X-ray spectra of Ne-like Ba, La, Ce, and Pr ions

1984 ◽  
Vol 62 (12) ◽  
pp. 1924-1927 ◽  
Author(s):  
E. V. Aglitsky ◽  
P. S. Antsiferov ◽  
S. L. Mandelstam ◽  
A. M. Panin
Keyword(s):  
Image Intensifier ◽  
X Ray ◽  
Spark Plasma ◽  
First Time ◽  
Vacuum Spark

The spectra of Ne-like ions of Ba, La, Ce, and Pr in the 1.9 – 2.7 Å region, excited in the low-inductance vacuum spark plasma, have been obtained for the first time. A Johann's crystal spectrograph in combination with an image intensifier was used for recording the spectra. The 2s22p6 – 2s2p63p and 2s22p6 – 2s22p53d transitions have been identified in these ions along with the satellite lines of Na-like and Mg-like Ba–Pr ions.

X-Ray Spectra from H-, He- and Li-Like Iron Ions in a Vacuum Spark Plasma

1983 ◽  
Vol 52 (6) ◽  
pp. 1957-1968 ◽  
Author(s):  
Shigeru Morita ◽  
Junji Fujita
Keyword(s):  
Iron Ions ◽  
X Ray ◽  
Spark Plasma ◽  
Vacuum Spark

Investigation of the Temporal Evolution of X-Ray Emission From a Copper Vacuum Spark Plasma

2012 ◽  
Vol 40 (12) ◽  
pp. 3390-3394 ◽  
Author(s):  
Solmaz Saboohi ◽  
Seong Ling Yap ◽  
L. S. Chan ◽  
Chiow San Wong
Keyword(s):  
Temporal Evolution ◽  
X Ray ◽  
Spark Plasma ◽  
Vacuum Spark

scholarly journals Effect of Milling Conditions on the Microstructural Design in Aluminum Based Alloy Fabricated by SPS

Metals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1164
Author(s):  
Anton Smirnov ◽  
Ekaterina Kuznetsova ◽  
Yuri Pristinskiy ◽  
Pavel Podrabinnik ◽  
Alexander Mironov ◽  
...  
Keyword(s):  
Milling Time ◽  
Milling Process ◽  
Mechanically Alloyed ◽  
Microstructural Characteristics ◽  
X Ray ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Powder Particles ◽  
Microstructural Design ◽  
First Time

In this work, aluminum-based alloys were mechanically alloyed by various doping elements followed by spark plasma sintering. Three different mixing methods were studied. First, all elemental powders were mixed for 24 h. In the second and the third method, powders were divided into three groups, and each group was milled separately for different times. Then the obtained mixtures were grouped together and again milled for 12 and 24 h, for the M2 and M3 mixtures, respectively. The influence of milling parameters on the microstructural features of sintered samples was determined using a scanning electron microscope (SEM) equipped with an energy-dispersive X-ray spectroscopy system. The correlation observed between the milling time and microstructural evolution of the powder particles during the milling process was to determine the optimal process parameters. For the first time, the present research has demonstrated the effectiveness of the milling process for the preparation of tailored mixtures of metallic powders, enabling microstructural characteristics that could be favorable for the formation of secondary structures on the tribosurfaces.

scholarly journals Enhancement of the Mechanical and Tribological Properties of Aluminum-Based Alloys Fabricated by SPS and Alloyed with Mo and Cr

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1900
Author(s):  
Sergey N. Grigoriev ◽  
Alexander Mironov ◽  
Ekaterina Kuznetsova ◽  
Yuri Pristinskiy ◽  
Pavel Podrabinnik ◽  
...  
Keyword(s):  
Tribological Behavior ◽  
Secondary Structures ◽  
Linear Wear ◽  
X Ray ◽  
Mechanical And Tribological Properties ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Sintered Alloys ◽  
Friction Surfaces ◽  
First Time

Multicomponent aluminum-based alloys doped with chromium (Cr) and molybdenum (Mo), fabricated by spark plasma sintering (SPS), derived from a powder mixture prepared by mechanical alloying, were studied in this work. The morphology of the pristine and worn surfaces was analyzed using a scanning electron microscope equipped with an energy-dispersive X-ray spectroscopy system. The obtained alloys exhibited higher hardness (73 and 72) for the Al–Mo and Al–Cr alloys, respectively, compared to reference bronze. Besides improved hardness, SPS-sintered alloys also showed a lower value of the weight and linear wear and the highest score-resistance compared to bronze. The enhanced tribological behavior is related to the formation of secondary structures on the friction surfaces of rubbing pairs, which in turn reduce wear. For the first time, the present research has demonstrated the effectiveness of the addition of Mo and Cr for the fabrication of sintered multicomponent Al-based alloys with a tailored microstructure that induces the formation of secondary structures on the tribosurfaces due to the self-organization processes during friction.

