single crystals that exhibit no long-range magnetic order. However, in this paper it is shown that room-temperature ferromagnetism (RTFM) can be introduced in a controlled manner in the...

2006
C. Davoisne Z. Djouadi H. Leroux

We present laboratory studies of the micro-structural evolution of an amorphous ferro-magnesian silicate, of olivine composition, following thermal annealing under vacuum. The amorphous silicate was prepared as a thin film on a diamond substrate. Annealing under vacuum was performed at temperatures ranging from 870 to 1020 K. After annealing the thin films were extracted from the substrate and ...

Journal: :Vacuum 2021

Electrically conductive amorphous carbon nitride (a-CN) coatings were deposited onto various substrates by pulsed vacuum-arc sputtering of a graphite cathode with simultaneous irradiation the substrate nitrogen ions. Deposition temperature was less than 60 °C. We investigated effect vacuum annealing at 600°С on elemental composition, structure, electrical and optical properties obtained films. ...

2009
Kamon Aiempanakit Pattana Rakkwamsuk

ITO thin films were deposited on glass substrate by dc magnetron sputtering without substrate heating. The effects of annealing in vacuum on the structural, optical and electrical properties were investigated. The samples of 120 nm ITO films were separately annealed at 200, 250, 300 and 350°C for 1 hour. The results showed that the increasing of the annealing temperatures improve the crystallin...

Journal: :Physical review letters 2004
Guangwen Zhou Judith C Yang

The reduction of Cu2O islands grown on Cu(100) surfaces through vacuum annealing was visualized by an in situ ultrahigh vacuum transmission electron microscope. The shrinkage of the island followed a linear decay behavior. The complete reduction of the oxide islands leads to the formation of nanoindentations on the Cu surfaces. A simple phenomenological kinetic model based on the dissociation a...

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