X-ray and EUV Emission Studies of Copper Vacuum Spark Plasma

2010 ◽  
Author(s):  
L. S. Chan ◽  
M. Ghomeishi ◽  
S. L. Yap ◽  
C. S. Wong ◽  
A. K. Yahya ◽  
...  
Keyword(s):  
X Ray ◽  
Euv Emission ◽  
Spark Plasma ◽  
Emission Studies ◽  
Vacuum Spark

scholarly journals A low energy tunable pulsed X-ray source based on the pseudospark electron beam

2007 ◽  
Vol 25 (3) ◽  
pp. 497-502 ◽  
Author(s):  
C.S. Wong ◽  
H.J. Woo ◽  
S.L. Yap
Keyword(s):  
Electron Beam ◽  
Biological Sample ◽  
Production Efficiency ◽  
Line Emission ◽  
Electrical Energy ◽  
Low Energy ◽  
Characteristic Line ◽  
X Ray ◽  
Spark Plasma ◽  
Vacuum Spark

A low energy pulsed X-ray source with 17 J electrical input energy has been constructed based on the vacuum spark configuration triggered by the pseudospark electron beam. With such a low input electrical energy, the frequently studied X-ray emitting vacuum spark plasma is not obtained. Instead, this configuration gives rise to a point-like electron beam-target pulsed X-ray source at the tip of the anode. Emission of X-ray is observed during the pre-breakdown phase. The X-ray spectrum is dominated by the characteristic line emission of the anode material. The total X-ray energy emission from the source can be estimated by assuming it to be a monochromatic point source. It is found to have an X-ray production efficiency of 0.1%, giving an average X-ray dosage of 18 mGy per pulse. X-ray radiography of small biological sample is demonstrated to illustrate a potential application of the present X-ray source.

Electron density measurement of a pre-pinched vacuum spark plasma using soft X-ray titanium and vanadium emission

1989 ◽  
Vol 22 (7) ◽  
pp. 1133-1143 ◽  
Author(s):  
M Finkenthal ◽  
D Stutman ◽  
P Mandelbaum ◽  
A L Osterheld ◽  
M H Chen
Keyword(s):  
Electron Density ◽  
Density Measurement ◽  
X Ray ◽  
Spark Plasma ◽  
Vacuum Spark

An Electron Diffraction Study on Litnerized Potato Starch

1990 ◽  
Vol 48 (1) ◽  
pp. 580-581
Author(s):  
Jean-Claude Jésior ◽  
Roger Vuong ◽  
Henri Chanzy
Keyword(s):  
Electron Microscope ◽  
Electron Diffraction ◽  
Signal To Noise Ratio ◽  
Potato Starch ◽  
Image Intensifier ◽  
Electron Diffraction Study ◽  
Starch Granules ◽  
X Ray ◽  
Individual Grains ◽  
Diamond Knife

Starch is arranged in a crystalline manner within its storage granules and should thus give sharp X-ray diagrams. Unfortunately most of the common starch granules have sizes between 1 and 100μm, making them too small for an X-ray study on individual grains. There is only one instance where an oriented X-ray diagram could be obtained on one sector of an individual giant starch granule. Despite their small size, starch granules are still too thick to be studied by electron diffraction with a transmission electron microscope. The only reported study on starch ultrastructure using electron diffraction on frozen hydrated material was made on small fragments. The present study has been realized on thin sectioned granules previously litnerized to improve the signal to noise ratio.Potato starch was hydrolyzed for 10 days in 2.2N HCl at 35°C, dialyzed against water until neutrality and embedded in Nanoplast. Sectioning was achieved with a commercially available low-angle “35°” diamond knife (Diatome) after a very carefull trimming and a pre-sectioning with a classical “45°” diamond knife. Sections obtained at a final sectioning angle of 42.2° (compared with the usual 55-60°) and at a nominal thickness of 900Å were collected on a Formvar-carbon coated grid. The exact location of the starch granules in their sections was recorded by optical microscopy on a Zeiss Universal polarizing microscope (Fig. 1a). After rehydration at a relative humidity of 95% for 24 hours they were mounted on a Philips cryoholder and quench frozen in liquid nitrogen before being inserted under frozen conditions in a Philips EM 400T electron microscope equipped with a Gatan anticontaminator and a Lhesa image intensifier.

Diphosphinoazine Rhodium(I) and Iridium(I) Complexes

2006 ◽  
Vol 71 (2) ◽  
pp. 197-206 ◽  
Author(s):  
Martin Pošta ◽  
Jan Čermák ◽  
Pavel Vojtíšek ◽  
Ivana Císařová
Keyword(s):  
Rhodium Complexes ◽  
Iridium Complexes ◽  
X Ray ◽  
First Time

The first rhodium complexes of diphosphinoazines [{RhCl(1,2-η:5,6-η-CH=CHCH2CH2CH=CHCH2CH2)}2 {μ-R2PCH2C(But)=NN=C(But)CH2PR2] (R = Ph, Cy, Pri) were prepared by cleavage of the bridge in chloro(cycloocta-1,5-diene)rhodium(I) dimer, the analogous iridium(I) complexes were also prepared for the first time. The X-ray structures of isostructural rhodium and iridium complexes with bis(dicyclohexylphosphino)pinacoloneazine were determined. Diphosphinoazine ligands in the complexes remained in (Z,Z) configuration bridging two RhCl(C8H12) units.

Sign in / Sign up

Export Citation Format

Share Document